Bamboo Security Advisory 2017-06-14

Incorrect permission check for deployment projects - CVE-2017-8907

Note: As of  September 2014 we are no longer issuing binary bug patches, instead we create new maintenance releases for the major versions we are backporting.

Summary of Vulnerability

This advisory discloses a critical severity security vulnerability which was introduced in version 5.0 of Bamboo. Versions of Bamboo starting with 5.0.0 before 5.15.7 (the fixed version for 5.15.x) and from 6.0.0 before 6.0.1 (the fixed version for 6.0.x) are affected by this vulnerability. 

Incorrect permission check for deployment projects (CVE-2017-8907)

Severity

Atlassian rates the severity level of this vulnerability as critical, according to the scale published in our Atlassian severity levels. The scale allows us to rank the severity as critical, high, moderate or low.

This is our assessment and you should evaluate its applicability to your own IT environment.

Description

Bamboo did not correctly check if a user creating a deployment project had the edit permission and therefore the rights to do so. An attacker who can login to Bamboo as a user without the edit permission for deployment projects is able to use this vulnerability, provided there is an existing plan with a green build, to create a deployment project and execute arbitrary code on an available Bamboo Agent. By default a local agent is enabled this means that code execution can occur on the system hosting Bamboo as the user running Bamboo.

Versions of Bamboo starting with 5.0.0 before 5.15.7 (the fixed version for 5.15.x) and from 6.0.0 before 6.0.1 (the fixed version for 6.0.x) are affected by this vulnerability. This issue can be tracked here: https://jira.atlassian.com/browse/BAM-18405

Acknowledgements

Atlassian would like to credit Iordache Cosmin (@inhibitor181) for reporting this issue to us.

Fix

We have taken the following steps to address this issue:

1. Released Bamboo version 6.0.1 that contains a fix for this issue.
2. Released Bamboo version 5.15.7 that contains a fix for this issue.

What You Need to Do

Atlassian recommends that you upgrade to the latest version. For a full description of the latest version of Bamboo, see the release notes. You can download the latest version of Bamboo from the download centre.

Upgrade Bamboo to version 6.0.3 or higher (recommended)

If you are running Bamboo 5.15.x and cannot upgrade to 6.0.3 then upgrade to version 5.15.7.

Support

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If you have questions or concerns regarding this advisory, please raise a support request at https://support.atlassian.com/.

References