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UNIRAS Brief - 589/05 - SCO - UnixWare: RPCBind updated to prevent remote Denial of Service attack



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 589/05 dated 28.07.05  Time: 16:05  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====
SCO - UnixWare: RPCBind updated to prevent remote Denial of Service attack


Detail
====== 

______________________________________________________________________________

			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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contained in this Briefing. 
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<End of UNIRAS Briefing>

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