Vulnerability · Published Dec 8, 2020 · Assigned by GitHub_M
CVE-2020-26233Remote Code Execution in Git Credential Manager Core
High 7.3
In plain English
A high-severity security flaw in Git-Credential-Manager-Core from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.0% (higher than 93% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| microsoft | Git-Credential-Manager-Core | <= 2.0.280 |
Weakness: CWE-706 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
References
- https://github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-ww4j-3m76 x_refsource_CONFIRM
- https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspecgt x_refsource_MISC
- https://github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-beta x_refsource_MISC
- https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76 x_refsource_MISC
- https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/ x_refsource_MISC