Re: XSS in CiscoSecure ACS v3.0

From: Lisa Napier (lnapierat_private)
Date: Thu Jun 20 2002 - 19:15:50 PDT

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    Hi Dave,
    
    Thank you for posting this information.  The defect ID's for Cisco 
    customers who wish to track this issue via the Cisco Bug toolkit on our 
    website are: CSCdx88709 and CSCdx88715 for both affected release versions.
    
    Thank you,
    
    Lisa Napier
    Product Security Incident Response Team
    Cisco Systems
    
    At 01:39 PM 6/14/2002, Dave Palumbo wrote:
    >sMax. Security Advisory
    >-------------------------------
    >
    >Title:  Cross-Site Scripting in CiscoSecure ACS v3.0
    >Date:   June 14, 2002
    >
    >PRODUCT AFFECTED:
    >
    >CiscoSecure ACS v3.0 (Win32)
    >
    >PRODUCT OVERVIEW:
    >
    >CiscoSecure ACS is Cisco's implementation of RADIUS.
    >v3.0 is the current release of the product.  Taken
    >from their website: "Cisco Secure ACS provides
    >authentication, authorization, and accounting
    >(AAA—pronounced "triple A") services to network
    >devices that function as AAA clients, such as a
    >network access server, PIX Firewall, or router."
    >
    >VULNERABILITY:
    >
    >Testing CiscoSecure ACS v3.0(1), Build 40 reveals a
    >cross-site scripting problem in the web server
    >component.  Specifically, the "action" argument that
    >the setup.exe handler uses does not appear to do
    >proper input validation.  Other arguments were not
    >tested, though they may be vulnerable as well.
    >
    >Proof-of-concept:
    >http://IP.ADD.RE.SS:dyn_port/setup.exe?action=>alert('foo+bar')</script>&page=list_users&user=P*
    >(URL may wrap)
    >
    >Obviously one needs to already be authenticated to the
    >ACS web server for this to successfully be carried
    >out.
    >
    >SOLUTION:
    >
    >Follow best practices, don't make the web component of
    >ACS server available over the Internet.
    >
    >Cisco was contacted on May 21st.  They have committed
    >to fixing this in the next release of the software,
    >due out in "mid to late summer".
    >
    >- Dave Palumbo
    >
    >
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