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 2020-12-08 20:15:15
Updated 2021-02-18 14:39:02
Source GitHub, Inc.
View at NVD,   CVE.org

Products affected by CVE-2020-26233

Exploit prediction scoring system (EPSS) score for CVE-2020-26233

0.14%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 50 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-26233

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
3.6
LOW AV:N/AC:H/Au:S/C:P/I:P/A:N
3.9
4.9
NIST
7.3
HIGH CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
1.0
5.8
NIST
7.3
HIGH CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
1.0
5.8
GitHub, Inc.

CWE ids for CVE-2020-26233

  • The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.
    Assigned by:
    • nvd@nist.gov (Secondary)
    • security-advisories@github.com (Primary)
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