Kerio WinRoute Firewall Administration Interface Flaw Lets Remote Users Create Denial of Service Conditions
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SecurityTracker Alert ID: 1006426 |
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SecurityTracker URL: http://securitytracker.com/id/1006426
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Mar 31 2003
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 5.0.1
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Description:
A denial of service vulnerability was reported in Kerio WinRoute Firewall. A remote user can cause CPU utilization to rise and connection requests to be dropped.
Positive Technologies reported that a remote user can send a single HTTP request to the firewall's web-based administration port (tcp 4080) to cause CPU utilization to reach 100%. According to the report, about half of the subsequent connection requests will be dropped.
A demonstration exploit request (without the expected 'Server' line) is provided:
GET / HTTP/1.0
Authorization: Basic XXX
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Impact:
A remote user can cause the target host's processor utilization to reach 100% and connections to the target to be dropped.
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Solution:
The vendor has released a fixed version (5.0.2).
The author of the report indicates that you can also block remote access to TCP port 4080 on the firewalled host.
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Vendor URL: www.kerio.com/us/kwf_home.html (Links to External Site)
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Cause:
Resource error, State error
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Underlying OS:
Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: Mon, 31 Mar 2003 10:00:26 +0400
Subject: Positive Technologies Security Advisory 2003-0307: DoS-attack in Kerio WinRoute Firewall
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Positive Technologies Security Advisory
http://www.ptsecurity.com
Title: DoS-attack in Kerio WinRoute Firewall
Date: March, 07 2003
Severity: High
Application: Kerio WinRoute Firewall 5.0.1
Platform: Windows 95/98/ME/NT/2000/XP
Vendor Status: Notified, patched in version 5.0.2
I. DESCRIPTION
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Denial of Service condition exists in Kerio WinRoute Firewall's Web
administration interface which hand service with 100% CPU utilization.
Positive Technologies reports that single simple HTTP request to Kerio
Winroute Firewall Web administration interface (TCP/4080)
GET / HTTP/1.0
Authorization: Basic XXX
instead of correct one:
GET / HTTP/1.0
Host: server
Authorization: Basic XXX
causes 100% CPU utilization of attacked computer.
II. IMPACT
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Remote user can launch denial of service attack against web interface
(port TCP/4080). Single request causes 100% CPU utilization. As a result
more than 50% of future connection requests may be lost disturbing
normal functionality of the networking services.
III. SOLUTION
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Block TCP/4080 access or upgrade to Kerio WinRoute Firewall 5.0.2.
IV. VENDOR FIX/RESPONSE
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Vendor was notified on 10.03.2003.
V. CREDIT
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Positive Technologies is information security company especially focused on
protection of corporate networks from external attacks. The main trend of
PT’s activity is computer networks security audit and service. PT offers
wide range of services in the filed of information security: from network
architecture development or optimization to consulting and custom software
source-code examination.
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