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______________________________________________________________________________

			SCO Security Advisory

Subject:		UnixWare 7.1.1 Open UNIX 8.0.0 : uudecode performs inadequate checks on user-specified output files
Advisory number: 	CSSA-2002-SCO.44
Issue date: 		2002 December 11
Cross reference:
______________________________________________________________________________


1. Problem Description

	 From CERT VU#336083:

	 If an attacker can convince a user to invoke uudecode on a
	 malicious file without reviewing the included file name, the
	 attacker can cause the user to overwrite any file accessible
	 by the user. If the victim user has root privileges, the
	 attacker can exploit this vulnerability to overwrite
	 arbitrary files. With respect to symbolic links and named
	 pipes, attackers who exploit this vulnerability can alter the
	 normal operation of system scripts and running processes,
	 significantly increasing the risk of system compromise.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	UnixWare 7.1.1			/usr/bin/uudecode
	Open UNIX 8.0.0			/usr/bin/uudecode


3. Solution

	The proper solution is to install the latest packages.


4. UnixWare 7.1.1

	4.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.44


	4.2 Verification

	MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d

	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 erg712093.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712093.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712093.pkg


5. Open UNIX 8.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.44


	5.2 Verification

	MD5 (erg712093.pkg.Z) = e893c7c27e181a576fa2289ee807884d

	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 erg712093.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712093.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712093.pkg


6. References

	Specific references for this advisory:

		 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0178
		 http://www.kb.cert.org/vuls/id/336083
		 http://www.aerasec.de/security/index.html?id=ae-200204-033&lang=en

	SCO security resources:

		http://www.sco.com/support/security/index.html

	This security fix closes SCO incidents sr866875, fz521051,
	erg712093.


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. Acknowledgements

	 AERAsec discovered and researched this vulnerability.

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