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             AUSCERT External Security Bulletin Redistribution

                  Confluence Security Advisory 2012-09-11
                             13 September 2012


        AusCERT Security Bulletin Summary

Product:           Atlassian Confluence
Publisher:         Atlassian
Operating System:  UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade

Original Bulletin: 

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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


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.


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 ^/wiki/.*\.vm$ >
   Deny from all

We recommend that you read the links above about how XSS attacks work before 
applying any workarounds. This code is only an example.



The vulnerability and fix version are described in the 'Description' section 

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 

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