TITLE: ExtCalendar calendar.php Cross-Site Scripting Vulnerabilities
SECUNIA ADVISORY ID: SA19321
VERIFY ADVISORY: http://secunia.com/advisories/19321/
CRITICAL: Less critical
IMPACT: Cross Site Scripting
WHERE: >From remote
SOFTWARE: ExtCalendar 1.x http://secunia.com/product/8810/
DESCRIPTION: Soot has discovered some vulnerabilities in ExtCalendar, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed to the "month", "year", "prev", and "next" parameters in calendar.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerabilities have been confirmed in version 1.1. Other versions may also be affected.
SOLUTION: Edit the source code to ensure that input is properly sanitised.
PROVIDED AND/OR DISCOVERED BY: Soot
ORIGINAL ADVISORY: http://soot.shabgard.org/ExtCalendar.txt
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.