CVE-2024-23917: 
JetBrains TeamCity vulnerability analysis and mitigation

CVE-2024-23917 is a critical authentication bypass vulnerability discovered in JetBrains TeamCity versions before 2023.11.3. The vulnerability was reported by Sndav Bai and Crispr Xiang from TianShu Dubhe Team and was disclosed on February 5, 2024. This security flaw affects TeamCity On-Premises servers and could allow an attacker to bypass authentication and potentially achieve Remote Code Execution (RCE) (Arctic Wolf, NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. This indicates that the vulnerability can be exploited remotely with low attack complexity, requires no privileges or user interaction, and can result in high impact across confidentiality, integrity, and availability. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function) and CWE-288 (Authentication Bypass Using an Alternate Path or Channel) (NVD).

An unauthenticated threat actor with HTTP(S) access to a TeamCity Server can exploit this vulnerability to bypass authentication and gain administrative control of the TeamCity Server. Given that TeamCity is a CI/CD platform used for software development automation, successful exploitation could potentially lead to unauthorized access to source code, build processes, and deployment systems (Arctic Wolf).

The primary mitigation is to upgrade TeamCity On-Premises installations to version 2023.11.3. For users unable to upgrade immediately, JetBrains has provided security patch plugins for different versions: one for TeamCity 2018.2+ and another for versions 2017.1, 2017.2, and 2018.1. It's worth noting that all TeamCity Cloud servers have already been patched by JetBrains (Arctic Wolf).