CVE-2021-21677

Jenkins Code Coverage API Plugin 1.4.0 and earlier does not apply Jenkins JEP-200 deserialization protection to Java objects it deserializes from disk, resulting in a remote code execution vulnerability.

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

• http://www.openwall.com/lists/oss-security/2021/08/31/1
• https://www.jenkins.io/security/advisory/2021-08-31/#SECURITY-2376
• http://www.openwall.com/lists/oss-security/2021/08/31/1
• https://www.jenkins.io/security/advisory/2021-08-31/#SECURITY-2376