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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
(SCO Issues Fix for OpenServer) Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges
SecurityTracker Alert ID:  1010811
SecurityTracker URL:  http://securitytracker.com/id/1010811
CVE Reference:   CVE-2003-0694   (Links to External Site)
Date:  Jul 29 2004
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.12.9 and prior versions
Description:   A vulnerability was reported in Sendmail. A local or remote user may be able to execute arbitrary code on the target system.

It is reported that the prescan() function in 'parseaddr.c' contains a flaw [that is different than previously reported prescan flaw]. The report states that various exploit methods are possible, but these exploit methods were not disclosed.

The report indicates that it is confirmed that a local user can exploit this flaw and it is believed that a remote user may also exploit this flaw.

Impact:   A local or remote user may be able to execute arbitrary code with the privileges of the sendmail process.
Solution:   SCO has issued the following fixes.

OpenServer 5.0.6:

First install OSS646B or later - Execution Environment Supplement:

ftp://ftp.sco.com/pub/openserver5/oss646b

Location of Fixed Binaries:

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

Verification:

MD5 (VOL.000.000) = ff18b1666956ea57c9d54008c6ee9444

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to a directory

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


For OpenServer 5.0.7:

Location of Fixed Binaries:

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

The fixes are also available in SCO OpenServer Release 5.0.7 Maintenance Pack 3 or later:

http://www.sco.com/support/update/download/osr507list.html.

Verification:

MD5 (VOL.000.000) = ff18b1666956ea57c9d54008c6ee9444

MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

Upgrade the affected binaries with the following sequence:

1) Download the VOL* files to a directory

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

Or see the Maintenance Pack 3 Release and Installation Notes at:

ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt

Vendor URL:  www.sendmail.org/8.12.10.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (Open UNIX-SCO)
Underlying OS Comments:  OpenServer 5.0.6, 5.0.7

Message History:   This archive entry is a follow-up to the message listed below.
Sep 17 2003 Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges



 Source Message Contents

Subject:  OpenServer 5.0.6 OpenServer 5.0.7 : Multiple Vulnerabilities in Sendmail



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______________________________________________________________________________

			SCO Security Advisory

Subject:		OpenServer 5.0.6 OpenServer 5.0.7 : Multiple Vulnerabilities in Sendmail
Advisory number: 	SCOSA-2004.11
Issue date: 		2004 July 28
Cross reference:	sr876461 fz527630 erg712277 CAN-2003-0161 CA-2003-12 
			sr884730 fz528323 erg712435 CAN-2003-0694 CA-2003-25
______________________________________________________________________________


1. Problem Description

	CERT Advisory CA-2003-12 

	There is a vulnerability in sendmail that can be exploited 
	to cause a denial-of-service condition and could allow a 
	remote attacker to execute arbitrary code with the privileges 
	of the sendmail daemon, typically root.

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CAN-2003-0161 to this issue.

	CERT Advisory CA-2003-25

	The prescan function in Sendmail 8.12.9 allows remote attackers 
	to execute arbitrary code via buffer overflow attacks, as 
	demonstrated using the parseaddr function in parseaddr.c.

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CAN-2003-0694 to this issue.

2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.6 		Sendmail distribution
	OpenServer 5.0.7 		Sendmail distribution	

3. Solution

	The proper solution is to install the latest packages.


4. OpenServer 5.0.6

	4.1  First install OSS646B or later - Execution Environment Supplement

        ftp://ftp.sco.com/pub/openserver5/oss646b

	4.2 Location of Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

	4.3 Verification

	MD5 (VOL.000.000) = ff18b1666956ea57c9d54008c6ee9444

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

	4.4 Installing Fixed Binaries

	Upgrade the affected binaries with the following sequence:

	1) Download the VOL* files to a directory

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


5. OpenServer 5.0.7

	5.1 Location of Fixed Binaries

        ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.11

        The fixes are also available in SCO OpenServer Release 5.0.7 
        Maintenance Pack 3 or later.  See
        http://www.sco.com/support/update/download/osr507list.html.

	5.2 Verification

	MD5 (VOL.000.000)    = ff18b1666956ea57c9d54008c6ee9444

	MD5 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

	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 sequence:

        1) Download the VOL* files to a directory

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

	Or see the Maintenance Pack 3 Release and Installation Notes at

	ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.txt


6. References

	Specific references for this advisory:
		http://www.cert.org/advisories/CA-2003-12.html 
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0161 
		http://www.kb.cert.org/vuls/id/897604
		http://www.cert.org/advisories/CA-2003-25.html
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0694
		http://www.kb.cert.org/vuls/id/784980

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

	SCO security advisories via email
		http://www.sco.com/support/forums/security.html

	This security fix closes SCO incidents sr876461 fz527630
	erg712277 sr884730 fz528323 erg712435.


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. Acknowledgments

	Michal Zalewski <lcamtuf@ghettot.org> discovered and
	researched these issues. Thanks to Eric Allman, Claus 
	Assmann, Greg Shapiro, and Dave Anderson of Sendmail

______________________________________________________________________________

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