June 2017 - Bamboo - Critical Security Advisory

This email refers to the advisory found at
https://confluence.atlassian.com/x/KgwUNg .


CVE ID:

* CVE-2017-8907.


Product: Bamboo.

Affected Bamboo product versions:

5.0.0 <= version < 5.15.7
6.0.0 <= version < 6.0.1


Fixed Bamboo product versions:

* for 5.15.x, Bamboo 5.15.7 has been released with a fix for this issue.
* for 6.0.x, Bamboo 6.0.1 has been released with a fix for this issue.


Summary:
This advisory discloses a critical severity security vulnerability
that was introduced in version 5.0.0 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.

Cloud instances have already been upgraded to a version of Bamboo that
does not have the issue described in this email.

Customers who have upgraded Bamboo to version 5.15.7 or 6.0.1 are not affected.

Customers who have downloaded and installed Bamboo >= 5.0.0 but less
than 5.15.7 (the fixed version for 5.15.x) or who have downloaded and
installed Bamboo >= 6.0.0 but less than 6.0.1 (the fixed version for
6.0.x) please upgrade your Bamboo installations immediately to fix
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
at: https://jira.atlassian.com/browse/BAM-18405 .


Fix:

To address this issue, we've released the following versions containing a fix:

* Bamboo version 5.15.7
* Bamboo version 6.0.1

Remediation:

Upgrade Bamboo to version 6.0.1 or higher.

The vulnerabilities and fix versions are described above. If affected,
you should upgrade to the latest version immediately.

If you are running Bamboo 5.15.x and cannot upgrade to 6.0.1, upgrade
to version 5.15.7.


For a full description of the latest version of Bamboo, see
the release notes found at
https://confluence.atlassian.com/display/BAMBOO/Bamboo+releases. You
can download the latest version of Bamboo from the download centre
found at https://www.atlassian.com/software/bamboo/download.

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

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