[NT] Servers Alive Privilege Escalation Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05
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To: list@securiteam.com Date: 17 Mar 2005 11:11:46 +0200
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Servers Alive Privilege Escalation Vulnerability
------------------------------------------------------------------------
SUMMARY
" <http://www.woodstone.nu/salive/index.asp> Servers Alive is an
end-to-end network monitoring tool. It works agentless and across
operating systems. Its checks and alerts are on the cutting edge of
technology. It allows you to easily monitor hundreds of servers, or
Internet services on a server, for uptime and availability. When it
detects that a monitored service or computer has gone down it can make you
aware through a variety of means."
A privilege escalation vulnerability has been discovered in Servers Alive,
allowing a local non-privileged user to obtain SYSTEM privileges.
DETAILS
Vulnerable Systems:
* Servers Alive versions 4.1 and 5.0
Servers Alive can be run in two modes: as an application or as a service.
When run as a service, the application is permitted to interact with the
desktop and runs under the context of SYSTEM. When clicking the 'Local
manual' under help, the application does not drop privileges.
Consequently, it is possible to assume SYSTEM privileges by:
1) Viewing the source of the help file, which opens in Notepad
2) In Notepad, selecting File, Open
3) Launching a system utility such as cmd.exe.
Workaround:
* Only allow trusted users with Administrator-level privileges to logon
interactively.
* Physically secure the server on which the application is installed.
* Do not run the application as a service.
Disclosure Timeline:
* 01.24.05 - Vendor notified.
* 01.25.05 - Vendor responded, discussion ensued.
* 01.29.05 - CERT notified
* 02.18.05 - CVE Candidate Number assigned from CERT
* 03.15.05 - Advisory publicly released
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0352>
CAN-2005-0352
ADDITIONAL INFORMATION
The information has been provided by <mailto:secure@michaelstarks.com>
Michael Starks.
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