Synopsis:

All versions of e107 have a vulnerability that

allows html tags and content to be posted to the stats

page and to be listed under Referers and may also list

a screen size that they wish.

Description:

All versions of e107 have a vulnerability that

allows html tags and content to be posted to the stats

page and to be listed under Referers and thus allowing

an attacker to put any site link or code they want on

the list of Referers.

The Problem lies within the e107 log plugin

file /e107_plugins/log/log.php as it does not parse

< > and / tags thus allowing a user to enter html

content like so:

target.com/e107_plugins/log/log.php?referer=

code<br>goes<here>

&color=24&eself=http://www.target.com/stats.php&res=1341X1341

This would print out:

code

goes

here

In the Referers list and print out a screen size of

1341x1341 with a color depth of 24.

Impact:

This could lead someone to graffiti the stats page

with content of their liking which could further lead

someone to input their account info, etc. With use

of proxies someone may also advertise their site as

the top referer.

Work-around:

The easiest way to fix this problem is to

simply turn off stats all together. Even if you edit

log.php to parse html tags people will still be able

to post text to the Referers list.

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