What’s Vulnerable › Vulnerabilities

CVE-2017-18365

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 21.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-03-28 · updated 2026-06-17
• Weakness: CWE-502

Description

The Management Console in GitHub Enterprise 2.8.x before 2.8.7 has a deserialization issue that allows unauthenticated remote attackers to execute arbitrary code. This occurs because the enterprise session secret is always the same, and can be found in the product's source code. By sending a crafted cookie signed with this secret, one can call Marshal.load with arbitrary data, which is a problem because the Marshal data format allows Ruby objects.

Affected products

• Github: from 2.8.0 before 2.8.7; 2.8.7 — fixed in 2.8.7

How to fix

Upgrade to a fixed version: Github 2.8.7. Check the vendor advisory for mitigations.

References

• https://enterprise.github.com/releases/2.8.7/notes
• https://www.exablue.de/blog/2017-03-15-github-enterprise-remote-code-execution.html
• https://enterprise.github.com/releases/2.8.7/notes
• https://www.exablue.de/blog/2017-03-15-github-enterprise-remote-code-execution.html

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