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Category:   OS (UNIX)  >   ypxfrd Vendors:   Caldera/SCO
(Caldera Issues Fix for OpenServer) 'ypxfrd' Daemon Flaw May Disclose Files to Local or Remote Users
SecurityTracker Alert ID:  1005406
SecurityTracker URL:  http://securitytracker.com/id/1005406
CVE Reference:   CVE-2002-1199   (Links to External Site)
Updated:  Dec 15 2003
Original Entry Date:  Oct 11 2002
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): OpenServer 5.0.5 OpenServer 5.0.6
Description:   A vulnerability was reported in the ypxfrd NIS map transfer daemon in several UNIX-based operating systems. A local or remote user can view any file on the system.

It is reported that the daemon does not properly validate user-supplied arguments. When the getdbm procedure is called, the ypxfrd daemon reportedly creates a path to the /var/yp/domain/map file, with the 'domain' and 'map' arguments provided by the local user. The software does not filter the arguments for directory traversal characters. A local user can supply a path name to a symbolic link (that is linked to a critical file on the system) to be able to read any file on the system.

Depending on the ypxfrd configuration, a remote user may be able to access files located outside of the /var/yp directory.

According to reports, the following operating systems are known to be affected: Caldera (SCO) OpenServer, Caldera OpenLinux, HP-UX, HP Tru64 UNIX, IBM AIX, and Sun Solaris.

Impact:   A remote user may be able to view files on the YP server. A local user may be able to view files with elevated privileges.
Solution:   Caldera has released a fix for OpenServer.

For OpenServer 5.0.5:

Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.40


Verification

MD5 (VOL.000.000) = 62683d366d60f0a4e61bc51c32355c6a

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


Installing Fixed Binaries

Upgrade the affected binaries with the following commands:

1) Download the VOL* files to the /tmp directory

Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.


For OpenServer 5.0.6:

Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.40


Verification

MD5 (VOL.000.000) = 62683d366d60f0a4e61bc51c32355c6a

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


Installing Fixed Binaries

Upgrade the affected binaries with the following commands:

1) Download the VOL* files to the /tmp directory

Run the custom command, specify an install from media images, and specify the /tmp directory as the location of the images.

Vendor URL:  www.sco.com/support/security/index.html (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (Open UNIX-SCO)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 9 2002 'ypxfrd' Daemon Flaw May Disclose Files to Local or Remote Users



 Source Message Contents

Subject:  Security Update: [CSSA-2002-SCO.40] OpenServer 5.0.5 OpenServer 5.0.6 : ypxfrd remote file access vulnerability


--GPJrCs/72TxItFYR
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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca full-disclosure@lists.netsys.com

______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : ypxfrd remote file access vulnerability
Advisory number: 	CSSA-2002-SCO.40
Issue date: 		2002 October 10
Cross reference:
______________________________________________________________________________


1. Problem Description

	There is a vulnerability in ypxfrd that allows a local user
	(possibly remote) to read any file on a system running the
	daemon.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.5		/etc/ypxfrd
	OpenServer 5.0.6		/etc/ypxfrd


3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.5

	4.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.40


	4.2 Verification

	MD5 (VOL.000.000) = 62683d366d60f0a4e61bc51c32355c6a

	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 commands:

	1) Download the VOL* files to the /tmp directory

	Run the custom command, specify an install from media images,
	and specify the /tmp directory as the location of the images.


5. OpenServer 5.0.6

	5.1 Location of Fixed Binaries

	ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.40


	5.2 Verification

	MD5 (VOL.000.000) = 62683d366d60f0a4e61bc51c32355c6a

	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 commands:

	1) Download the VOL* files to the /tmp directory

	Run the custom command, specify an install from media images,
	and specify the /tmp directory as the location of the images.


6. References

	Specific references for this advisory:
		http://www.kb.cert.org/vuls/id/538033
		http://isec.pl/vulnerabilities/0006.txt

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

	This security fix closes SCO incidents sr868669, fz525993,
	erg712121.


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

	Janusz Niewiadomski <funkysh@isec.pl> of iSEC Security
	Research discovered and researched this vulnerability.

______________________________________________________________________________

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