CVE-2020-26233 Information

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 Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N

Reference

https://github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-ww4j-3m76 https://github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-beta https://git-scm.com/docs/git-clone#Documentation/git-clone.txt—recurse-submodulesltpathspecgt https://github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3ec269e8a07ab3bc76 https://blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-execution-strikes-back/

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.3