CVE-2020-26233: Remote Code Execution in Git Credential Manager Core
First published: Tue Dec 08 2020(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Microsoft Git Credential Manager | <2.0.289 |
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Reference Links
- https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/
- https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspecgt
- https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76
- https://github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-beta
- https://github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-ww4j-3m76
Frequently Asked Questions
What is CVE-2020-26233?
CVE-2020-26233 is a vulnerability in Git Credential Manager Core (GCM Core) that allows for remote code execution when recursively cloning a Git repository on Windows with submodules.
What is Git Credential Manager Core (GCM Core)?
Git Credential Manager Core (GCM Core) is a secure Git credential helper built on .NET Core that runs on Windows and macOS.
How does CVE-2020-26233 impact Windows?
CVE-2020-26233 impacts Windows by allowing an attacker to execute remote code when recursively cloning a Git repository with submodules.
How can I fix the CVE-2020-26233 vulnerability?
To fix the CVE-2020-26233 vulnerability, you should update Git Credential Manager Core to version 2.0.289 or later.
Where can I find more information about CVE-2020-26233?
More information about CVE-2020-26233 can be found in the references provided: https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/, https://git-scm.com/docs/git-clone#Documentation/git-clone.txt---recurse-submodulesltpathspecgt, https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76
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