CVE-2022-23734
Published: 19 October 2022
Summary
CVE-2022-23734 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Github Enterprise Server. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 10.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A deserialization of untrusted data vulnerability, tracked as CWE-502, was identified in GitHub Enterprise Server that could lead to remote code execution on the SVNBridge component. The flaw affected all versions prior to 3.6 and was present in the SVNBridge's handling of serialized data received over the network.
An attacker with the ability to perform a server-side request forgery could supply controlled serialized content to the affected component, resulting in arbitrary code execution. The vulnerability carries a CVSS 3.1 score of 8.8, reflecting network attack vector, low attack complexity, and low privileges required without user interaction.
Official release notes for GitHub Enterprise Server versions 3.5.3, 3.4.6, 3.3.11, and 3.2.16 document the fixes that address the issue. The vulnerability was reported through the GitHub Bug Bounty program.
EPSS scores have remained low, with a current value of 0.0530 and a peak of 0.0651, indicating limited observed exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-28670
Vulnerability details
A deserialization of untrusted data vulnerability was identified in GitHub Enterprise Server that could potentially lead to remote code execution on the SVNBridge. To exploit this vulnerability, an attacker would need to gain access via a server-side request forgery (SSRF)…
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that would let an attacker control the data being deserialized. This vulnerability affected all versions of GitHub Enterprise Server prior to v3.6 and was fixed in versions 3.5.3, 3.4.6, 3.3.11, and 3.2.16. This vulnerability was reported via the GitHub Bug Bounty program.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing supplies malicious serialized objects, detecting unsafe deserialization and supporting corrective actions.
Evaluation of untrusted data handling (deserialization testing) reveals unsafe processing, which the required remediation process addresses.
Untrusted serialized data can be deserialized and observed inside the chamber, blocking gadget-chain exploitation outside the sandbox.
Validates or rejects untrusted serialized data before deserialization occurs.
Identifies and blocks malicious code introduced through deserialization of untrusted data at system boundaries.
Integrity verification of serialized information can detect tampering before deserialization occurs.
Provenance of associated data allows detection of untrusted sources before deserialization or processing occurs.