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Easy File Sharing Persistent Cross Site Scripting

Easy File Sharing Persistent Cross Site Scripting
Posted Jul 25, 2014
Authored by Joseph Giron

Easy File Sharing webserver suffers from a persistent cross site scripting vulnerability in the forum messages.

tags | exploit, xss
SHA-256 | 5fc2edb57adb417649cbb0813d961bc52ba43a0b6708d698727e55ceb5ae4c10

Easy File Sharing Persistent Cross Site Scripting

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I saw a posting a month or 2 ago for a BOF in an FTP server belonging to EFS Software here: http://www.securityfocus.com/bid/19243
At first there was no additional details provided and I hunted up and down before finding it after some fuzzing (stack smash in password).

While on the hunt, I found one not listed.

Easy file sharing web server - XSS in forum messages.

Its persistent XSS. Don't see that much these days. The BB code (which looks suspiciously like it was lifted from PHPBB) fails to filter javascript and other html attributes from the posts.

Example exploit in test message:
[IMG]testing123" onmouseover="alert('10000')">[/IMG]

Peeking inside with IDA, we see why:
.data:0055D61C ; char aImgSrcSBorde_0[]
.data:0055D61C aImgSrcSBorde_0 db '<img src=%s border=0>',0 ; DATA XREF: sub_41B930+49F
.data:0055D61C ; sub_41FC10+6B2 ...
Following the subroutine, there's no real formatting or escaping done. I mean the forum posting does attempt some form of filtering, but its bypassed easily.
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