(Conectiva Issues Fix) Zlib Error Handling Bug in inflate() and inflateBack() Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1012715
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SecurityTracker URL: http://securitytracker.com/id?1012715
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CVE Reference: CAN-2004-0797
(Links to External Site)
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Date: Dec 29 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: Conectiva has released a fix.
ftp://atualizacoes.conectiva.com.br/10/SRPMS/libz1-1.2.1-47972U10_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz-devel-1.2.
1-47972U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz-devel-static-1.2.1-47972U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz1-1.2.
1-47972U10_1cl.i386.rpm
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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: Linux (Conectiva)
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Reported By: Conectiva Updates <secure@conectiva.com.br>
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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: Mon, 13 Sep 2004 12:11:21 -0300
From: Conectiva Updates <secure@conectiva.com.br>
Subject: [Conectiva-updates] [CLA-2004:865] Conectiva Security Announcement
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT
- --------------------------------------------------------------------------
PACKAGE : zlib
SUMMARY : Fix for denial of service vulnerabilities
DATE : 2004-09-13 12:11:00
ID : CLA-2004:865
RELEVANT
RELEASES : 10
- -------------------------------------------------------------------------
DESCRIPTION
"zlib"[1] is a compression library used by several programs.
Due to a Debian bug report[2], a denial of service vulnerability[2]
was discovered in the zlib compression library versions 1.2.x, in the
inflate() and inflateBack() functions. An attacker could exploit
this vulnerability to launch a denial of service attack on any
application using the zlib library. Older versions of zlib are not
affected.
SOLUTION
It is recommended that all Conectiva Linux users upgrade their
packages.
IMPORTANT: all applications linked against zlib must be restarted
after the upgrade in order to close the vulnerabilities.
REFERENCES
1.http://www.gzip.org/zlib/
2.http://bugs.debian.org/252253
3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0797
UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/10/SRPMS/libz1-1.2.1-47972U10_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz-devel-1.2.1-47972U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz-devel-static-1.2.1-47972U10_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/libz1-1.2.1-47972U10_1cl.i386.rpm
ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:
- run: apt-get update
- after that, execute: apt-get upgrade
Detailed instructions regarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en
- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en
- -------------------------------------------------------------------------
Copyright (c) 2004 Conectiva Inc.
http://www.conectiva.com
- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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