Critical JetBrains TeamCity On-Premises Flaws Could Lead to Server Takeovers
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2024-23917 | In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible NVD description · AI analysis pending | 9.8 | 54% |
| — | ||
| CVE-2024-27198 +1 in the same advisory: …27199 | Authentication Bypass in JetBrains TeamCity CI/CD Server CVE-2024-27198 is an authentication bypass (CWE-288) in JetBrains TeamCity, JetBrains' self-hosted on-premises continuous integration/continuous delivery (CI/CD) server, that allows an unauthenticated attacker to circumvent login and perform administrative actions. It is triggered by sending specially crafted requests to the TeamCity web interface that dodge the authentication check, after which the attacker gains full administrator access. With admin access, an attacker can create administrative accounts, alter build configurations, plant code that runs on the server and its build agents, and reach source code, credentials, and secrets stored in the CI/CD environment, which ransomware operators have already used as an entry point. Any TeamCity deployment an attacker can reach over the network is affected, with internet-facing instances at the highest risk. Exploitation is confirmed in the wild: CISA added the flaw to the KEV catalog on 2024-03-07 with known ransomware use, and EPSS estimates a 99.9% probability of exploitation within 30 days. Do: Upgrade immediately to the patched TeamCity release per JetBrains' advisory (2023.11.4 or later fixes this vulnerability), or apply vendor mitigations or discontinue use per CISA guidance if patching is not possible. Audit instances for unexpected administrator accounts, modified build configurations, and other signs of compromise, since ransomware operators are known to be actively exploiting this bug. Restrict TeamCity's network exposure to trusted users and networks until the update is applied. | 9.8 group max | 100% | KEV ransomware |
| largetens of thousands of internet-exposed TeamCity servers (roughly 20,000–30,000 per public scans at disclosure) |
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Ravie LakshmananMar 05, 2024Vulnerability / Network Security
A new pair of security vulnerabilities have been disclosed in JetBrains TeamCity On-Premises software that could be exploited by a threat actor to take control of affected systems.
The flaws, tracked as CVE-2024-27198 (CVSS score: 9.8) and CVE-2024-27199 (CVSS score: 7.3), have been addressed in version 2023.11.4. They impact all TeamCity On-Premises versions through 2023.11.3.
“The vulnerabilities may enable an unauthenticated attacker with HTTP(S) access to a TeamCity server to bypass authentication checks and gain administrative control of that TeamCity server,” JetBrains said in an advisory released Monday.
TeamCity Cloud instances have already been patched against the two flaws. Cybersecurity firm Rapid7, which discovered and reported the issues on February 20, 2024, said CVE-2024-27198 is a case of authentication bypass that allows for a complete compromise of a susceptible server by a remote unauthenticated attacker.
“Compromising a TeamCity server allows an attacker full control over all TeamCity projects, builds, agents and artifacts, and as such is a suitable vector to position an attacker to perform a supply chain attack,” the company noted.
CVE-2024-27199, also an authentication bypass flaw, stems from a path traversal issue that can permit an unauthenticated attacker to replace the HTTPS certificate in a vulnerable TeamCity server with a certificate of their choosing via the “/app/https/settings/uploadCertificate” endpoint and even alter the port number the HTTPS service listens on.
A threat actor could leverage the vulnerability to perform a denial-of-service against the TeamCity server by either changing the HTTPS port number, or by uploading a certificate that will fail client-side validation. Alternatively, the uploaded certificate could be used for adversary-in-the-middle scenarios if it’s trusted by the clients.
“This authentication bypass allows for a limited number of authenticated endpoints to be reached without authentication,” Rapid7 said of the shortcoming.
“An unauthenticated attacker can leverage this vulnerability to both modify a limited number of system settings on the server, as well as disclose a limited amount of sensitive information from the server.”
The development comes nearly a month after JetBrains released fixes to contain another flaw (CVE-2024-23917, CVSS score: 9.8) that could also enable an unauthenticated attacker to gain administrative control of TeamCity servers.
With security vulnerabilities in JetBrains TeamCity having come under active exploitation last year by North Korean and Russian threat actors, it’s essential that users take steps to update their servers immediately.
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