Re: - Cisco IOS HTTP Server code injection/execution vulnerability-

From: Florian Weimer (fw_at_deneb.enyo.de)
Date: 11/28/05

  • Next message: Ivan Arce: "Core FORCE and OpenBSD PF's" 
    To: picardos@terra.es
Date: Mon, 28 Nov 2005 22:55:25 +0100

    > It has been identified a vulnerability in the Cisco IOS Web
    > Server. An attacker can inject arbitrary code in some of the
    > dynamically generated web pages. To succesfully exploit the
    > vulnerability the attacker only needs to know the IP of the
    > Cisco. THERE'S NO NEED TO HAVE ACCESS TO THE WEB SERVER! Once the
    > code has been inyected, attacker must wait until the admin browses
    > some of the affected web pages.

    Isn't your exploit somewhat complicated? Just put

    <img src="http://192.0.2.1/level/15/configure/-/enable/secret/mypassword"/>

    on a web page, and trick the victim to visit it while he or she is
    logged into the Cisco router at 192.0.2.1 over HTTP. This has been
    dubbed "Cross-Site Request Forgery" a couple of years ago, but the
    authors of RFC 2109 were already aware of it in 1997. At that time,
    browser-side countermeasures were proposed (such as users examining
    the HTML source code *cough*), but current practice basically mandates
    that browsers transmit authentication information when following
    cross-site links.

    Such attacks are probably more problematic on low-end NAT routers
    whose internal address defaults to 192.168.1.1 and which generally
    offer HTTP access, which makes shotgun exploitation easier. So much
    for the "put your Windows box behind a NAT router" advice you often
    read.

  • Next message: Ivan Arce: "Core FORCE and OpenBSD PF's"

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