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AUSCERT External Security Bulletin Redistribution
ESB-2006.0004 -- [UNIX/Linux][SCO]
New patches fix multiple denial of service vulnerabilities in TCP
5 January 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: TCP
Publisher: SCO
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact: Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2004-1060 CVE-2004-0791 CVE-2004-0790
Ref: ESB-2005.0575
Original Bulletin:
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4/SCOSA-2006.4.txt
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______________________________________________________________________________
SCO Security Advisory
Subject: OpenServer 5.0.6 OpenServer 5.0.7 : TCP Remote ICMP Denial Of Service Vulnerabilities
Advisory number: SCOSA-2006.4
Issue date: 2006 January 04
Cross reference: sr892503 fz530662 erg712759
CVE-2004-0790 CVE-2004-0791 CVE-2004-1060
______________________________________________________________________________
1. Problem Description
The Internet Control Message Protocol is used to alert hosts on
a network about certain situations, and the hosts then take
automatic action to prevent network failures or to improve
transport efficiency. The RFC recommends no security checking
for in-bound ICMP messages, so long as a related connection
exists, and may potentially allow several different Denials of
Service. The following individual attacks are reported:
A blind connection-reset attack is reported, which takes
advantage of the specification that describes that on receiving
a 'hard' ICMP error, the corresponding connection should be
aborted. A remote attacker may terminate target TCP connections
and deny service for legitimate users.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2004-0790 to this issue.
An ICMP Source Quench attack is reported, which exploits the
specification that a host must react to ICMP Source Quench
messages by slowing transmission on the associated connection. A
remote attacker may effectively degrade performance for a
legitimate connection.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2004-0791 to this issue.
A suitable forged ICMP PMTUD message may be used to reduce the
MTU for a given connection in a similar manner.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2004-1060 to this issue.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
OpenServer 5.0.6 ip and tcp drivers
OpenServer 5.0.7 ip and tcp drivers
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.6
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4
4.2 Verification
MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
The following packages should be installed on your system before
you install this fix:
RS506A
OSS646
ERG711746: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.3/SCOSA-2005.3.txt
ERG712606: ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2005.9/SCOSA-2005.9.txt
Upgrade the affected binaries with the following sequence:
1) Download the VOL* files to a directory.
2) Run the custom command, specify an install from media images,
and specify the directory as the location of the images.
5. OpenServer 5.0.7
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.4
5.2 Verification
MD5 (VOL.000.000) = 03ed8e901780e1535c113efeba72d8cd
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 Installing Fixed Binaries
The following package should be installed on your system before
you install this fix:
OSR507MP4 - OpenServer 5, Release 5.0.7 Maintenance Pack 4
Upgrade the affected binaries with the following sequence:
1) Download the VOL* files to a directory.
2) Run the custom command, specify an install from media images,
and specify the directory as the location of the images.
6. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0790
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0791
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1060
SCO security resources:
http://www.sco.com/support/security/index.html
SCO security advisories via email
http://www.sco.com/support/forums/security.html
This security fix closes SCO incidents sr892503 fz530662
erg712759.
7. Disclaimer
SCO is not responsible for the misuse of any of the information
we provide on this website and/or through our security
advisories. Our advisories are a service to our customers
intended to promote secure installation and use of SCO
products.
8. Acknowledgments
The SCO Group would like to thank Fernando Gont for reporting
these issues.
______________________________________________________________________________
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