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SCO Security Advisory

Subject: UnixWare 7.1.3 UnixWare 7.1.1 : Vulnerabilities in long-lived TCP connections / Rose attack
Advisory number: SCOSA-2005.14
Issue date: 2005 February 07
Cross reference: sr890247 fz529384 erg712598 sr890286 fz529414 erg712605
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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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UnixWare 7.1.3 /etc/conf/pack.d/inet/Driver_atup.o
/etc/conf/pack.d/inet/Driver_mp.o
/etc/conf/pack.d/inet/space.c
/usr/include/netinet/ip_var.h

UnixWare 7.1.1 /etc/conf/pack.d/inet/Driver_atup.o
/etc/conf/pack.d/inet/Driver_mp.o
/etc/conf/pack.d/inet/space.c
/usr/include/netinet/ip_var.h

3. Solution

The proper solution is to install the latest packages.

4. UnixWare 7.1.3

4.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14

4.2 Verification

MD5 (erg712598.pkg.Z) = c037e34427caf7f752eac2680f7dd29a

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:

Download erg712598.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712598.pkg.Z
# pkgadd -d /var/spool/pkg/erg712598.pkg

5. UnixWare 7.1.1

5.1 Location of Fixed Binaries

ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.14

5.2 Verification

MD5 (erg712598.711.pkg.Z) = 010281cae30aec75daa9b03b1ebbb522

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:

Download erg712598.711.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712598.711.pkg.Z
# pkgadd -d /var/spool/pkg/erg712598.711.pkg

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 sr890247 fz529384
erg712598 sr890286 fz529414 erg712605.

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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