Bamboo used an old version of the Smack XMPP library that deserialises messages received from XMPP. Attackers can use this vulnerability to execute Java code of their choice on systems that have a vulnerable version of Bamboo if a XMPP connection has been configured. To exploit this issue, Bamboo attackers need to be able to modify XMPP messages destined to Bamboo from a configured XMPP server.

Affected versions:

• All versions of Bamboo from 2.4 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.