Bamboo up to 6.0.4/6.1.3/6.2.0 REST Endpoint YAML File access control

Summaryinfo

A vulnerability classified as critical has been found in Bamboo up to 6.0.4/6.1.3/6.2.0. Impacted is an unknown function of the component REST Endpoint. This manipulation as part of YAML File causes access control. This vulnerability is tracked as CVE-2017-9514. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Bamboo up to 6.0.4/6.1.3/6.2.0. It has been declared as critical. Affected by this vulnerability is some unknown processing of the component REST Endpoint. The manipulation as part of a YAML File leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Bamboo before 6.0.5, 6.1.x before 6.1.4, and 6.2.x before 6.2.1 had a REST endpoint that parsed a YAML file and did not sufficiently restrict which classes could be loaded. An attacker who can log in to Bamboo as a user is able to exploit this vulnerability to execute Java code of their choice on systems that have vulnerable versions of Bamboo.

The bug was discovered 10/11/2017. The weakness was disclosed 10/12/2017 (Website). It is possible to read the advisory at confluence.atlassian.com. This vulnerability is known as CVE-2017-9514 since 06/07/2017. The attack can be launched remotely. Required for exploitation is a single authentication. 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 1 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 11881 (Atlassian Bamboo YAML Deserialization Remote Code Execution Vulnerability).

Upgrading to version 6.0.5, 6.1.4 or 6.2.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 101269†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Bamboo

Version

• 6.0
• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.1
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.2.0

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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