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SCO Security Advisory
Subject: UnixWare 7.1.4 UnixWare 7.1.3 UnixWare 7.1.1 : RPCBind
updated to prevent remote Denial of Service attack
Advisory number: SCOSA-2005.31
Issue date: 2005 July 27
Cross reference: sr894043 fz532477 erg712862 CAN-CAN-2005-2132
______________________________________________________________________________
1. Problem Description
While testing UnixWare 7.x against CVE CAN-2001-1124, Yun
Jonglim noticed that UnixWare rpcbind exhibits unexpected
behaviour after successive attacks.
When the UnixWare 7.x version of the RPC portmapper(rpcbind)
receives an invalid portmap request from a remote (or local)
host, it falls into a denial of service state and cannot
respond. As a result, the RPC services will not operate
normally.
The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the following names for these
issues: CAN-CAN-2005-2132.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
UnixWare 7.1.4 mp2 /usr/lib/tmp/libnsl.so
UnixWare 7.1.3 mp5 /usr/lib/tmp/libnsl.so
UnixWare 7.1.1 m5 /usr/lib/tmp/libnsl.so
3. Solution
The proper solution is to install the latest packages.
4. UnixWare 7.1.4
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31
4.2 Verification
MD5 (erg712862.714.pkg.Z) = 4c32902492be86b35f9daaa544a71187
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 erg712862.714.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712862.714.pkg.Z
# pkgadd -d /var/spool/pkg/erg712862.714.pkg
5. UnixWare 7.1.3
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31
5.2 Verification
MD5 (erg712862.713.pkg.Z) = 63ed84f84943604a992a1a555ad393f1
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 erg712862.713.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712862.713.pkg.Z
# pkgadd -d /var/spool/pkg/erg712862.713.pkg
6. UnixWare 7.1.1
6.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2005.31
6.2 Verification
MD5 (erg712862.711.pkg.Z) = 4ca1b39e940c2bbff8510027951efe5b
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
6.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
Download erg712862.711.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg712862.711.pkg.Z
# pkgadd -d /var/spool/pkg/erg712862.711.pkg
7. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-CAN-2005-2132
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 sr894043 fz532477
erg712862.
8. 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.
9. Acknowledgments
The SCO Group would like to thank Yun Jonglim for his work
in discovering and describing this defect so well.
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