CVE-2018-1000861

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

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://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html
• http://www.securityfocus.com/bid/106176
• https://access.redhat.com/errata/RHBA-2019:0024
• https://jenkins.io/security/advisory/2018-12-05/#SECURITY-595
• http://packetstormsecurity.com/files/166778/Jenkins-Remote-Code-Execution.html
• http://www.securityfocus.com/bid/106176
• https://access.redhat.com/errata/RHBA-2019:0024
• https://jenkins.io/security/advisory/2018-12-05/#SECURITY-595