Confluence Security Advisory 2007-12-14

In this advisory:

XSS Vulnerability in Configure RSS Feed Action

Severity

Atlassian rates this vulnerability as high, according to the scale published in Confluence Security. The scale allows us to rank a vulnerability as critical, high, moderate or low.

Risk Assessment

We have identified and fixed a security flaw which may affect Confluence instances in a public environment. This flaw is an XSS (cross-site scripting) vulnerability in a Confluence action, which potentially allows a malicious user (hacker) to embed their own JavaScript into a Confluence page.

  • The hacker might take advantage of this flaw to steal other users' session cookies or other credentials, by sending the credentials back to the hacker's own web server.
  • The hacker's text and script might be displayed to other people viewing the Confluence page. This is potentially damaging to your company's reputation.

To fix the vulnerabilities described below, Atlassian recommends that you take one of the following steps:

  • Upgrade to Confluence 2.7, or
  • Download and install the patch for Confluence 2.5.8 or Confluence 2.6.2 from our JIRA site – see issue CONF-10164.

You can read more about XSS attacks at cgisecurity, CERT and other places on the web.

Risk Mitigation

If you judge it necessary, you can disable public access (e.g. anonymous access and public signon) to your wiki until you have applied the necessary patch or upgrade. For even tighter control, you could restrict access to trusted groups only.

Vulnerability

A hacker can inject their own JavaScript into the following Confluence action:

http://www.anyhost.com/confluence/dashboard/configurerssfeed.action

The above Confluence action is used to build an RSS feed based on your Confluence pages and news items. The action is invoked when a selects 'Feed Builder' from your Confluence Dashboard. It can also be invoked by simply entering the URL into the browser address bar.

Fix

These issues have been fixed in Confluence 2.7, which you can download from the download centre.

A patch is available for Confluence 2.5.8 and Confluence 2.6.2. For more information, please see CONF-10164.

Our thanks to jeff peichel, who reported this issue to Atlassian. We fully support the reporting of vulnerabilities and we appreciate his working with us towards identifying and solving the problem.

Please let us know what you think of the format of this security advisory and the information we have provided.

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