#VU44260 Cross-site scripting in BackupPC - CVE-2011-4923

Vulnerability identifier: #VU44260

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2011-4923

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BackupPC
Other software / Other software solutions

Vendor: CBARRATT

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.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BackupPC: 3.0.0 - 3.2.1

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.