(Caldera Issues Fix for SCO OpenServer) IP Filter Firewall Software May Let Unauthorized Packets Through the Firewall
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SecurityTracker Alert ID: 1003811 |
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SecurityTracker URL: http://securitytracker.com/id/1003811
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Mar 13 2002
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Impact:
Host/resource access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): up to and including 3.3.21 and 3.4.16
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Description:
It is reported that a serious vulnerability exists in the IP Filter firewall software. When the firewall is using "fragment caching", a remote user can send nearly any packet through the firewall.
According to the vendor, when the firewall is matching a packet fragment, only srcip, dstip and IP ID# are checked and the fragment cache is checked *before* any firewall rules are checked. If all fragments are blocked with a firewall rule, fragment cache entries can still be created by packets that match current firewall state information.
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Impact:
A remote user can send unauthorized packets through the firewall (if the firewall uses fragment caching).
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Solution:
The vendor has released a fix for OpenServer:
ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.9/
The verification checksum is:
MD5 (erg711678) = 7608023bdd367331a8088a92b114db5c
Upgrade the affected binaries with the following commands:
Download erg711678 to the /tmp directory
# cd /tmp
# tar xvf erg711678
Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.
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Vendor URL: coombs.anu.edu.au/ipfilter/ip-filter.html (Links to External Site)
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Cause:
State error
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Underlying OS:
UNIX (Open UNIX-SCO)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Mon, 11 Mar 2002 17:10:17 -0800
Subject: Security Update: [CSSA-2002-SCO.9] OpenServer: IPFilter may incorrectly pass packets
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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca
___________________________________________________________________________
Caldera International, Inc. Security Advisory
Subject: OpenServer: IPFilter may incorrectly pass packets
Advisory number: CSSA-2002-SCO.9
Issue date: 2002 March 11
Cross reference:
___________________________________________________________________________
1. Problem Description
When matching a packet fragment, insufficient checks were
performed to ensure the fragment is valid. Malicious remote
users may be able to bypass filtering rules, allowing them to
potentially circumvent the firewall.
2. Vulnerable Supported Versions
Operating System Version Affected Files
------------------------------------------------------------------
OpenServer <= 5.0.6a /etc/ipnat
/etc/ipfnat
/etc/conf/pack.d/ipl/Driver.o
/etc/ipmon
/etc/ipfstat
/etc/ipf
3. Workaround
None.
4. OpenServer
4.1 Location of Fixed Binaries
ftp://stage.caldera.com/pub/security/openserver/CSSA-2002-SCO.9/
4.2 Verification
MD5 (erg711678) = 7608023bdd367331a8088a92b114db5c
md5 is available for download from
ftp://stage.caldera.com/pub/security/tools/
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following commands:
Download erg711678 to the /tmp directory
# cd /tmp
# tar xvf erg711678
Run the custom command, specify an install from media images,
and specify the /tmp directory as the location of the images.
5. References
This and other advisories are located at
http://stage.caldera.com/support/security
This advisory addresses Caldera Security internal incidents
SCO-236-1763, erg711678
6. Disclaimer
Caldera International, Inc. is not responsible for the misuse
of any of the information we provide on our website and/or
through our security advisories. Our advisories are a service
to our customers intended to promote secure installation and
use of Caldera International products.
7. Acknowledgements
Caldera would like to admit borrowing the problem description
text from FreeBSD security advisory FreeBSD-SA-01:32.
___________________________________________________________________________
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