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.

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

EPSS: 0.212 (97.3th percentile) — read the EPSS interpretation.

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.

Affected products

Github — versions 2.8.7
N/a — versions n/a

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

rapid7/metasploit-framework

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, 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.