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Juniper Installer Service Stack Buffer Overflow Vulnerability

12.03.09

BACKGROUND

Juniper Installer Service is a client side component, which allows users with limited privileges to maintain client side components necessary for use with Juniper IVE OS network appliances. For more information see the vendor's website at the following link.

http://kb.juniper.net/KB9084

DESCRIPTION

Remote exploitation of a buffer overflow vulnerability in Juniper Networks Inc.'s Juniper Installer Service, as included in several Juniper client side applications, could allow an attacker to execute arbitrary code with SYSTEM privileges.

The Juniper Installer Service utilizes a named pipe for component installation management commands. Specifically, the commands DSSETUPSERVICE_CMD_INSTALLFILE, DSSETUPSERVICE_CMD_UNINSTALL, DSSETUPSERVICE_CMD_PING, and DSSETUPSERVICE_CMD_REGISTER are recognized by the Installer Service. The DSSETUPSERVICE_CMD_UNINSTALL command handles user supplied data incorrectly, which leads to a stack-based buffer overflow.

ANALYSIS

Exploitation of this vulnerability allows an attacker to execute arbitrary code on the targeted machine with SYSTEM privileges. An attacker would need to have access to the named pipe (\Device\LanmanRedirector\%SERVERNAME%\pipe\NeoterisSetupService) created by the Juniper Installer Service. The attacker would need to craft a malformed DSSETUP_CMD_UNINSTALL command, which contains an overly large string to trigger the buffer overflow. The service automatically restarts when the service crashes. This gives an attacker many chances to attempt to exploit this issue.

DETECTION

The Juniper Installer Service (dsInstallerService.dll) as included with Juniper's Odyssey Access Client version 4.72.11421.0 was tested and found to be vulnerable. Previous versions may also be vulnerable. It is important to note that Juniper supports several products, which include the Juniper Installer Service. These products may also be vulnerable to this issue.

WORKAROUND

iDefense recommends disabling the Juniper Unified Network Service. This workaround may impact component management on the client side.

VENDOR RESPONSE

Juniper Networks, Inc has released a patch which addresses this issue. Information about vendor updates can be found by clicking on the URLs shown. This information is only available to Juniper customers with a valid login.

https://www.juniper.net/alerts/viewalert.jsp? actionBtn=Search&txtAlertNumber=PSN-2009-10-540&viewMode=view

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

10/28/2008 - Initial Contact
10/29/2008 - PoC Sent
12/03/2009 - Public disclosure

CREDIT

This vulnerability was reported to iDefense by Ruben Santamarta.

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LEGAL NOTICES

Copyright © 2010 Verisign, Inc.

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