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AUSCERT External Security Bulletin Redistribution
ESB-2022.1284.4
CVE-2016-10750 - Hazelcast vulnerable to remote code execution
8 June 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Atlassian Products
Publisher: Atlassian
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Resolution: Patch/Upgrade
CVE Names: CVE-2022-26133 CVE-2016-10750
Original Bulletin:
https://confluence.atlassian.com/security/multiple-products-security-advisory-hazelcast-vulnerable-to-remote-code-execution-cve-2016-10750-1116292387.html
Comment: CVSS (Max): 8.1* CVE-2016-10750 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
* Not all CVSS available when published
Revision History: June 8 2022: Significant updates to Vendor advisory
April 11 2022: Vendor added CVE-2022-26133 affecting Bitbucket Data Center
March 25 2022: Updated Mail Subject
March 25 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
+-------------------+---------------------------------------------------------+
| Summary |CVE-2016-10750 - Hazelcast vulnerable to remote code |
| |execution |
+-------------------+---------------------------------------------------------+
| Advisory Release |24 Mar 2022 23:00 UTC (Coordinated Universal Time, +0 |
| Date |hours) |
+-------------------+---------------------------------------------------------+
| | o Bitbucket Data Center |
| Affected Products | |
| | o Confluence Data Center |
+-------------------+---------------------------------------------------------+
| CVE ID |CVE-2016-10750 (Confluence Data Center) |
| |CVE-2022-26133 (Bitbucket Data Center) |
+-------------------+---------------------------------------------------------+
This advisory has been updated since its initial publication.
06 Jun 2022 07:30 UTC (Coordinated Universal Time, +0 hours)
o Updated the fixed version of the Confluence DC
08 Apr 2022 23:00 UTC (Coordinated Universal Time, +0 hours)
o Assigned CVE-2022-26133 to the Bitbucket Data Center vulnerability, which
was determined to be similar to CVE-2016-10750 yet slightly different and
specific to Bitbucket
o Note the new CVE assignment for Bitbucket does not change any other
information in this advisory. The existing list of affected and fixed
versions remains unchanged and accurate
o Updated the Summary of Vulnerability section accordingly
28 Mar 2022 17:00 UTC (Coordinated Universal Time, +0 hours)
o Added a "Severity" section which was accidentally omitted from the initial
publication.
Summary of Vulnerability
Multiple Atlassian products use the third-party software Hazelcast, which is
vulnerable to Java deserialization attacks. Hazelcast is used by these products
when they're configured to run as a cluster. A remote, unauthenticated attacker
can exploit this vulnerability by sending a specially crafted request,
resulting in arbitrary code execution.
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.
Affected Bitbucket Data Center Versions
o Bitbucket Server is not affected.
o Bitbucket Cloud is not affected.
Both single and multi-node installations of Bitbucket Data Center are affected.
Enabling or disabling clustering does not affect whether or not the application
is vulnerable.
The following versions of Bitbucket Data Center are affected:
o All 5.x versions >= 5.14.x
o All 6.x versions
o All 7.x versions < 7.6.14
o All versions 7.7.x through 7.16.x
o 7.17.x < 7.17.6
o 7.18.x < 7.18.4
o 7.19.x < 7.19.4
o 7.20.0
Fixed Bitbucket Data Center Versions
The following versions of Bitbucket Data Center fix this vulnerability:
o 7.6.14
o 7.17.6
o 7.18.4
o 7.19.4
o 7.20.1
o 7.21.0
Find the versions above on our downloads page and use the steps outlined in the
Bitbucket upgrade guide to complete the upgrade.
If you are unable to install a fixed version, refer to the "Workaround" section
below.
Affected Confluence Data Center Versions
o Confluence Data Center instances that are not installed as a cluster are
not affected.
o Confluence Server is not affected.
o Confluence Cloud is not affected.
Confluence Data Center is only affected when it is installed as a cluster. To
verify whether a cluster installation is being used, check the
confluence.cfg.xml file in the Confluence home directory. If the following line
is present, it has been installed as a cluster:
<property name="confluence.cluster">true</property>
If the line is not present or if the value is set to false instead of true, it
has not been installed as a cluster.
The following versions of Confluence Data Center are affected when clustering
is enabled:
o All versions 5.6.x and later
Fixed Confluence Data Center Versions
The following versions of Confluence Data Center fix this vulnerability:
o 7.4.17
o 7.13.7
o 7.14.3
o 7.15.2
o 7.16.4
o 7.17.4
o 7.18.1
This issue can be tracked here:
CONFSERVER-79017 - Getting issue details... STATUS
Atlassian recommends that you upgrade to the latest Long Term Support release.
For a full description of the latest version, see the Confluence Server and
Data Center Release Notes. You can download the latest version from the
download centre.
Note: If you run Confluence in a cluster, you will not be able to upgrade to
these versions without downtime, also known as a rolling upgrade. Follow the
steps in Upgrading Confluence Data Center.
Workaround
Restrict access to the Hazelcast port by using a firewall or other network
access controls. The port only needs to be accessible by other nodes in the
Bitbucket or Confluence cluster.
For Bitbucket Data Center, Hazelcast uses TCP port 5701 by default.
For Confluence Data Center, Hazelcast uses both TCP ports 5701 and 5801 by
default.
Acknowledgements
We would like to acknowledge Benny Jacob (SnowyOwl) for reporting this
vulnerability to Atlassian's bug bounty program.
References
o BSERV-13173 - Getting issue details... STATUS
o CONFSERVER-78179 - Getting issue details... STATUS
Last modified on Jun 6, 2022
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