Vulnerability in Microsoft Git-Credential-Manager-Core
CVE-2020-26233
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.060 (93.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.059 · newest: 0.060 · change: +0.000
Affected products
- Microsoft Git-Credential-Manager-Core — versions <= 2.0.280
- Microsoft Git Credential Manager Core
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/microsoft/Git-Credential-Manager-Core/security/advisories/GHSA-2gq7-… (Third Party Advisory)
- git-scm.com/docs/git-clone (Third Party Advisory)
- github.com/microsoft/Git-Credential-Manager-Core/releases/tag/v2.0.289-beta (Third Party Advisory, Release Notes)
- github.com/microsoft/Git-Credential-Manager-Core/commit/61c0388e064babb3b4e60d3… (Patch, Third Party Advisory)
- blog.blazeinfosec.com/attack-of-the-clones-2-git-command-client-remote-code-exe… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26233?
- CVE-2020-26233 is a high-severity vulnerability in Microsoft Git-Credential-Manager-Core, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 7.3/10. Published 2020-12-08.
- How severe is CVE-2020-26233?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2020-26233 known to be exploited?
- 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.