CVE-2020-26233
If a malicious git.exe executable is present in the top-level repository then this binary will be started by Git Credential Manager Core when attempting to read configuration, and not git.exe as found on the %PATH%.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Git Credential Manager Core (GCM Core) is a secure Git credential helper built on .NET Core that runs on Windows and macOS. In Git Credential Manager Core before version 2.0.289, when recursively cloning a Git repository on Windows with submodules, Git will first clone the top-level repository and then recursively clone all submodules by starting new Git processes from the top-level working directory. If a malicious git.exe executable is present in the top-level repository then this binary will be started by Git Credential Manager Core when attempting to read configuration, and not git.exe as found on the %PATH%. This only affects GCM Core on Windows, not macOS or Linux-based distributions. GCM Core version 2.0.289 contains the fix for this vulnerability, and is available from the project's GitHub releases page. GCM Core 2.0.289 is also bundled in the latest Git for Windows release; version 2.29.2(3). As a workaround, users should avoid recursively cloning untrusted repositories with the --recurse-submodules option.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
- EPSS
- 5.99% probability · 93th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-706
- Affected
- microsoft/git credential manager core
- Source
- security-advisories@github.com
References
- https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/Exploit, Third Party Advisory
- https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspecgtThird Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76Patch, Third Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-betaRelease Notes, Third Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-ww4j-3m76Third Party Advisory
- https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/Exploit, Third Party Advisory
- https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspecgtThird Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76Patch, Third Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-betaRelease Notes, Third Party Advisory
- https://github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-ww4j-3m76Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.