full-disclosure - Security Update: [CSSA-2002-SCO.43] UnixWare 7.1.1 Open UNIX 8.0.0 : closed file descriptor race vulnerability

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From: security at caldera.com (security@...dera.com)
Subject: Security Update: [CSSA-2002-SCO.43] UnixWare 7.1.1 Open UNIX 8.0.0 : closed file descriptor race vulnerability

To: bugtraq@...urityfocus.com announce@...ts.caldera.com scoannmod@...itec.on.ca full-disclosure@...ts.netsys.com

______________________________________________________________________________

			SCO Security Advisory

Subject:		UnixWare 7.1.1 Open UNIX 8.0.0 : closed file descriptor race vulnerability
Advisory number: 	CSSA-2002-SCO.43
Issue date: 		2002 December 09
Cross reference:
______________________________________________________________________________


1. Problem Description

	 On current OpenBSD systems, any local user (being or not in
	 the wheel group) can fill the kernel file descriptors table,
	 leading to a denial of service. Because of a flaw in the way
	 the kernel checks closed file descriptors 0-2 when running a
	 setuid program, it is possible to combine these bugs and earn
	 root access by winning a race condition.

	 Since UnixWare does not have a global kernel file descriptors
	 table (it has per-process dynamic file descriptors table), it
	 is not prone to the denial of service attack and the race
	 condition resulting in root exploit.

	 The second problem, however, does exist - closing file
	 descriptors 0, 1 and/or 2 before exec'ing a setuid program
	 can make this program open files under these fds, which have
	 special meanings for libc (stdin/out/err). Reading or writing
	 to root-owned files can be made possible, since
	 stdXX==opened_file.

	 The fix done for BSD is to check (in the kernel) before
	 exec'ing a set[ug]id program if fd 0, 1 and 2 are closed, and
	 if so redirect them to /dev/null. We have done the same fix
	 for UnixWare.

	 This fix will only kick in when an unprivileged process
	 execs a set[ug]id program.

 
2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	UnixWare 7.1.1 			/etc/conf/pack.d/proc/Driver_atup.o
					/etc/conf/pack.d/proc/Driver_mp.o

	Open UNIX 8.0.0 		/etc/conf/pack.d/proc/Driver_atup.o
					/etc/conf/pack.d/proc/Driver_mp.o


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.43


	4.2 Verification

	MD5 (erg712059.711.pkg.Z) = 1545beb0d12890de701e129de54bf7b6

	md5 is available for download from
		ftp://ftp.sco.com/pub/security/tools


	4.3 Installing Fixed Binaries

	*** NOTE: THE UW711M2 SUPPLEMENT MUST BE INSTALLED PRIOR TO
	          APPLYING THIS UPDATE.

	Upgrade the affected binaries with the following sequence:

	Download erg712059.711.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712059.711.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712059.711.pkg


5. Open UNIX 8.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenUNIX/CSSA-2002-SCO.43


	5.2 Verification

	MD5 (erg712059.ou8.pkg.Z) = 9291ab96576e48b55e981190480855ca

	md5 is available for download from
		ftp://ftp.sco.com/pub/security/tools


	5.3 Installing Fixed Binaries

	*** NOTE: THE OU800PK4 SUPPLEMENT MUST BE INSTALLED PRIOR TO
	          APPLYING THIS UPDATE.

	Upgrade the affected binaries with the following sequence:

	Download erg712059.ou8.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712059.ou8.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712059.ou8.pkg


6. References

	Specific references for this advisory:

		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0766

	SCO security resources:

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

	This security fix closes SCO incidents sr865063, fz526562,
	erg712059.


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

	FozZy <fozzy@...france.com>, et al. discovered and researched
	this vulnerability.

______________________________________________________________________________
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