CyberSecBulletin
CVE-2024-6800NVD status: Analyzed

GitHub Enterprise Server: Improper Verification of Cryptographic Signature

Published Updated By the CyberSecBulletin desk

CVE-2024-6800 is a critical-severity improper verification of cryptographic signature vulnerability in GitHub Enterprise Server from GitHub, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected GitHub Enterprise Server versions: 3.13.0 through 3.13.2; 3.12.0 through 3.12.7; 3.11.0 through 3.11.13, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.53% chance of exploitation within 30 days, higher than 75% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of GitHub Enterprise Server you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on docs.github.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
GitHubGitHub Enterprise Server3.13.0 through 3.13.2; 3.12.0 through 3.12.7; 3.11.0 through 3.11.13; 3.10.0 through 3.10.15Not stated
GitHubenterprise_server3.13.0 through 3.13.2; 3.12.0 through 3.12.7; 3.11.0 through 3.11.13; 3.10.0 through 3.10.15Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 4.09.5CriticalCNA (github.com)
CVSS 3.19.8CriticalNVD

Official description

An XML signature wrapping vulnerability was present in GitHub Enterprise Server (GHES) when using SAML authentication with specific identity providers utilizing publicly exposed signed federation metadata XML. This vulnerability allowed an attacker with direct network access to GitHub Enterprise Server to forge a SAML response to provision and/or gain access to a user with site administrator privileges. Exploitation of this vulnerability would allow unauthorized access to the instance without requiring prior authentication. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.14 and was fixed in versions 3.13.3, 3.12.8, 3.11.14, and 3.10.16. This vulnerability was reported via the GitHub Bug Bounty program.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in GitHub Enterprise Server

All GitHub Enterprise Server vulnerabilities

Recent Improper Verification of Cryptographic Signature vulnerabilities

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