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Multiple JelSoft vBulletin XSS Vulnerabilities
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March 15, 2022
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Description:
vBulletin is a powerful, scalable and fully customisable forums package for your web
site. Based on the PHP language, backed with a blisteringly fast MySQL back-end
database, vBulletin is the ideal community solution for all medium-to-large sites.
Problem:
JelSoft vBulletin is prone to attack in six different files (maybe more) The files
affected are "showthread.php", "forumdisplay.php", "private.php" and also the
"memberlist.php" file. The "memberlist.php" and "private.php" files does not seem to
be prone to the same attack I am about to talk about in versions three and later. The
type of XSS that takes place though on vBulletin is what I would call a higher risk XSS
issue. What I mean by that is alot of times slashes will be added to certain characters,
or certain strings/characters disallowed, but in vBulletin you can eneter pretty much
anything and have it execute sucessfully. This makes it a whole lot easier for an
attacker to use these vulnerabilities to disclose a users information. Below are examples
of the issues I have talked about here. Remember, the "memberlist.php" and "private.php"
issues only seems to affect versions prior to 3.0, but the others affect all versions.
showthread.php?t=[VID]&page;=[INT][XSS]
forumdisplay.php?f=[VID]&page;=[INT]&sort;=lastpostℴ=[XSS]
private.php?&action;=newmessage&userid;=[UID]&forward;=[XSS]
memberlist.php?action=getall&what;=[XSS]<r;=&perpage;=25&orderby;=username
admincp/index.php?vb_login_username=[XSS]
modcp/index.php?vb_login_username=[XSS]
Solution:
JelSoft were notified and there will probably be a release of a patch or update to
resolve these issues.
Credits:
James Bercegay of the GulfTech Security Research Team.
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