Sourcefire 3D Sensor and Defense Center Lets Remote Authenticated Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1022500
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SecurityTracker URL: http://securitytracker.com/id?1022500
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CVE Reference: CVE-2009-2344
(Links to External Site)
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Updated: Jul 27 2009
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Original Entry Date: Jul 2 2009
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Impact: User access via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 4.8 - 4.8.1
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Description: A vulnerability was reported in Sourcefire 3D Sensor and Defense Center. A remote authenticated user can obtain elevated privileges on the target system.
A remote authenticated user can submit a specially crafted request to the 'user.cgi' script to gain read and write access with administrator
privileges.
Other scripts on the device may also be affected.
The vendor was notified on May 5, 2009.
Gregory Duchemin
reported this vulnerability.
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Impact: A remote authenticated user can obtain elevated privileges on the target system.
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Solution: The vendor has issued a fix (4.8.2).
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Vendor URL: www.sourcefire.com/ (Links to External Site)
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Cause: Access control error
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Reported By: c3rb3r@videotron.ca
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Message History:
None.
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Source Message Contents
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Date: Wed, 1 Jul 2009 14:44:41 -0600
From: c3rb3r@videotron.ca
Subject: Sourcefire 3D Sensor and DC, privilege escalation vulnerability
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Affected product
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Sourcefire 3D Sensor and Defense Center 4.8.x
Tested on 4.8.0.3 and 4.8.0.4, 3D Sensor 2500 & DC 1000
All 4.8.x releases, up to and including 4.8.1, confirmed vulnerable by sourcefire.
Vulnerability details
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A privilege escalation vulnerability found in the Sensor and the DC web based management interfaces a
llows any local account
to take over the appliances administrator role.
While the "user.cgi" PERL script correctly validates that incoming requests belong to an au
thenticated session, in such a case
it also blindly grants read/write access to all accounts configuration with no regard for the role of
the request's originator.
Therefore a user with even the lowest level of access (ie. without any role configured) is able to pr
omote himself as administrator
and/or change others roles and account parameters at will.
Depending of the role or roles initially configured for this user, access to the user management page
may not be visible
into the interface's layout however the underlying script itself is still reachable and can be invoke
d "by hand".
Let's now consider a malicious operator named 'foobar' whose role has been restricted to "Event
analyst (read only)".
He would first log in to the appliance using his own credentials in order to get an authenticated ses
sion cookie (CGISESSID=xxxxxxxxxxxxxxxxxx)
then he could send a forged POST request similar to the one below:
POST https://x.x.x.x/admin/user/user.cgi HTTP/1.1
User-Agent: xxxxxx
Keep-Alive: 300
Connection: Keep-alive
Cookie: CGISESSID=xxxxxxxxxxxxxxxxxx
Content-Type: application/x-www-form-urlencoded
Content-length: 56
mode=edit&username=foobar&admin=%24admin&action_add=Save
He would thereafter be promoted to administrator by the appliance with full access into the managemen
t interface.
As a final note, several other scripts were reported being affected by the same vulnerability after i
nvestigation from the vendor.
Resolution
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Upgrade your appliance's software to 4.8.2 available from the Sourcefire's support website located at
https://support.sourcefire.com/
Disclosure timeline
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2009-05-05: Vulnerability discovered and reported to Sourcefire.
2009-06-30: 4.8.2 released by Sourcefire.
2009-07-01: Public disclosure.
Gregory Duchemin
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