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AUSCERT External Security Bulletin Redistribution
ESB-2012.0873
Confluence Security Advisory 2012-09-11
13 September 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Atlassian Confluence
Publisher: Atlassian
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
Original Bulletin:
https://confluence.atlassian.com/display/DOC/Confluence+Security+Advisory+2012-09-11
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Confluence Security Advisory 2012-09-11
Added by Andrew Lui [Atlassian Technical Writer], last edited by Vitaly
Osipov [Atlassian] on Sep 12, 2012
This advisory discloses security vulnerability that we have found and fixed in
a recent version of Confluence.
Customers who have downloaded and installed Confluence should upgrade
their existing Confluence installations to fix this vulnerability.
Enterprise Hosted customers need to request an upgrade by raising a support
request. See Enterprise Hosting Upgrade Time Windows for instructions.
Atlassian OnDemand and JIRA Studio customers are not affected by any of the
issues described in this advisory.
Atlassian is committed to improving product security. The vulnerability listed
in this advisory has been discovered by Atlassian, unless noted otherwise. The
reporter may also have requested that we do not credit them.
If you have questions or concerns regarding this advisory, please raise a
support request at http://support.atlassian.com/.
In this advisory:
XSS Vulnerability
XSS Vulnerability
Severity
Atlassian rates the severity level of this vulnerability as High, according to
the scale published in Severity Levels for Security Issues. The scale allows us
to rank the severity as critical, high, medium or low.
This is an independent assessment and you should evaluate its applicability to
your own IT environment. This vulnerability is not of Critical severity.
Description
We have identified and fixed a reflected, or non-persistent, cross-site
scripting (XSS) vulnerability that affects Confluence instances, including
publicly available instances (that is, Internet-facing servers). XSS
vulnerabilities allow an attacker to embed their own JavaScript into a
Confluence page when it is viewed by the victim's browser. An attacker does not
need an account on Confluence server. A successful attack does not necessarily
modify any server content.
We recommend you to read about XSS attacks at Wikipedia, The Web Application
Security Consortium and other places on the web before considering specific
mitigations for this vulnerability.
This vulnerability affects all versions of Confluence earlier than 4.1.8. It
has been fixed in Confluence 4.1.9 and later. This issue can be tracked here:
CONF-26366 - Cross Site Scripting Vulnerability - RESOLVED
Risk Mitigation
We strongly recommend upgrading your Confluence installation to fix this
vulnerability. Please see the 'Fix' section below.
One possible workaround is to block requests to certain URLs before they reach
Confluence. HTTP GET requests to any Confluence URLs where the file name is
".vm" should be blocked. For example, if you use Apache web server to front
Confluence and your Confluence is under /wiki path, then you can set up the
following rules to block XSS attempts:
<LocationMatch ^/wiki/.*\.vm\?.* >
Deny from all
</LocationMatch>
<LocationMatch ^/wiki/.*\.vm$ >
Deny from all
</LocationMatch>
We recommend that you read the links above about how XSS attacks work before
applying any workarounds. This code is only an example.
Fix
Upgrade
The vulnerability and fix version are described in the 'Description' section
above.
We recommend that you upgrade to Confluence 4.1.9 or later, if possible. For
a full description of the latest version of Confluence, see the release notes.
You can download the latest version of Confluence from the download centre.
Patches are not available for this vulnerability for any version of Confluence.
Please see our Security Patch Policy for further information.
Our thanks to D. Niedermaier of Intrest SEC who reported the XSS vulnerability
described in this advisory. We fully support the reporting of vulnerabilities
and we appreciate it when people work with us to identify and solve the
problem.
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