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Elgg Twitter Widget Cross Site Scripting

Elgg Twitter Widget Cross Site Scripting
Posted Jan 30, 2013
Authored by Moritz Naumann

Elgg versions 1.8.12 and 1.7.16 suffer from a cross site scripting vulnerability in the Twitter Widget module.

tags | advisory, xss
SHA-256 | 0320007144203c2cbfa4115016d3b9111ca9e9c639ff2e1bf920708cb685b296

Elgg Twitter Widget Cross Site Scripting

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Hello dear XSS bored audience,

the PHP based social networking engine Elgg [1], versions 1.8.12 and
1.7.16 and earlier, bears a persistent script injection vulnerability in
its core module "Twitter widget", which allows for XSS attacks.

On installations which have the Twitter widget activated (disabled by
default, but in use on many installations), any authenticated user may
add the Twitter to their activity / dashboard page. Editing its
configuration allows the user to set the twitter_username parameter. The
value stored in this parameter will be echoed without sanitation [2]
when this page is viewed by any other user, authenticated or not.

For mitigation, the Twitter widget can be disabled by a site admin (in
the admin backend's plugin configuration area).

According to changes committed [3] to their Git repository Elgg
developers will provide a fix for this issue in the upcoming (?) 1.8.13
release.

This was originally reported by
Moritz Naumann
http://moritz-naumann.com
on January 17, to security[at]elgg.org, and got me a prompt vendor
reply. Coordination of advisory release is something to improve upon
next time.

A CVE ID has, to my knowledge, not yet been assigned. Secunia has
assigned it SA52007.

Have fun,

Moritz

[1] http://elgg.org/
[2]
http://github.com/Elgg/Elgg/commit/a74a88501c41e89c8bcd7fc650ae2f8cc0a5003d#L2L21
[3]
http://github.com/Elgg/Elgg/commit/19dc507c2fccb378be2a44a762edf6c1e7afa334#L0R11
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