Oxide Webserver 2.0.4 Denial of Service Vulnerability

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# Title    : Oxide Webserver Remote Denial of Service Vulnerability
# Author   : Antu Sanadi SecPod Technologies (www.secpod.com)
# Vendor   : http://sourceforge.net/projects/oxide/
# Advisory : http://secpod.org/blog/?p=516
#    : http://secpod.org/advisories/SecPod_Oxide_WebServer_DoS_Vuln.txt
# Software : Oxide Webserver v2.0.4 and prior.
# Date     : 29/06/2012
#
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SecPod ID: 1043                                    24/01/2012 Issue Discovered
                                                   19/06/2012 Vendor Notified
                                            No Response from vendor
                                                   18/07/2012 Advisory Released

Class: Denial of Service                           Severity: High

Overview:
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Oxide Webserver v2.0.4 is prone to a remote Denial of Service vulnerability
as it fails to handle crafted requests from the client properly.

Technical Description:
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The vulnerability is caused by an error in handling some crafted characters
in HTTP GET requests, which causes the server to crash.

Impact:
--------
Successful exploitation could allow an attacker to crash a vulnerable server.

Affected Software:
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Oxide Webserver version 2.0.4 and prior.

Tested on,
Oxide Webserver version 2.0.4 on Windows XP SP3

References:
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http://secpod.org/blog/?p=516
http://sourceforge.net/projects/oxide
http://sourceforge.net/projects/oxide-ws/files
http://secpod.org/advisories/SecPod_Oxide_WebServer_DoS_Vuln.txt

Proof of Concept:
----------------
http://www.example.com:80/?.
http://www.example.com:80/<.
http://www.example.com:80/$.
http://www.example.com:80/cc.

Solution:
----------
Not available

Risk Factor:
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    CVSS Score Report:
        ACCESS_VECTOR          = NETWORK
        ACCESS_COMPLEXITY      = LOW
        AUTHENTICATION         = NONE
        CONFIDENTIALITY_IMPACT = NONE
        INTEGRITY_IMPACT       = NONE
        AVAILABILITY_IMPACT    = COMPLETE
        EXPLOITABILITY         = PROOF_OF_CONCEPT
        REMEDIATION_LEVEL      = UNAVAILABLE
        REPORT_CONFIDENCE      = CONFIRMED
        CVSS Base Score        = 7.8 (High) (AV:N/AC:L/Au:N/C:N/I:N/A:C)

Credits:
--------
Antu Sanadi of SecPod Technologies has been credited with the discovery of this
vulnerability.