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Category:   Application (Generic)  >   Ppp Vendors:   Caldera/SCO
'ppptalk' Utility on Caldera (SCO) UnixWare and Open UNIX Lets Local Users Grab Root Privileges
SecurityTracker Alert ID:  1004583
SecurityTracker URL:  http://securitytracker.com/id/1004583
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 19 2002
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Caldera reported a vulnerability in 'ppptalk' as distributed on their UnixWare/Open UNIX operating system. A local user may be able to gain root privileges on the system.

It is reported that when pppd is running (which is the default configuration), a local user can exploit /usr/bin/ppptalk to gain root privileges. This utility is configured with set user id (suid) root privileges.

No further details were provided.

Impact:   A local user can obtain root privileges.
Solution:   The vendor has released a fix.

For UnixWare 7.1.1:

Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27

Verification

MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

Installing Fixed Binaries

Upgrade the affected binaries with the following commands:

Download erg712071.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712071.pkg.Z
# pkgadd -d /var/spool/pkg/erg712071.pkg


For Open UNIX 8.0.0:

Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27

Verification

MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

Installing Fixed Binaries

Upgrade the affected binaries with the following commands:

Download erg712071.pkg.Z to the /var/spool/pkg directory

# uncompress /var/spool/pkg/erg712071.pkg.Z
# pkgadd -d /var/spool/pkg/erg712071.pkg

Vendor URL:  www.caldera.com/support/security/index.html (Links to External Site)
Cause:   Not specified
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  UnixWare 7.1.1, Open UNIX 8.0.0

Message History:   None.


 Source Message Contents

Subject:  Security Update: [CSSA-2002-SCO.27] UnixWare 7.1.1 Open UNIX 8.0.0 : ppptalk root privilege vulnerability


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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca

______________________________________________________________________________

		Caldera International, Inc.  Security Advisory

Subject:		UnixWare 7.1.1 Open UNIX 8.0.0 : ppptalk root privilege vulnerability
Advisory number: 	CSSA-2002-SCO.27
Issue date: 		2002 June 18
Cross reference:
______________________________________________________________________________


1. Problem Description

	If pppd is running (which it is on a default installation),
	a malicious user can use /usr/bin/ppptalk (or its link,
	/usr/bin/ppp), to gain root privileges.


2. Vulnerable Supported Versions

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


3. Solution

	The proper solution is to install the latest packages.
	However, removing the setuid bits from the /etc/ppptalk
	binary will effectively eliminate the vulnerability.


4. UnixWare 7.1.1

	4.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27


	4.2 Verification

	MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

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


	4.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following commands:

	Download erg712071.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712071.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712071.pkg


5. Open UNIX 8.0.0

	5.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenUNIX/CSSA-2002-SCO.27


	5.2 Verification

	MD5 (erg712071.pkg.Z) = 9e353b58860c1b2ab4e831410f44fa12

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


	5.3 Installing Fixed Binaries

	Upgrade the affected binaries with the following commands:

	Download erg712071.pkg.Z to the /var/spool/pkg directory

	# uncompress /var/spool/pkg/erg712071.pkg.Z
	# pkgadd -d /var/spool/pkg/erg712071.pkg


6. References

	Specific references for this advisory:
		none

	Caldera security resources:
		http://www.caldera.com/support/security/index.html

	This security fix closes Caldera incidents sr865661, fz521199
	and erg712071.


7. Disclaimer

	Caldera International, Inc. 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 Caldera products.


______________________________________________________________________________

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