[UNIX] Cerberus Helpdesk Vulnerabilities

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Cerberus Helpdesk Vulnerabilities
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SUMMARY

<http://www.cerberusweb.com/> Cerberus Helpdesk is "a WebGroup Media
helpdesk suite based in PHP environment". Multiple security flaws have
been found in Cerberus Helpdesk, these flaws allow remote attackers to
trigger SQL injection and cross site scripting vulnerabilities.

DETAILS

Vulnerable Systems:
* Cerberus GUI version 2.649
* Cerberus Support Center versions 2.649 up to 3.2.0pr2

Support Center:
An SQL injection in attachment_send.php (line 112):
You can download files from other users or use blind SQL injection
attacks:

Example:
../support-center/cerberus-support-center/attachment_send.php?file_id=N
[SQL] &thread_id=1

Vulnerable code:
$sql = "SELECT part_content FROM thread_attachments_parts WHERE file_id =
$file_id";

XSS:
http://server/support-center/index.php?mod_id=2&;
kb_ask=%3Cscript%3Ealert%28%22XSS%22%29%3C%2Fscript%3E

Cerberus-gui (parser-related):
There are few SQL injections if XML is maliciously generated:

1) SQL injections in email_parser.php:
Function: "is_queue_address" (line: 1397) doesn t check properly the
"$addy" value.

Vulnerable code:
$sql = sprintf("SELECT q.queue_name, q.queue_mode,
q.queue_email_display_name, ".
"qa.queue_addresses_id, qa.queue_id, qa.queue_address, ".
"qa.queue_domain, q.queue_prefix, q.queue_response_open, ".
"q.queue_send_open, q.queue_response_gated ".
"FROM queue_addresses qa ".
"LEFT JOIN queue q USING (queue_id) ".
"WHERE LOWER(qa.queue_address) = '%s' ".
"AND LOWER(qa.queue_domain) = '%s'",
strtolower($mailbox),
strtolower($domain)

Function: "is_banned_address" (line: 752) doesn't check "$address"
properly.

Vulnerable code:
SELECT a.address_banned FROM address a WHERE a.address_address =
'".$address."'";

Function: "is_admin_address" (line 1532) you can bypass this function
using, as an email address, the following query:
"'OR'u.user_superuser'='1'--".

Example of result of this query:
SELECT u.user_id FROM user u WHERE u.user_email != '' AND u.user_email =
'' OR u.user_superuser = '1'

Vulnerable code:
SELECT u.user_id FROM user u WHERE u.user_email != '' AND u.user_email =
'$address'";

2) SQL injection in structs.php:
Function: "cer_email_address_struct" (line: 167) doesn t check the
following query.

Vulnerable code:
$sql = "SELECT a.address_id,a.address_banned FROM address a WHERE
a.address_address = '" . $a_address . "'";

Cerberus GUI:
1) SQL injection in cer_KnowledgebaseHandler.class.php:

Function: "_load_article_details" (line 270), you can fetch "superuser"
md5 password with blind sql injection.

Example:
/cerberus-gui/knowledgebase.php?mode=view_entry&root=2&
sid=c7bb6a0d5f83d61d75053c85c14af247&kbid=4 [SQL]

Vulnerable code:
$sql = "SELECT k.kb_id, k.kb_entry_date, k.kb_public, k.kb_category_id,
k.kb_keywords, kp.kb_problem_summary, kp.kb_problem_text,
kp.kb_problem_text_is_html, " .
" ks.kb_solution_text, ks.kb_solution_text_is_html, kc.kb_category_name,
u.user_login As entry_user, k.kb_avg_rating, k.kb_rating_votes " .
" FROM knowledgebase k LEFT JOIN knowledgebase_problem kp ON
(kp.kb_id=k.kb_id) LEFT JOIN knowledgebase_solution ks on
(ks.kb_id=k.kb_id) ".
" LEFT JOIN knowledgebase_categories kc ON
(kc.kb_category_id=k.kb_category_id) LEFT JOIN user u ON
(k.kb_entry_user=u.user_id) " .
" WHERE k.kb_id = " . $kbid;

2) SQL injection in "addresses_export.php":
Example:
POST:
/cerberus-gui/addresses_export.php?sid=c61ce82aa50569705dd774c33644446c&
queues%5B%5D=[ SQL ]&delimiter=comma&file_type=screen&form_submit=x

Vulnerable code:
$sql = "SELECT DISTINCT a.address_address FROM ticket t LEFT JOIN thread
th ON (t.min_thread_id=th.thread_id) LEFT JOIN address a ON
(th.thread_address_id=a.address_id) WHERE t.ticket_queue_id IN ($queues)
ORDER BY a.address_address ASC;";

3) SQL injection in "display.php". "$thread" is not checked
Vulnerable code:
$sql = "SELECT th.thread_address_id, a.address_address FROM thread th LEFT
JOIN address a ON (th.thread_address_id = a.address_id) ".
"WHERE th.thread_id = " . $thread;

4) SQL injection in "display_ticket_thread.php" (line 52):
Example:
/cerberus-gui/display_ticket_thread.php?type=comment&
sid=a640d024f84be01320aacb0ec6c87d74&ticket=[SQL]

Vulnerable code:
$sql = "SELECT t.ticket_id, t.ticket_subject, t.ticket_status,
t.ticket_date, t.ticket_assigned_to_id, t.ticket_queue_id,
t.ticket_priority, th.thread_address_id, ad.address_address,
t.queue_addresses_id, q.queue_name " .
"FROM ticket t, thread th, address ad, queue q " .
"WHERE t.ticket_queue_id IN ($u_qids) AND th.ticket_id = t.ticket_id AND
t.ticket_queue_id = q.queue_id AND th.thread_address_id = ad.address_id
AND t.ticket_id = " . $ticket . " GROUP BY th.thread_id LIMIT 0,1";

Disclosure Timeline:
15-20/Nov/2005 - Bugs discovered
11/Dec/2005 - The Author has been notified.
19/Dec/2005 - Full Disclosure


ADDITIONAL INFORMATION

The information has been provided by <mailto:aramosf@xxxxxxxxx> Alejandro
Ramos.



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