Deserialization in GitHub
CVE-2017-18365
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.212 (97.5th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.212 · newest: 0.212 · change: 0.000
Affected products
- GitHub — versions 2.8.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.exablue.de/blog/2017-03-15-github-enterprise-remote-code-execution.html (Exploit, Third Party Advisory)
- enterprise.github.com/releases/2.8.7/notes (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-18365?
- CVE-2017-18365 is a critical-severity vulnerability in GitHub, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2019-03-28.
- How severe is CVE-2017-18365?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-18365 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.