RCE in GitHub
CVE-2020-10518
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.037 (88.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Github
- Github Enterprise Server — versions 2.19, 2.20, 2.21
Weakness classification (CWE)
Public proof-of-concept exploits
References
- product-cna@github.com (x_refsource_MISC, Release Notes, Vendor Advisory)
- product-cna@github.com (x_refsource_MISC, Release Notes, Vendor Advisory)
- product-cna@github.com (x_refsource_MISC, Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-10518?
- CVE-2020-10518 is a high-severity vulnerability in GitHub, classified under Command Injection. CVSS score: 8.8/10. Published 2020-08-27.
- How severe is CVE-2020-10518?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-10518 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.