Bamboo Security Advisory 2016-01-20

Bamboo - Deserialisation resulting in remote code execution and missing authentication exposed services.

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.

Date of Advisory: 20 Jan 2016 10 AM PST(Pacific Standard Time, -8 hours)

CVE IDs: 

• CVE-2014-9757 - Deserialisation in Smack.
• CVE-2015-8360 - Deserialisation in Bamboo.
• CVE-2015-8361 - Missing authentication checks in exposed services.
  

Product: Bamboo

Affected Bamboo product versions: 

• 2.3.1 <= version < 5.9.9

Fixed Bamboo product versions:

• for 5.9.x, Bamboo 5.9.9 has been released with a fix for this issue.
• for 5.10.x, Bamboo 5.10.0 has been released with a fix for this issue.
  
  

Summary of Vulnerability

This advisory discloses multiple critical severity security vulnerabilities of which the earliest vulnerability was introduced in version 2.3.1 of Bamboo. Versions of Bamboo starting with 2.3.1 before 5.9.9 (the fixed version for 5.9.x) are vulnerable. 

Deserialisation Through Smack Resulting in Remote Code Execution Vulnerability (CVE-2014-9757)

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 a severity as critical, high, moderate, or low.

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

Description

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.

All versions of Bamboo from 2.4 before 5.9.9 (the fixed version for 5.9.x) are affected by this vulnerability. This issue can be tracked here:  BAM-17099 - Getting issue details... STATUS

Deserialisation Resulting in Remote Code Execution Vulnerability (CVE-2015-8360)

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 a severity as critical, high, moderate, or low.

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

Description

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).

All versions of Bamboo from 2.3.1 before 5.9.9 (the fixed version for 5.9.x) are affected by this vulnerability. This issue can be tracked here:  BAM-17101 - Getting issue details... STATUS

Services exposed without authentication Vulnerability (CVE-2015-8361)

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 a severity as critical, high, moderate, or low.

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

Description

Bamboo exposed services without first performing authentication checks. Attackers can use this vulnerability to extract confidential information from Bamboo, modify certain settings and manage build agents. To exploit this issue, attackers need to be able to access the Bamboo JMS port.

All versions of Bamboo from 2.4 before 5.9.9 (the fixed version for 5.9.x) are affected by this vulnerability. This issue can be tracked here:  BAM-17102 - Getting issue details... STATUS

Fix

We have taken the follow steps to address these issues:

1. Released Bamboo version 5.10.0 that contains fixes for these issues.
2. Released Bamboo version 5.9.9 that contains fixes for this issues.

What You Need to Do

Upgrade (recommended)

The vulnerabilities and fix versions are described in the Description section above. Atlassian recommends that you upgrade to the latest version. 

Upgrade Bamboo to version 5.9.9 or higher.

If you are running Bamboo 5.9.x and cannot upgrade to bamboo 5.10.x, then upgrade to version 5.9.9.

 A bug has been identified in Bamboo 5.9.9 which prevents builds using git repositories via SSH from working. See the associated bug record for workarounds:  BAM-17131 - Getting issue details... STATUS . This bug was fixed in Bamboo 5.9.10, available from the download archive. Bamboo 5.10 is not affected by this bug.

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.

Support

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

References