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Category:   OS (UNIX)  >   Crontab Vendors:   Caldera/SCO
(Caldera Issues Fix for OpenServer) Re: Caldera (SCO) 'crontab' Format String Bug Lets Local Users Execute Code to Gain Elevated Privileges on the System.
SecurityTracker Alert ID:  1004815
SecurityTracker URL:  http://securitytracker.com/id/1004815
CVE Reference:   CVE-2002-0716   (Links to External Site)
Updated:  Feb 23 2004
Original Entry Date:  Jul 23 2002
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): OpenServer 5.0.5, 5.0.6
Description:   A vulnerability was reported in the Caldera (SCO) OpenServer 'crontab' utility. A local user can gain elevated privileges.

Strategic Reconnaissance Team issued an advisory regarding a format string vulnerability in 'crontab' on Caldera's OpenServer. This application is reported installed with set group id (sgid) 'cron' group privileges.

A local user can execute cronttab with malicious formatting arguments to trigger the bug and possibly cause arbitrary code to be executed. A demonstration exploit example is provided:

$ crontab %x%x%x%x
crontab: cannot open file 8047f08804a5578047cd48047cd4

The report suggests that a user that has obtained 'cron' group privileges can likely obtain higher privileges.

The vendor has reportedly been notified.

Impact:   A local user can execute arbitrary code with elevated group ('cron') privileges.
Solution:   Caldera has issued a fix for OpenServer.

For OpenServer 5.0.5:

Location of Fixed Binaries

ftp://ftp.caldera.com/pub/updates/OpenServer/CSSA-2002-SCO.35


Verification

MD5 (VOL.000.000) = 044edeae4a5db58a5a27078d70bf2060

md5 is available for download from
ftp://ftp.caldera.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.35


Verification

MD5 (VOL.000.000) = 044edeae4a5db58a5a27078d70bf2060

md5 is available for download from
ftp://ftp.caldera.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.caldera.com/support/security/index.html (Links to External Site)
Cause:   Input validation error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 4 2002 Caldera (SCO) 'crontab' Format String Bug Lets Local Users Execute Code to Gain Elevated Privileges on the System.



 Source Message Contents

Subject:  Security Update: [CSSA-2002-SCO.35] OpenServer 5.0.5 OpenServer 5.0.6 : crontab format string vulnerability


--Qbvjkv9qwOGw/5Fx
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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca

______________________________________________________________________________

		Caldera International, Inc.  Security Advisory

Subject:		OpenServer 5.0.5 OpenServer 5.0.6 : crontab format string vulnerability
Advisory number: 	CSSA-2002-SCO.35
Issue date: 		2002 July 22
Cross reference:
______________________________________________________________________________


1. Problem Description

	The crontab program contains a format string vulnerability
	that can be used by a malicious user to execute code to
	gain privilege.


2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.5		/etc/cron
					/usr/bin/at
					/usr/bin/crontab
	OpenServer 5.0.6
					/etc/cron
					/usr/bin/at
					/usr/bin/crontab


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.35


	4.2 Verification

	MD5 (VOL.000.000) = 044edeae4a5db58a5a27078d70bf2060

	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:

	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.35


	5.2 Verification

	MD5 (VOL.000.000) = 044edeae4a5db58a5a27078d70bf2060

	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:

	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:
		Strategic Reconnaissance Team Security Advisory
			(SRT2002-06-04-1611) http://www.snosoft.com

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

	This security fix closes Caldera incidents sr864228, fz520964,
	erg712045.


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.


8. Acknowledgements

	KF (dotslash@snosoft.com) discovered and researched this
	vulnerability.

______________________________________________________________________________

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