Cross-site scripting in BackupPC - CVE-2011-4923

Detailed vulnerability description

Vulnerability allows a remote attacker to perform Cross-site scripting attacks.

An input validation error exists in View.pm in BackupPC 3.0.0, 3.1.0, 3.2.0, 3.2.1, and possibly earlier when processing num parameter in a view action to index.cgi, related to the log file viewer, a different vulnerability than CVE-2011-3361. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

How to mitigate CVE-2011-4923

Sources

• http://secunia.com/advisories/46615
• http://ubuntu.com/usn/usn-1249-1
• http://www.openwall.com/lists/oss-security/2011/10/27/8
• http://www.openwall.com/lists/oss-security/2012/01/04/15
• http://www.securityfocus.com/bid/50406
• https://exchange.xforce.ibmcloud.com/vulnerabilities/71030