Bamboo had a resource that deserialised arbitrary user input without restriction. Attackers can use this vulnerability to execute Java code of their choice on systems that have a vulnerable version of Bamboo. To exploit this issue, attackers need to be able to access the Bamboo JMS port (port 54663 by default).

Affected versions:

• All versions of Bamboo from 2.3.1 before 5.9.9 (the fixed version for 5.9.x) are affected by this vulnerability.

Fix:

• Bamboo 5.10.0 is available for download from https://www.atlassian.com/software/bamboo/download.
• Bamboo 5.9.9 is available for download from https://www.atlassian.com/software/bamboo/download-archives.

For additional details see the full advisory.