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18 Jul 2024

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JetBrains TeamCity Flaws Could Lead to Server Takeovers

JetBrains TeamCity Flaws Could Lead to Server Takeovers 

Recent reports have highlighted critical vulnerabilities in the JetBrains TeamCity On-Premises software, which could potentially lead to unauthorized access and complete takeovers of servers. Identified as CVE-2024-27198 and CVE-2024-27199, these vulnerabilities pose a significant threat to the security of TeamCity servers globally.

Understanding the nature of these vulnerabilities is crucial, as they impact all versions of TeamCity On-Premises up to 2023.11.3, leaving a large number of servers susceptible to exploitation. The severity of these vulnerabilities is evident from their CVSS scores, with CVE-2024-27198 rated at 9.8 and CVE-2024-27199 at 7.3.

CVE-2024-27198 is a critical authentication bypass flaw that, if exploited, could allow remote, unauthenticated attackers to execute arbitrary code and gain full administrative control over the compromised server. This level of access enables attackers to manipulate various aspects of TeamCity, potentially leading to supply chain attacks.

On the other hand, CVE-2024-27199, although slightly less severe, remains a significant concern. This vulnerability, originating from a path traversal issue, permits unauthenticated attackers to modify specific server settings, such as uploading their own HTTPS certificate. Such actions could result in denial-of-service attacks or allow adversaries to intercept and manipulate network traffic.

In response to these disclosures, JetBrains has promptly released patches to address the identified vulnerabilities. The release of TeamCity version 2023.11.4 offers users a solution to safeguard their servers against potential exploitation. Additionally, a security patch plugin is available for customers who are unable to immediately upgrade to the latest version.

For TeamCity Cloud users, JetBrains has already taken the necessary steps to ensure the security of their hosted servers by implementing the required patches. However, for on-premises deployments, it is crucial for administrators to promptly apply the available patches.

Recommendations for Administrators and Users

To mitigate the risks associated with these vulnerabilities, administrators and users should consider the following precautions:

1. Update to the Latest Version: It is important to promptly update TeamCity On-Premises servers to version 2023.11.4 or a newer version to eliminate any security vulnerabilities.

2. Implement Hardening Measures: Regularly review and strengthen security configurations for all applications, databases, servers, and network devices to minimize the potential for attacks.

3. Backup and Recovery: Maintain regular backups of critical data and ensure they are stored offline or on a separate network to minimize the impact of any potential breaches.

4. Password Security: Enforce the use of unique and strong passwords for all accounts. Additionally, consider implementing Multi-Factor Authentication (MFA) whenever possible to enhance authentication security.

5. Keep Systems Updated: Regularly update antivirus signatures, operating systems, and third-party applications to address known vulnerabilities and enhance overall system security.


The discovery of critical vulnerabilities in JetBrains TeamCity On-Premises software highlights the ongoing threat posed by security flaws in widely-used applications. By promptly addressing these vulnerabilities and implementing robust security measures, organizations can protect their infrastructure from potential threats and ensure the integrity of their CI/CD pipelines. As security threats continue to evolve, it is crucial to remain vigilant and proactive in addressing security concerns to maintain a secure IT environment.

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