OpenServer 5.0.6 OpenServer 5.0.7 : Vulnerabilities in long-lived TCP connections / Rose attack
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SCO Security Advisory
Subject: OpenServer 5.0.6 OpenServer 5.0.7 : Vulnerabilities in
long-lived TCP connections / Rose attack
Advisory number: SCOSA-2005.9
Issue date: 2005 February 07
Cross reference: sr890287 fz528415 erg712606 sr890248 fz529385 erg712599
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1. Problem Description
TCP, when using a large Window Size, makes it easier for
remote attackers to guess sequence numbers and cause a
denial of service (connection loss) to persistent TCP
connections by repeatedly injecting a TCP RST packet,
especially in protocols that use long-lived connections,
such as BGP.
Reference : NISCC Vulnerability Advisory 236929
Reference : CERT Technical Cyber Security Alert TA04-111A
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0230 to this issue.
2. Vulnerable Supported Versions
System Binaries
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OpenServer 5.0.6 /usr/lib/tcprt/ID/ip/Driver.o
/usr/lib/tcprt/ID/ip/Space.c
/usr/include/sys/netinet/ip_var.h
OpenServer 5.0.7 /usr/lib/tcprt/ID/ip/Driver.o
/usr/lib/tcprt/ID/ip/Space.c
/usr/include/sys/netinet/ip_var.h
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-2005.9
4.2 Verification
MD5 (VOL.000.000) = 472ab4332103f16740c817e546236065
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
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-2005.9
5.2 Verification
MD5 (VOL.000.000) = 472ab4332103f16740c817e546236065
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 Installing Fixed Binaries
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=CAN-2004-0230
http://www.uniras.gov.uk/niscc/docs/al-20040420-00199.html?lang=en
http://www.us-cert.gov/cas/techalerts/TA04-111A.html
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 sr890287 fz528415
erg712606 sr890248 fz529385 erg712599.
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
SCO would like to thank NISCC, Steve Bellovin, Rob Thomas
and Paul Watson, Cisco Systems Inc. and Juniper Networks
Inc.
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