SNS Vulnerability

BackupPC "share" Cross-Site Scripting Vulnerability

Description

A vulnerability has been discovered in BackupPC, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed to the "share" parameter in index.cgi (when "action" is set to "RestoreFile" and "host" is set to a valid host) is not properly sanitised before being returned to the user in RestoreFile.pm. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is confirmed in version 3.2.1. Other versions may also be affected.

Vulnerable Products

Vulnerable Software:
BackupPC 3.x

Solution

Edit the source code to ensure that input is properly sanitised.

CVE

CVE-2011-5081

References

HTB22965:
http://www.htbridge.ch/advisory/multiple_xss_vulnerabilities_in_backuppc.html

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

2011-04-28

Target Type

Server

Possible exploit

Remote