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From:David Black <dblack_(at)_atlassian.com>
Date:26 октября 2015 г.
Subject:CVE-2015-6576: Bamboo - Deserialisation resulting in remote code execution



Note: the current version of this advisory can be found at
https://confluence.atlassian.com/x/Hw7RLg .


CVE ID: CVE-2015-6576
Product: Bamboo.
Affected Bamboo product versions:
* 2.2 <= version < 5.8.5
* 5.9.0 <= version < 5.9.7

Summary:
This advisory discloses a critical severity security vulnerability
that was introduced in version 2.2 of Bamboo. Versions of Bamboo
starting with 2.2 before 5.8.5 (the fixed version for 5.8.x) and from
5.9.0 before 5.9.7 (the fixed version for 5.9.x) are vulnerable.

Atlassian Cloud instances have already been upgraded to a version of
Bamboo which does not have the issue described on this page.

Customers who have upgraded Bamboo to version 5.8.5 or version 5.9.7
are not affected.

Customers who have downloaded and installed Bamboo >= 2.2 less than
5.8.5 (the fixed version for 5.8.x):
 Please upgrade your Bamboo installations immediately to fix this
vulnerability.

Customers who have downloaded and installed Bamboo >= 5.9.0 less than
5.9.7 (the fixed version for 5.9.x):
 Please upgrade your Bamboo installations immediately to fix this
vulnerability.

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
web interface.

All versions of Bamboo from 2.2 before 5.8.5 (the fixed version for
5.8.x) and from 5.9.0 before 5.9.7 (the fixed version for 5.9.x) are
affected by this vulnerability. This issue can be tracked here:
https://jira.atlassian.com/browse/BAM-16439

Acknowledgements:
We would like to credit Matthias Kaiser of Code White for reporting
this issue to Atlassian.

Fix:
We have taken the follow steps to address this issue:
1. Released Bamboo version 5.9.7 that contains a fix for this issue.
2. Released Bamboo version 5.8.5 that contains a fix for this issue.

Remediation:
Upgrade Bamboo to version 5.9.7 or higher.

If you are running Bamboo 5.8.x and cannot upgrade to bamboo 5.9.X,
then upgrade to version 5.8.5.

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.


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

--
David Black / Security Engineer.

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