Jenkins up to 2.121.1/2.132 SlaveComputer.java improper authorization

Summaryinfo

A vulnerability classified as critical was found in Jenkins up to 2.121.1/2.132. This affects an unknown function of the file SlaveComputer.java. Such manipulation leads to improper authorization. This vulnerability is listed as CVE-2018-1999004. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Jenkins up to 2.121.1/2.132 (Continuous Integration Software) and classified as critical. Affected by this issue is an unknown function of the file SlaveComputer.java. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A Improper authorization vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in SlaveComputer.java that allows attackers with Overall/Read permission to initiate agent launches, and abort in-progress agent launches.

The bug was discovered 07/18/2018. The weakness was presented 07/23/2018 (Website). The advisory is shared for download at jenkins.io. This vulnerability is handled as CVE-2018-1999004 since 07/23/2018. The exploitation is known to be easy. The attack may be launched remotely. The successful exploitation requires a simple authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

The vulnerability scanner Nessus provides a plugin with the ID 111176 (FreeBSD : jenkins -- multiple vulnerabilities (20a1881e-8a9e-11e8-bddf-d017c2ca229d)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 13217 (Jenkins Arbitrary File Access Vulnerability).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (111176). See VDB-122105, VDB-122106, VDB-122107 and VDB-122109 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Continuous Integration Software

Name

• Jenkins

Version

• 2.121.0
• 2.121.1
• 2.132

License

• open-source

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Once again VulDB remains the best source for vulnerability data.

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