CVE-2022-23734

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) 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.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• https://docs.github.com/en/enterprise-server%403.2/admin/release-notes#3.2.16
• https://docs.github.com/en/enterprise-server%403.3/admin/release-notes#3.3.11
• https://docs.github.com/en/enterprise-server%403.4/admin/release-notes#3.4.6
• https://docs.github.com/en/enterprise-server%403.5/admin/release-notes#3.5.3
• https://docs.github.com/en/enterprise-server%403.2/admin/release-notes#3.2.16
• https://docs.github.com/en/enterprise-server%403.3/admin/release-notes#3.3.11
• https://docs.github.com/en/enterprise-server%403.4/admin/release-notes#3.4.6
• https://docs.github.com/en/enterprise-server%403.5/admin/release-notes#3.5.3