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Cross-site Scripting (XSS) Vulnerability in BackupPC

Advisory ID:HTB22965
Vendor:Craig Barratt
Vulnerable Versions:3.1.0, perhaps 3.2.0 also vulnerable and probably prior
Tested Version:3.1.0, perhaps 3.2.0 also vulnerable
Advisory Publication:April 14, 2011 [without technical details]
Vendor Notification:April 14, 2011
Public Disclosure:April 28, 2011
Latest Update:April 26, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Medium
CVSSv2 Base Score:4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in BackupPC which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerabilities in BackupPC

The vulnerability exists due to input sanitation error in multiple parameters in index.cgi. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.

Exploitation examples:

http://host/index.cgi?action=browse&host=localhost&num=99999%22%3E%3Cscript%3Ealert%28123%29%3C/scri pt%3E
http://host/index.cgi?action=RestoreFile&host=localhost&num=1&share=%3Cscript%3Ealert%28234%2 9%3C/script%3E&dir=

Upgrade to version 3.2.1.

ImmuniWeb® by High-Tech Bridge

[1] High-Tech Bridge Advisory HTB22965 - https://www.htbridge.com/advisory/HTB22965 - Cross-site Scripting (XSS) Vulnerability in BackupPC
[2] BackupPC - backuppc.sourceforge.net - BackupPC is a high-performance, enterprise-grade system for backing up Linux, WinXX and MacOSX PCs and laptops to a server's disk.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.

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