Alienvault OSSIM/USM: Root Compromise -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0605
        CVE-2016-7955 - Alienvault OSSIM/USM Authentication Bypass
                               8 March 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Alienvault OSSIM/USM
Publisher:         Zero Day Initiative
Operating System:  Debian GNU/Linux
                   Network Appliance
                   Virtualisation
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7955  

Original Bulletin: 
   http://www.zerodayinitiative.com/advisories/ZDI-16-517

Comment: Proof of Concept code is publically available

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AlienVault Unified Security Management Remote Authentication Bypass 

Vulnerability
ZDI-16-517: September 19th, 2016
CVSS Score 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C) 
CVE: CVE-2016-7955

Affected Vendors
AlienVault

Affected Products
Unified Security Management

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication 
requirements on vulnerable installations of AlienVault Unified Security 
Manager. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the logcheck function in session.inc. By 
providing a specific value as a user-agent, an attacker can bypass 
authentication to a number of pages. In addition to viewing information, 
it's possible to modify the application and achieve arbitrary code 
execution as root.
Vendor Response
AlienVault has issued an update to correct this vulnerability. More details 
can be found at:

https://www.alienvault.com/forums/discussion/7765/alienvault-v5-3-1-hotfix

Vulnerable Versions: <=5.3.0
Fixed Version: 5.3.1

Disclosure Timeline

2016-08-30 - Vulnerability reported to vendor
2016-09-19 - Coordinated public release of advisory

Credit
This vulnerability was discovered by:
Peter Lapp (lappsec)

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