On September 20, 2023, JetBrains disclosed CVE-2023-42793, a critical authentication bypass vulnerability in on-premises instances of their TeamCity CI/CD server. Successful exploitation of CVE-2023-42793 allows an unauthenticated attacker with HTTP(S) access to a TeamCity server to perform a remote code execution attack and gain administrative control of the server — making the vulnerability a potential supply chain attack vector.
As of September 25, 2023, Rapid7 is not aware of in-the-wild exploitation of CVE-2023-42793, and no public exploit code is available. We still recommend, however, that TeamCity customers upgrade to the fixed version (2023.05.4) immediately, or else apply one of the vulnerability-specific patches outlined in the JetBrains advisory. Customers who are unable to upgrade or apply a targeted fix for CVE-2023-42793 should consider taking the server offline until the vulnerability can be mitigated.
Affected Products
CVE-2023-42793 affects all on-prem versions of JetBrains TeamCity prior to 2023.05.4. TeamCity Cloud is not affected, and according to JetBrains, TeamCity Cloud servers have already been upgraded to the latest version.
Mitigation Guidance
JetBrains notes in their advisory that vulnerability-specific security patch plugins (i.e., hot fixes) are available as a temporary workaround for TeamCity customers who are not able to upgrade to 2023.05.4. The plugins are supported on TeamCity 8.0+ and will mitigate CVE-2023-42793 specifically, but will not address any other security issues or bugs that are included in the full 2023.05.4 upgrade.
Security patch plugins:
TeamCity 2018.2 to 2023.05.3TeamCity 8.0 to 2018.1 ..
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