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Cross-Site Scripting (XSS) in GuppY

Advisory ID:HTB23176
Product:GuppY
Vendor:GuppY
Vulnerable Versions:4.6.26 and probably prior
Tested Version:4.6.26
Advisory Publication:October 2, 2013 [without technical details]
Vendor Notification:October 2, 2013
Vendor Fix:October 12, 2013
Public Disclosure:October 23, 2013
Latest Update:October 14, 2013
Vulnerability Type:Cross-Site Scripting [CWE-79]
CVE Reference:CVE-2013-5983
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 Security Research Lab discovered two XSS vulnerabilities in GuppY, which can be exploited to perform Cross-Site Scripting attacks against users of vulnerable application.

1) Cross-Site Scripting (XSS) in GuppY: CVE-2013-5983
1.1 The vulnerability exists due to insufficient sanitisation of user-supplied data in "an" HTTP GET parameter passed to "/agenda.php" script. A remote attacker can trick a logged-in user 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 the "alert()" JavaScript function to display user's cookies:
http://[host]/agenda.php?agv=2&an=%22%20onmouseover%3dalert%28%27document.cookie %27%29%20%22
1.2 The vulnerability exists due to insufficient sanitisation of user-supplied data in "cat" HTTP GET parameter passed to "/mobile/thread.php" script. A remote attacker can trick a logged-in user 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 the "alert()" JavaScript function to display user's cookies:
http://[host]/mobile/thread.php?cat=1%22%20onmouseover%3dalert%28%27document.coo kie%27%29%20%22


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Solution:
Update to GuppY 4.6.28

More Information:
http://www.freeguppy.org/thread.php?lng=en&pg=244900&cat=200


References:
[1] High-Tech Bridge Advisory HTB23176 - https://www.htbridge.com/advisory/HTB23176 - Cross-Site Scripting (XSS) in GuppY.
[2] GuppY - http://www.freeguppy.org - GuppY the easy web portal that requires no database.
[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.
[5] ImmuniWeb® - a PCI compliant web application penetration test combined with managed vulnerability scan. Configure, schedule, and manage online 24/7.
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