Security News > 2023 > October > Ransomware gangs now exploiting critical TeamCity RCE flaw
Ransomware gangs are now targeting a recently patched critical vulnerability in JetBrains' TeamCity continuous integration and deployment server.
The flaw allows unauthenticated attackers to gain remote code execution after successfully exploiting an authentication bypass weakness in low-complexity attacks that don't require user interaction.
Swiss security firm Sonar published full technical details one week after JetBrains addressed the critical security issue with the release of TeamCity 2023.05.4 on September 21st. "This enables attackers not only to steal source code but also stored service secrets and private keys," Sonar vulnerability researcher Stefan Schiller explained.
Just days after Sonar published their blog post, multiple attackers started exploiting this critical auth bypass flaw, according to threat intelligence companies GreyNoise and PRODAFT. PRODAFT said that multiple ransomware operations have already added CVE-2023-42793 exploits to their arsenal and are using them to breach vulnerable TeamCity servers.
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Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2023-09-19 | CVE-2023-42793 | Authentication Bypass Using an Alternate Path or Channel vulnerability in Jetbrains Teamcity In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible | 9.8 |