Moritz Naumann has discovered a vulnerability in Elgg, which can be exploited by malicious users to conduct script insertion attacks.
Input passed via the "params[twitter_username]" POST parameter to action/widgets/save is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site if malicious data is viewed.
Successful exploitation requires the Twitter Widget plugin to be enabled (disabled by default).
The vulnerability is confirmed in versions 1.7.16 and 1.8.12 (Twitter Widget plugin version 1.7) and reported in the 1.7.x versions prior to 1.7.17 and in the 1.8.x versions prior to 1.8.13.
Solution: Update to version 1.7.17 or 1.8.13.
Provided and/or discovered by: Moritz Naumann, Naumann IT Security Consulting.
Original Advisory: Elgg:
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