Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS01NXYzLXhoMjMtOTZnaM4ABB4b

`auth.TokenForHost` violates GitHub host security boundary when sourcing authentication token within a codespace

Summary

A security vulnerability has been identified in go-gh that could leak authentication tokens intended for GitHub hosts to non-GitHub hosts when within a codespace.

Details

go-gh sources authentication tokens from different environment variables depending on the host involved:

• GITHUB_TOKEN, GH_TOKEN for GitHub.com and ghe.com
• GITHUB_ENTERPRISE_TOKEN, GH_ENTERPRISE_TOKEN for GitHub Enterprise Server

Prior to 2.11.1, auth.TokenForHost could source a token from the GITHUB_TOKEN environment variable for a host other than GitHub.com or ghe.com when within a codespace.

In 2.11.1, auth.TokenForHost will only source a token from the GITHUB_TOKEN environment variable for GitHub.com or ghe.com hosts.

Impact

Successful exploitation could send authentication token to an unintended host.

Remediation and mitigation

1. Upgrade go-gh to 2.11.1
2. Advise extension users to regenerate authentication tokens:
   • Personal access tokens
   • GitHub CLI OAuth app
3. Advise extension users to review their personal security log and any relevant audit logs for actions associated with their account or enterprise

Permalink: https://github.com/advisories/GHSA-55v3-xh23-96gh
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS01NXYzLXhoMjMtOTZnaM4ABB4b
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 13 days ago
Updated: 8 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: 0.00044
EPSS Percentile: 0.11764

Identifiers: GHSA-55v3-xh23-96gh, CVE-2024-53859
References:

• https://github.com/cli/go-gh/security/advisories/GHSA-55v3-xh23-96gh
• https://nvd.nist.gov/vuln/detail/CVE-2024-53859
• https://docs.github.com/en/apps/using-github-apps/reviewing-and-revoking-authorization-of-github-apps#reviewing-your-authorized-github-apps
• https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/reviewing-your-security-log
• https://docs.github.com/en/enterprise-cloud@latest/admin/monitoring-activity-in-your-enterprise/reviewing-audit-logs-for-your-enterprise/identifying-audit-log-events-performed-by-an-access-token
• https://docs.github.com/en/enterprise-cloud@latest/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens
• https://github.com/cli/go-gh/blob/71770357e0cb12867d3e3e288854c0aa09d440b7/pkg/auth/auth.go#L73-L77
• https://github.com/advisories/GHSA-55v3-xh23-96gh

Repository: https://github.com/cli/go-gh
Blast Radius: 9.8

Affected Packages