SNS Vulnerability

PunBB URL Cross-Site Scripting Vulnerability

Description

Piotr Duszynski has discovered a vulnerability in PunBB, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed via the URL to e.g. login.php, misc.php, delete.php, edit.php, and profile.php (when "csrf_token" is invalid) is not properly sanitised in include/functions.php before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
Successful exploitation requires that the victim uses a browser that does not URL-encode the request (e.g. Internet Explorer 6).
The vulnerability is confirmed in version 1.3.5. Other versions may also be affected.

Vulnerable Products

Vulnerable Software:
PunBB 1.x

Solution

Update to version 1.3.6.

CVE

CVE-2011-3371

References

Piotr Duszynski:
http://seclists.org/fulldisclosure/2011/Sep/158
PunBB:
http://punbb.informer.com/forums/topic/24427/multiple-xss-vulnerabilities/

Vulnerability Manager Detection

IPS Protection

ASQ Engine alarm	Available Since
XSS - Prevention - GET : suspicious 'iframe' tag found in URL	3.2.0
XSS - Prevention - GET : suspicious 'meta' tag found in URL	3.2.0
XSS - Prevention - GET : suspicious tag with event found in URL	3.2.0
XSS - Prevention - GET : suspicious 'applet' tag found in URL	3.2.0
XSS - Phishing : suspicious 'div' tag found in URL	3.2.0
XSS - Prevention - GET : suspicious 'style' attribute found in URL	3.2.0
XSS - Prevention - GET : suspicious 'img' tag found in URL	3.2.0
XSS - Phishing : suspicious 'a' tag found in URL	3.2.0
XSS - Prevention - GET : cookie access attempt using script language found in URL	3.2.0
XSS - Prevention - GET : suspicious 'embed' tag found in URL	3.2.0
XSS - Prevention - GET : suspicious 'object' tag found in URL	3.2.0
XSS - Phishing : suspicious 'form' tag found in URL	3.2.0
XSS - Prevention - GET : javascript code found in URL	3.2.0
XSS - Prevention - GET : evasion attempt using tag characters encoding in URL	3.2.0
XSS - Prevention - GET : suspicious 'style' tag found in URL	3.2.0
XSS - Phishing : suspicious 'link' tag found in URL	3.2.0
XSS - Prevention - GET : 'script' tag found in URL	3.2.0
XSS - Prevention - GET : 'location' javascript object found in URL	3.2.0
XSS - Prevention - GET : suspicious 'div' tag found in URL	3.2.0

Risk level

Low

Vulnerability First Public Report Date

2011-09-19

Target Type

Server

Possible exploit

Remote