Jenkins Script Sandbox access control

Summaryinfo

A vulnerability identified as critical has been detected in Jenkins. Affected by this vulnerability is an unknown functionality of the component Script Sandbox. The manipulation leads to access control. This vulnerability is traded as CVE-2017-1000095. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Jenkins (Continuous Integration Software) (affected version not known). It has been rated as critical. This issue affects some unknown functionality of the component Script Sandbox. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The default whitelist included the following unsafe entries: DefaultGroovyMethods.putAt(Object, String, Object); DefaultGroovyMethods.getAt(Object, String). These allowed circumventing many of the access restrictions implemented in the script sandbox by using e.g. currentBuild['rawBuild'] rather than currentBuild.rawBuild. Additionally, the following entries allowed accessing private data that would not be accessible otherwise due to script security: groovy.json.JsonOutput.toJson(Closure); groovy.json.JsonOutput.toJson(Object).

The bug was discovered 07/10/2017. The weakness was shared 10/05/2017 (Website). It is possible to read the advisory at jenkins.io. The identification of this vulnerability is CVE-2017-1000095 since 07/13/2017. The exploitation is known to be easy. The attack may be initiated remotely. A simple authentication is required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 86 days. During that time the estimated underground price was around $0-$5k.

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

The entries VDB-107448, VDB-107449, VDB-107450 and VDB-107451 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Continuous Integration Software

Name

• Jenkins

License

• open-source

CPE 2.3info

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CPE 2.2info

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