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From: security at caldera.com (security@...dera.com)
Subject: Security Update: [CSSA-2002-039.0] Linux: bzip2 file creation and symbolic link vulnerabilities

To: bugtraq@...urityfocus.com announce@...ts.caldera.com security-alerts@...uxsecurity.com full-disclosure@...ts.netsys.com


______________________________________________________________________________

			SCO Security Advisory

Subject:		Linux: bzip2 file creation and symbolic link vulnerabilities 
Advisory number: 	CSSA-2002-039.0
Issue date: 		2002 October 29
Cross reference:
______________________________________________________________________________


1. Problem Description

	From the CVE Archives:

	bzip2 does not use the O_EXCL flag to create files during
	decompression and does not warn the user if an existing file
	would be overwritten, which could allow attackers to overwrite
	files via a bzip2 archive.

	bzip2 decompresses files with world-readable permissions
	before setting the permissions to what is specified in the
	bzip2 archive, which could allow local users to read the files
	as they are being decompressed.

	bzip2 uses the permissions of symbolic links instead of the
	actual files when creating an archive, which could cause the
	files to be extracted with less restrictive permissions than
	intended.


2. Vulnerable Supported Versions

	System				Package
	----------------------------------------------------------------------

	OpenLinux 3.1.1 Server		prior to bzip2-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-static-1.0.0-7MR.i386.rpm

	OpenLinux 3.1.1 Workstation	prior to bzip2-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-static-1.0.0-7MR.i386.rpm

	OpenLinux 3.1 Server		prior to bzip2-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-static-1.0.0-7MR.i386.rpm

	OpenLinux 3.1 Workstation	prior to bzip2-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-1.0.0-7MR.i386.rpm
					prior to bzip2-devel-static-1.0.0-7MR.i386.rpm


3. Solution

	The proper solution is to install the latest packages. Many
	customers find it easier to use the Caldera System Updater, called
	cupdate (or kcupdate under the KDE environment), to update these
	packages rather than downloading and installing them by hand.


4. OpenLinux 3.1.1 Server

	4.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2002-039.0/RPMS

	4.2 Packages

	d54e80dafe3006f18d1d9498078f4bce	bzip2-1.0.0-7MR.i386.rpm
	7eb4a45c2aa65aafd69fd1ef047e1bfd	bzip2-devel-1.0.0-7MR.i386.rpm
	b4f91ed45d1e94b2547ce0950b0f49be	bzip2-devel-static-1.0.0-7MR.i386.rpm

	4.3 Installation

	rpm -Fvh bzip2-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-static-1.0.0-7MR.i386.rpm

	4.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2002-039.0/SRPMS

	4.5 Source Packages

	8174f956fc4fba3686900cf77ceabf44	bzip2-1.0.0-7MR.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2002-039.0/RPMS

	5.2 Packages

	e15555947c16f663962f38bae73ceb4a	bzip2-1.0.0-7MR.i386.rpm
	a1d3bf363951dddc3eb745d4b23e7513	bzip2-devel-1.0.0-7MR.i386.rpm
	19c8036ab3d61a96c0c09f0c08c78f3b	bzip2-devel-static-1.0.0-7MR.i386.rpm

	5.3 Installation

	rpm -Fvh bzip2-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-static-1.0.0-7MR.i386.rpm

	5.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2002-039.0/SRPMS

	5.5 Source Packages

	d428ed2e4ea3f3577c8ff7fa6d7be12e	bzip2-1.0.0-7MR.src.rpm


6. OpenLinux 3.1 Server

	6.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2002-039.0/RPMS

	6.2 Packages

	525d5fe90e5b5aee993e46c665f51ab3	bzip2-1.0.0-7MR.i386.rpm
	ec675b025cbae2d59755ce84dc440478	bzip2-devel-1.0.0-7MR.i386.rpm
	4a82220ccec70af0a501cd3c1695a2bc	bzip2-devel-static-1.0.0-7MR.i386.rpm

	6.3 Installation

	rpm -Fvh bzip2-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-static-1.0.0-7MR.i386.rpm

	6.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Server/CSSA-2002-039.0/SRPMS

	6.5 Source Packages

	14622634fec6589268c083a375fa50e6	bzip2-1.0.0-7MR.src.rpm


7. OpenLinux 3.1 Workstation

	7.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2002-039.0/RPMS

	7.2 Packages

	845b6f3c541e902c8a0737694a3e5e42	bzip2-1.0.0-7MR.i386.rpm
	f7e1a4fe5697067d4acd8f87309dc032	bzip2-devel-1.0.0-7MR.i386.rpm
	99e7937248d59ba576967c40469590d9	bzip2-devel-static-1.0.0-7MR.i386.rpm

	7.3 Installation

	rpm -Fvh bzip2-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-1.0.0-7MR.i386.rpm
	rpm -Fvh bzip2-devel-static-1.0.0-7MR.i386.rpm

	7.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1/Workstation/CSSA-2002-039.0/SRPMS

	7.5 Source Packages

	654e85390b806e357e881189b2968b2d	bzip2-1.0.0-7MR.src.rpm


8. References

	Specific references for this advisory:
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0759
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0760
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0761

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

	This security fix closes SCO incidents sr864842, fz521049,
	erg712052.


9. 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.


10. Acknowledgements

	Volker Schmidt and Philippe Troin discovered and researched
	these vulnerabilities.

______________________________________________________________________________
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