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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
(SCO Issues Fix) OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications
SecurityTracker Alert ID:  1011129
SecurityTracker URL:  http://securitytracker.com/id/1011129
CVE Reference:   CVE-2004-0079, CVE-2004-0081, CVE-2004-0112   (Links to External Site)
Date:  Sep 1 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.6c - 0.9.6k and 0.9.7a - 0.9.7c
Description:   Some vulnerabilities were reported in OpenSSL, primarily involving the processing of SSL/TLS protocol handshakes. A remote user can cause OpenSSL to crash.

It is reported that there is a null-pointer assignment in the do_change_cipher_spec() function [CVE: CVE-2004-0079]. A remote user can perform a specially crafted SSL/TLS handshake with a target server to cause OpenSSL to crash on the target system. This may cause the application using OpenSSL to crash.

All versions of OpenSSL from 0.9.6c to 0.9.6k inclusive and from 0.9.7a to 0.9.7c inclusive are reportedly vulnerable to this null-pointer bug.

It is also reported that there is a flaw in performing SSL/TLS handshakes using Kerberos ciphersuites [CVE: CVE-2004-0112]. A remote user can perform a specially crafted SSL/TLS handshake against a server that is using Kerberos ciphersuites to cause OpenSSL to crash on the target system.

OpenSSL versions 0.9.7a, 0.9.7b, and 0.9.7c are reported to be vulnerable to this Kerberos handshake bug.

It is also reported that a remote user may be able to cause OpenSSL to enter an infinite loop due to a flaw in a patch introduced in 0.9.6d [CVE: CVE-2004-0081].

The vendor credits Dr. Stephen Henson of the OpenSSL core team as well as Codenomicon for supplying their TLS Test Tool and Joe Orton of Red Hat for performing the majority of the testing.

Impact:   A remote user can cause OpenSSL to crash, which may cause an application using OpenSSL to crash. The specific impact depends on the application that uses the OpenSSL library.
Solution:   SCO has issued a fix, described at:

ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.10/SCOSA-2004.10.1.txt

Vendor URL:  www.openssl.org/news/secadv_20040317.txt (Links to External Site)
Cause:   Boundary error, Exception handling error, State error
Underlying OS:  Linux (Caldera/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.
Mar 17 2004 OpenSSL SSL/TLS Handshade Flaws May Let Remote Users Crash OpenSSL-based Applications



 Source Message Contents

Subject:  UPDATED OpenServer 5.0.6 OpenServer 5.0.7 : OpenSSL Multiple Vulnerabilities



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1



______________________________________________________________________________

			SCO Security Advisory

Subject:		UPDATED OpenServer 5.0.6 OpenServer 5.0.7 : OpenSSL Multiple Vulnerabilities
Advisory number: 	SCOSA-2004.10.1
Issue date: 		2004 July 29
Cross reference:	sr890284 fz529412 erg712603 TA04-078A VU#288574 VU#465542 CAN-2004-0079 CAN-2004-0081 CAN-2004-0112
______________________________________________________________________________


1. Problem Description

	OpenSSL implements the Secure Sockets Layer (SSL) and
	Transport Layer Security (TLS) protocols and includes a
	general purpose cryptographic library. SSL and TLS are
	commonly used to provide authentication, encryption,
	integrity, and non-repudiation services to network 
	applications including HTTP, IMAP, POP3, SMTP, and LDAP. 

	The U.K. National Infrastructure Security Co-ordination 
	Centre (NISCC) and the OpenSSL Project have reported several
	vulnerabilities in the OpenSSL SSL/TLS library (libssl). 
	Any application or system that uses this library may be 
	affected. 

	CERT Vulnerability Note VU#288574 
	OpenSSL contains null-pointer assignment in do_change_cipher_spec()
	function 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2004-0079 to this issue. 

	CERT Vulnerability Note VU#465542 
	OpenSSL does not properly handle unknown message types 

	The Common Vulnerabilities and Exposures project (cve.mitre.org) 
	has assigned the name CAN-2004-0081 to this issue.

	CERT Vulnerability Note VU#484726
	OpenSSL does not adequately validate length of Kerberos ticket 
	during SSL/TLS handshake.  

	The Common Vulnerabilities and Exposures project (cve.mitre.org)
        has assigned the name CAN-2004-0112 to this issue.

2. Vulnerable Supported Versions

	System				Binaries
	----------------------------------------------------------------------
	OpenServer 5.0.6 		OpenSSL distribution
	OpenServer 5.0.7 		OpenSSL distribution

3. Solution

	The proper solution is to install the latest packages.

	SCOSA-2004.10 is an update of gwxlibs to version 1.3.3Db.

	A full list of changes to gwxlibs is at 

	ftp://ftp.sco.com/pub/openserver5/507/mp/mp3/osr507mp3.html#rn507mp_gwxlibs
	

4. OpenServer 5.0.6

	4.1 First install oss646c or later

	4.2 Location of oss646c

	ftp://ftp.sco.com/pub/openserver5/oss646c/

	4.3 Verification of oss646c

	MD5 (VOL.000.000) = f19b6c6949f615316bfb075d249989e8
	MD5 (VOL.000.001) = 341ff8553aecd2c7b0c2beaf83030d0f
	MD5 (VOL.000.002) = 6e46708ad8029e12280d4f9ac60ab814
	MD5 (VOL.000.003) = 2868b64a6a6db742adb3b485be645d7e
	MD5 (VOL.000.004) = 1696fe1db9bb063827ee5e76e58dff84
	MD5 (VOL.000.005) = f39da342f8af72fcaccdf478dca04109
	MD5 (VOL.000.006) = 2b31611c8af7d2e7910d6e8e3cf701a6
	MD5 (VOL.000.007) = d0175c0f4e3ed29435b1eab95609f8f4
	MD5 (VOL.000.008) = aa9e8a525c341fed077f981b1dacb486
	MD5 (VOL.000.009) = 8e023af67b57507824406bdda322079a
	MD5 (VOL.000.010) = 2b46e8adba8ae0b64109f2069da978a2

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

	4.4 Installation of oss646c

        See ftp://ftp.sco.com/pub/openserver5/oss646c/oss646c.txt

	4.5 Next install xorg-6.7.0Ba or later

	4.6 Location of xorg-6.7.0Ba

	ftp://ftp.sco.com/pub/openserver5/opensrc/xorg-6.7.0Ba/

	4.7 Verification 

	MD5 (VOL.000.000) = 289d1070c4135e4d25a20501dbca08d8
        MD5 (VOL.000.001) = 4111dadf961d4ef88e89112070f3e811
        MD5 (VOL.000.002) = 4c4cdf4bf4c28045b7b323cfa407829f
        MD5 (VOL.000.003) = d7e8da318d1c4df6fff14f60d993cf45
        MD5 (VOL.000.004) = bfc0571f1fededd1780fafa76db9be90

        4.8 Installation of xorg-6.7.0Ba

        See ftp://ftp.sco.com/pub/openserver5/opensrc/xorg-6.7.0Ba/xorg67_rn.txt

	4.9 Location of OpenSSL Fixed Binaries

	ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.10

	4.10 Verification

	MD5 (VOL.000.000) = a85cf35c417903522392064aaa98f0a4
	MD5 (VOL.000.001) = d4383d6bc74bb6e873e7a4c8dfdc4e6b
	MD5 (VOL.000.002) = c5657b1358ef96177ae15fdcfec7132f
	MD5 (VOL.000.003) = 4c88ceb3502330b4c4d5e07ca7fc5214

	4.11 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

	The fixes are only 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 (507mp3_vol.tar) = c927aefdd50b50aca5d29e08c1562aec

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


	5.3 Installing Fixed Binaries

	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.us-cert.gov/cas/techalerts/TA04-078A.html
		http://www.kb.cert.org/vuls/id/288574
		http://www.kb.cert.org/vuls/id/484726
		http://www.kb.cert.org/vuls/id/465542
		http://www.openssl.org/news/secadv_20040317.txt
		http://www.uniras.gov.uk/vuls/2004/224012/index.htm
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0079
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0112
		http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0081

	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 sr890284 fz529412
	erg712603.

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

	SCO would like to thank The U.K. National Infrastructure
	Security Co-ordination Centre (NISCC) and the OpenSSL team.

______________________________________________________________________________

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