Date: 11 January 2006
References: ESB-2004.0540 ESB-2005.0496
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AUSCERT External Security Bulletin Redistribution
ESB-2006.0024 -- [SCO]
Zlib Multiple Vulnerabilities
11 January 2006
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AusCERT Security Bulletin Summary
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Product: zlib
Publisher: SCO
Operating System: SCO OpenServer 5.0.6, 5.0.7 and 6.0.0
Impact: Denial of Service
Access: Remote/Unauthenticated
CVE Names: CVE-2005-2096 CVE-2005-1849 CVE-2004-0797
Ref: ESB-2004.0540
ESB-2005.0496
Original Bulletin:
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.6/SCOSA-2006.6.txt
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______________________________________________________________________________
SCO Security Advisory
Subject: OpenServer 5.0.6 OpenServer 5.0.7 OpenServer 6.0.0 : Zlib Multiple Vulnerabilities
Advisory number: SCOSA-2006.6
Issue date: 2006 January 10
Cross reference: sr894696 fz532828 erg712900 sr894695 fz532829 erg712899
CVE-2004-0797 CVE-2005-1849 CVE-2005-2096
______________________________________________________________________________
1. Problem Description
The error handling in the (1) inflate and (2) inflateBack
functions in ZLib compression library 1.2.x allows local users
to cause a denial of service (application crash).
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2004-0797 to this issue.
inftrees.h in zlib 1.2.2 allows remote attackers to cause a
denial of service (application crash) via an invalid file that
causes a large dynamic tree to be produced.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2005-1849 to this issue.
Buffer overflow in zlib 1.2 and later versions allows remote
attackers to cause a denial of service (crash) via a crafted
compressed stream, as demonstrated using a crafted PNG file.
The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CVE-2005-2096 to this issue.
2. Vulnerable Supported Versions
System Binaries
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OpenServer 5.0.6 /usr/lib/libz.so.1
OpenServer 5.0.7 /usr/lib/libz.so.1
OpenServer 6.0.0 /usr/lib/libz.so.1
/osr5/usr/lib/libz.so.1
3. Solution
The proper solution is to install the latest packages.
4. OpenServer 5.0.6
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/openserver5/opensrc/gwxlibs-2.1.0Ba/
4.2 Verification
MD5 (gwxlibs210Ba_vol.tar) = 18213632bd0c5ff1e260eac90aae7033
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
Please see the following:
ftp://ftp.sco.com/pub/openserver5/opensrc/gwxlibs-2.1.0Ba/gwxlibs-2.1.0Ba.txt
5. OpenServer 5.0.7
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/openserver5/507/mp/osr507mp4/osr507mp4_vol.tar
5.2 Verification
MD5 (osr507mp4_vol.tar) = 4c87d840ff5b43221258547d19030228
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
5.3 Installing Fixed Binaries
Please see the SCO OpenServer Release 5.0.7 Maintenance Pack 4 Release
and Installation Notes:
ftp://ftp.sco.com/pub/openserver5/507/mp/osr507mp4/osr507mp4.htm
6. OpenServer 6.0.0
6.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2006.6
6.2 Verification
MD5 (VOL.000.000) = b077f94a0d35829500695abb703aa408
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
6.3 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.
7. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0797
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1849
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-2096
http://www.kb.cert.org/vuls/id/238678
http://www.kb.cert.org/vuls/id/680620
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 sr894696 fz532828
erg712900 sr894695 fz532829 erg712899.
8. 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.
9. Acknowledgments
The SCO Group would like to thank Mark Adler for his research.
______________________________________________________________________________
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