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CVE-2020-10518

8.8 · HIGH

A remote code execution vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site.

Published Aug 27, 2020CWE-77EPSS 3.70%

Overview

CVE-2020-10518 is a high-severity vulnerability. It was published on August 27, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A remote code execution vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration of the underlying parsers used by GitHub Pages were not sufficiently restricted and made it possible to execute commands on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 2.22 and was fixed in 2.21.6, 2.20.15, and 2.19.21. The underlying issues contributing to this vulnerability were identified both internally and through the GitHub Security Bug Bounty program.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubenterprise.github.com/releases/2.19.21/notesGitHubenterprise.github.com/releases/2.20.15/notesGitHubenterprise.github.com/releases/2.21.6/notesGitHubenterprise.github.com/releases/2.19.21/notesGitHubenterprise.github.com/releases/2.20.15/notesGitHubenterprise.github.com/releases/2.21.6/notes

How CyberStrike helps

Frequently asked questions

What is CVE-2020-10518?

CVE-2020-10518 is a high-severity vulnerability. It was published on August 27, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2020-10518?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2020-10518?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-10518?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-10518 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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