phion netfence / Barracuda NG Firewall: Remote Command Execution with root Privileges

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Security Advisory
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Vulnerable Software:    Barracuda NG Firewall / phion netfence
Homepage:               http://www.barracudanetworks.com/
Found by:               Wolfgang Neudorfer, Lukas Nothdurfter  
Impact:                 Remote Command Execution with root Privileges
Severity:               Critical


Product Description
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The Barracuda NG Firewall is a family of hardware and virtual appliances 
designed to protect network infrastructure, improve site-to-site connectivity 
and simplify administration of network operations. Beyond its powerful network 
firewall, IPS and VPN technologies, the Barracuda NG Firewall integrates a 
comprehensive set of next generation firewall technologies, including Layer 7 
application control, WAN optimization, Web filtering, anti-virus, anti-spam and 
network access control enforcement.

[http://www.barracudanetworks.com/ns/products/ng_firewall_overview.php]


Vulnerability Description
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It is possible to execute an arbitrary command with root privileges on phion 
netfence 4.0.x, phion netfence < 4.2.15 and NG Firewall < 5.0.2 boxes with 
activated external authentication scheme (i.e. Active Directory). An attacker 
with the knowledge of an admin's username is able to perform arbitrary shell 
commands during the ssh login procedure on the box. The knowledge of the 
admin's password is not required.


Proof-of-Concept
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A proof-of-concept exploit will not be disclosed due to a responsible 
disclosure agreement with the vendor.


Severity
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Because of the high impact and the broad range of vulnerable versions, the 
severity is considered to be critical.


Vulnerable Versions
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phion netfence 4.0.x
phion netfence < 4.2.15
NG Firewall < 5.0.2


Patch
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Hotfix 392_Authentication for netfence 4.0.x
Hotfix 390_Authentication for netfence 4.2.x
Hotfix 391_Authentication for NG Firewall 5.0.x


Contact Timeline
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2011-03-14: Vendor informed
2011-03-15: Hotfixes available for download 
2011-06-11: Responsible disclosure 


References
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www.monkey-cert.at