(SCO Issues Fix for UnixWare) Zlib Error Handling Bug in inflate() and inflateBack() Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1011778 |
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SecurityTracker URL: http://securitytracker.com/id/1011778
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CVE Reference:
CAN-2004-0797
(Links to External Site)
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Date: Oct 19 2004
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Impact:
Denial of service via local system, Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.2 - 1.2.1
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Description:
A vulnerability was reported in zlib. A remote user can cause denial of service conditions.
Johan Thelmen reported that a specially crafted file can cause a segmentation fault in zlib.
It is reported that the inflate() and inflateBack() functions do not properly handle errors.
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Impact:
A user can create a file that when processed by zlib, will cause a segmentation fault. The specific impact depends on the application using zlib.
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Solution:
SCO has issued the following fixes.
UnixWare 7.1.4:
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17
Verification:
MD5 (erg712692.714.pkg) = 0b56f889838a2daaed77f8251922391e
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
To upgrade the affected binaries, use the following sequence:
Download erg712692.714.pkg to the /var/spool/pkg directory
# pkgadd -d /var/spool/pkg/erg712692.714.pkg
UnixWare 7.1.3:
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17
Verification:
MD5 (erg712692.pkg) = 5c48d63e7f5922dccf38f6d6fa66b325
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
To upgrade the affected binaries, use the following sequence:
Download erg712692.pkg to the /var/spool/pkg directory
# pkgadd -d /var/spool/pkg/erg712692.pkg
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Vendor URL: www.gzip.org/zlib/ (Links to External Site)
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Cause:
Exception handling error
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Underlying OS:
UNIX (Open UNIX-SCO)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Tue, 19 Oct 2004 00:52:26 -0400
Subject: [none]
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
______________________________________________________________________________
SCO Security Advisory
Subject: UnixWare 7.1.4 UnixWare 7.1.3 : The error handling in the
inflate and inflateBack functions in ZLib compression library allows local users to
cause a denial of service
Advisory number: SCOSA-2004.17
Issue date: 2004 October 18
Cross reference: sr891410 fz530158 erg712692 VU#238678 CAN-2004-0797
______________________________________________________________________________
1. Problem Description
CERT Vulnerability Note VU#238678 Un-handled error conditions
in the zlib compression library may allow an attacker to
cause a denial-of-service condition.
The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the following name
CAN-2004-0797 to this issue.
2. Vulnerable Supported Versions
System Binaries
----------------------------------------------------------------------
UnixWare 7.1.4 /usr/include/zconf.h
/usr/include/zlib.h
/usr/lib/libz.so.1.2.1
UnixWare 7.1.3 /usr/include/zconf.h
/usr/include/zlib.h
/usr/lib/libz.so.1.2.1
3. Solution
The proper solution is to install the latest packages.
4. UnixWare 7.1.4
4.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17
4.2 Verification
MD5 (erg712692.714.pkg) = 0b56f889838a2daaed77f8251922391e
md5 is available for download from
ftp://ftp.sco.com/pub/security/tools
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following sequence:
Download erg712692.714.pkg to the /var/spool/pkg directory
# pkgadd -d /var/spool/pkg/erg712692.714.pkg
5. UnixWare 7.1.3
5.1 Location of Fixed Binaries
ftp://ftp.sco.com/pub/updates/UnixWare/SCOSA-2004.17
5.2 Verification
MD5 (erg712692.pkg) = 5c48d63e7f5922dccf38f6d6fa66b325
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:
Download erg712692.pkg to the /var/spool/pkg directory
# pkgadd -d /var/spool/pkg/erg712692.pkg
6. References
Specific references for this advisory:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0797
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 sr891410 fz530158
erg712692.
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 Johan Thelmen for his help in finding
and fixing this bug.
______________________________________________________________________________
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