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Cisco IOS HTTP Server Script Insertion Vulnerability
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Secunia Advisory:
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SA17780
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Release Date:
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2005-11-29
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Last Update:
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2005-12-07
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Critical:
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Moderately critical
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Impact:
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Cross Site Scripting
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| OS: | Cisco IOS 11.x
Cisco IOS 12.x
Cisco IOS R11.x
Cisco IOS R12.x
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| | CVE reference: | CVE-2005-3921 (Secunia mirror)
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Description:
Hugo Vazquez Carames has reported a vulnerability in Cisco IOS, which can be exploited by malicious people to conduct script insertion attacks.
The vulnerability is caused due to the memory dump feature of the HTTP server not properly sanitising the data in received packets before displaying them to the user in a HTML formatted page when the user views the "/level/15/exec/-/buffers/assigned/dump" link. This can be exploited to execute arbitrary script code in a user's browser session when the user views a memory dump containing malicious Javascript/HTML code from a received packet.
Successful exploitation may allow the attacker to perform certain actions that are accessible by the logon administrator. E.g. changing the "enable" password by injecting HTML code that requests for the "/level/15/configure/-/enable/secret/" link.
The vulnerability has been reported in IOS versions 11.0 through 12.4 with the HTTP server enabled.
Solution:
The vendor recommends the following workarounds until a fix is available.
1) Disable the HTTP server if it is not required.
2) Disable the HTTP WEB_EXEC service. This applies only to IOS 12.3(14)T and later in which selective HTTP and HTTPS services could be enabled or disabled.
3) Avoid using the web-based SHOW commands.
Refer to the vendor's original advisory for the specific commands.
Provided and/or discovered by:
Hugo Vazquez Carames
Changelog:
2005-12-02: Vendor issues workaround. Updated "Solution Status", "Description" and "Solution" sections.
2005-12-07: Added CVE reference.
Original Advisory:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20051201-http.shtml
Infohacking.com:
http://www.infohacking.com/INFOHACKING_RESEARCH/Our_Advisories/cisco/index.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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