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Security Advisories: GSA_kwCzR0hTQS1qd2NtLTlnMzktcG1jd84ABB4c

Recursive repository cloning can leak authentication tokens to non-GitHub submodule hosts

Summary

A security vulnerability has been identified in the GitHub CLI that could leak authentication tokens when cloning repositories containing git submodules hosted outside of GitHub.com and ghe.com.

Details

This vulnerability stems from several gh commands used to clone a repository with submodules from a non-GitHub host including gh repo clone, gh repo fork, gh pr checkout. These GitHub CLI commands invoke git with instructions to retrieve authentication tokens using the credential.helper configuration variable for any host encountered.

Prior to 2.63.0, hosts other than GitHub.com and ghe.com are treated as GitHub Enterprise Server hosts and have tokens sourced from the following environment variables before falling back to host-specific tokens stored within system-specific secured storage:

GITHUB_ENTERPRISE_TOKEN
GH_ENTERPRISE_TOKEN
GITHUB_TOKEN when CODESPACES environment variable is set

The result being git sending authentication tokens when cloning submodules.

In 2.63.0, these GitHub CLI commands will limit the hosts for which gh acts as a credential helper to source authentication tokens. Additionally, GITHUB_TOKEN will only be used for GitHub.com and ghe.com.

Impact

Successful exploitation could lead to a third-party using leaked authentication tokens to access privileged resources.

Remediation and mitigation

Upgrade gh to 2.63.0
Revoke authentication tokens used with the GitHub CLI:
- Personal access tokens
- GitHub CLI OAuth app
Review your personal security log and any relevant audit logs for actions associated with your account or enterprise

Permalink: https://github.com/advisories/GHSA-jwcm-9g39-pmcw
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qd2NtLTlnMzktcG1jd84ABB4c
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 20 days ago
Updated: 15 days ago

CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

EPSS Percentage: 0.00043
EPSS Percentile: 0.10511

Identifiers: GHSA-jwcm-9g39-pmcw, CVE-2024-53858
References:

Repository: https://github.com/cli/cli
Blast Radius: 9.1

Affected Packages

go:github.com/cli/cli/v2

Dependent packages: 196
Dependent repositories: 25
Downloads:
Affected Version Ranges: <= 2.62.0
Fixed in: 2.63.0
All affected versions: 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.5.1, 2.5.2, 2.6.0, 2.7.0, 2.8.0, 2.9.0, 2.10.0, 2.10.1, 2.11.0, 2.11.1, 2.11.2, 2.11.3, 2.12.0, 2.12.1, 2.13.0, 2.14.0, 2.14.1, 2.14.2, 2.14.3, 2.14.4, 2.14.5, 2.14.6, 2.14.7, 2.15.0, 2.16.0, 2.16.1, 2.17.0, 2.18.0, 2.18.1, 2.19.0, 2.20.0, 2.20.1, 2.20.2, 2.21.0, 2.21.1, 2.21.2, 2.22.0, 2.22.1, 2.23.0, 2.24.0, 2.24.1, 2.24.2, 2.24.3, 2.25.0, 2.25.1, 2.26.0, 2.26.1, 2.27.0, 2.28.0, 2.29.0, 2.30.0, 2.31.0, 2.32.0, 2.32.1, 2.33.0, 2.34.0, 2.35.0, 2.36.0, 2.37.0, 2.38.0, 2.39.0, 2.39.1, 2.39.2, 2.40.0, 2.40.1, 2.41.0, 2.42.0, 2.42.1, 2.43.0, 2.43.1, 2.44.0, 2.44.1, 2.45.0, 2.46.0, 2.47.0, 2.48.0, 2.49.0, 2.49.1, 2.49.2, 2.50.0, 2.51.0, 2.52.0, 2.53.0, 2.54.0, 2.55.0, 2.56.0, 2.57.0, 2.58.0, 2.59.0, 2.60.0, 2.60.1, 2.61.0, 2.62.0
All unaffected versions: 2.63.0, 2.63.1, 2.63.2