SecurityTracker: (SCO Issues Fix for OpenLinux) Re: Webmin Input Validation Flaw in 'miniserv.pl' May Let Remote Users Spoof Session IDs and Gain Root Access



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			SCO Security Advisory

Subject:		OpenLinux: Webmin/Usermin Session ID Spoofing Vulnerability
Advisory number: 	CSSA-2003-035.0
Issue date: 		2003 November 17
Cross reference:	sr882687 fz528142 erg712377 CAN-2003-0101
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1. Problem Description

	Webmin is a web-based system administration tool for Unix. Usermin
	is a web interface that allows all users on a Unix system to
	easily receive mails and to perform SSH and mail forwarding
	configuration. 

	Internal communication between the parent process and the child 
	process using named pipes occur in these software packages during 
	creation or verification of a session ID, or during the setting 
	process of password timeouts. Because the control characters 
	contained in the data passed as authentication information are 
	not eliminated, it is possible to make Webmin and Usermin to 
	acknowledge the combination of any user and session ID specified 
	by an attacker. If the attacker could log into Webmin by using this 
	problem, there is a possibility that arbitrary commands may be 
	executed with root privileges. 

	The Common Vulnerabilities and Exposures (CVE) project has
        assigned the name CAN-2003-0101 to this issue. This is a
        candidate for inclusion in the CVE list (http://cve.mitre.org),
        which standardizes names for security problems.

	CAN-2003-0101 miniserv.pl in Webmin before 1.070 and Usermin before 
	1.000 does not properly handle metacharacters such as line feeds and 
	carriage returns (CRLF) in Base-64 encoded strings during Basic 
	authentication, which allows remote attackers to spoof a session ID 
	and gain root privileges.


2. Vulnerable Supported Versions

	System				Package
	----------------------------------------------------------------------
	OpenLinux 3.1.1 Server		prior to webmin-0.89-12.i386.rpm
	OpenLinux 3.1.1 Workstation	prior to webmin-0.89-12.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-2003-035.0/RPMS

	4.2 Packages

	859d9998141394dc96f338087633814b	webmin-0.89-12.i386.rpm

	4.3 Installation

	rpm -Fvh webmin-0.89-12.i386.rpm

	4.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Server/CSSA-2003-035.0/SRPMS

	4.5 Source Packages

	81c76fa65b710248c8108ea17740d88d	webmin-0.89-12.src.rpm


5. OpenLinux 3.1.1 Workstation

	5.1 Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-035.0/RPMS

	5.2 Packages

	2c9048c8c623a9268b5233766890ea1c	webmin-0.89-12.i386.rpm

	5.3 Installation

	rpm -Fvh webmin-0.89-12.i386.rpm

	5.4 Source Package Location

	ftp://ftp.sco.com/pub/updates/OpenLinux/3.1.1/Workstation/CSSA-2003-035.0/SRPMS

	5.5 Source Packages

	cda66a1795a1a3914041ae920a245381	webmin-0.89-12.src.rpm


6. References

	Specific references for this advisory:
		http://www.lac.co.jp/security/english/snsadv_e/53_e.html
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0101


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

	This security fix closes SCO incidents sr882687 fz528142 erg712377.


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

	SCO would like to thank Keigo Yamazaki and Jamie Cameron for 	
	reporting this issue.

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