WordPress BackWPup 3.0.12 Cross Site Scripting Vulnerability

Product: BackWPup WordPress Plugin
Vendor: Inpsyde GmbH
Vulnerable Version(s): 3.0.12 and probably prior
Tested Version: 3.0.12
Vendor Notification: June 19, 2013 
Vendor Patch: August 12, 2013 
Public Disclosure: August 21, 2013 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-4626
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered XSS vulnerability in BackWPup WordPress Plugin, which can be exploited to perform cross-site scripting attacks against administrator of vulnerable application. 


1) Cross-Site Scripting (XSS) in BackWPup WordPress Plugin: CVE-2013-4626

The vulnerability exists due to insufficient filtration of user-supplied data in "tab" HTTP GET parameter passed to "/wp-admin/admin.php" script. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses "alert()" JavaScript function to display administrator's cookies:

http://[host]/wp-admin/admin.php?page=backwpupeditjob&tab=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E


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Solution:

Upgrade to BackWPup 3.0.13

More Information:
http://wordpress.org/plugins/backwpup/changelog/

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References:

[1] High-Tech Bridge Advisory HTB23161 - https://www.htbridge.com/advisory/HTB23161 - Cross-Site Scripting (XSS) in BackWPup WordPress Plugin.
[2] BackWPup WordPress Plugin - http://wordpress.org/plugins/backwpup/ - BackWPup is the All-in-One backup solution for WordPress.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] 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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