Jenkins up to 2.120/LTS 2.107.2 Security Subsystem FilePath.java path traversal

Summaryinfo

A vulnerability described as critical has been identified in Jenkins up to 2.120/LTS 2.107.2. This affects an unknown function of the file FilePath.java of the component Security Subsystem. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2018-1000194. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Jenkins up to 2.120/LTS 2.107.2 (Continuous Integration Software) and classified as critical. This vulnerability affects an unknown code block of the file FilePath.java of the component Security Subsystem. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A path traversal vulnerability exists in Jenkins 2.120 and older, LTS 2.107.2 and older in FilePath.java, SoloFilePathFilter.java that allows malicious agents to read and write arbitrary files on the Jenkins master, bypassing the agent-to-master security subsystem protection.

The bug was discovered 05/09/2018. The weakness was shared 06/05/2018 (Website). The advisory is shared for download at jenkins.io. This vulnerability was named CVE-2018-1000194 since 06/05/2018. The exploitation appears to be easy. The attack can be initiated remotely. The requirement for exploitation is a single authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability was handled as a non-public zero-day exploit for at least 27 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13416 (Jenkins Multiple Security Vulnerabilities (Jenkins Security Advisory 2018-05-09)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entries VDB-118982, VDB-118983, VDB-118985 and VDB-118986 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Continuous Integration Software

Name

• Jenkins

Version

• 2.120
• LTS 2.107.0
• LTS 2.107.1
• LTS 2.107.2

License

• open-source

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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