(Conectiva Issues Fix) Squid SNMP Parsing Error Lets Remote Users Restart the Proxy Server
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SecurityTracker Alert ID: 1012068
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SecurityTracker URL: http://securitytracker.com/id?1012068
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CVE Reference: CAN-2004-0918
(Links to External Site)
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Date: Nov 3 2004
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Impact: Denial of service via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): 2.5-STABLE6, 3.0-PRE3-20040702; when compiled with SNMP support
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Description: iDEFENSE reported a vulnerability in Squid in the SNMP service. A remote user can cause denial of service conditions.
It is reported that a remote user can supply a specially crafted SNMP packet to trigger an ASN1 parsing error and cause Squid to
restart, dropping all current connections.
The flaw resides in the asn_parse_header() function in 'snmplib/asn1.c'.
The system
is affected if compiled with SNMP support.
The vendor was notified on September 15, 2004.
The original advisory is available
at:
http://www.idefense.com/application/poi/display?id=152&type=vulnerabilities
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Impact: A remote user can cause the proxy services to restart.
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Solution: Conectiva has released a fix.
ftp://atualizacoes.conectiva.com.br/10/SRPMS/squid-2.5.5-63116U10_4cl.src.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-2.5.5-631
16U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-auth-2.5.5-63116U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-extra-templates-
2.5.5-63116U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/squid-2.5.5-25761U90_7cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-2.5.5-25761U90
_7cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-auth-2.5.5-25761U90_7cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-extra-templates-2.5.5-2
5761U90_7cl.i386.rpm
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Vendor URL: www.squid-cache.org/ (Links to External Site)
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Cause: Exception handling error, Input validation error
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Underlying OS: Linux (Conectiva)
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Underlying OS Comments: 9, 10
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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: Wed, 3 Nov 2004 10:48:39 -0200
From: Conectiva Updates <secure@conectiva.com.br>
Subject: [Conectiva-updates] [CLA-2004:882] Conectiva Security Announcement
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT
- --------------------------------------------------------------------------
PACKAGE : squid
SUMMARY : Fixes for squid vulnerabilities
DATE : 2004-11-03 10:48:00
ID : CLA-2004:882
RELEVANT
RELEASES : 9, 10
- -------------------------------------------------------------------------
DESCRIPTION
Squid[1] is a full-featured web proxy cache.
This announcement fixes a denial of service vulnerability[2] in squid
caused by a malformed NTLMSSP packet. This causes a negative value to
be passed to memcpy on servers with NTLM authentication enabled,
making squid abort and causing a denial of service condition.
Fixes for two segmentation faults were also included: when using a
blank user name in digest authentication[3] and after the message
"Likely proxy abuse detected" has been printed to cache.log[4].
Also fixes a denial of service situation[5] caused by certain
malformed SNMP requests that when received by squid could restart it
with a segmentation fault error.
For Conectiva Linux 9, this announcement also fixes a buffer overflow
vulnerability[6] in the ntlm_check_auth (NTLM authentication)
function that allowed remote attackers to execute arbitrary code via
a long password.
SOLUTION
It is recommended that all squid users upgrade to the latest
packages. This update will automatically restart the service if it is
already running.
REFERENCES
1.http://squid.nlanr.net/
2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0832
3.http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE5-digest_blank
4.http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE5-proxy_abuse
5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0918
6.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0541
UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/10/SRPMS/squid-2.5.5-63116U10_4cl.src.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-2.5.5-63116U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-auth-2.5.5-63116U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/10/RPMS/squid-extra-templates-2.5.5-63116U10_4cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/squid-2.5.5-25761U90_7cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-2.5.5-25761U90_7cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-auth-2.5.5-25761U90_7cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/squid-extra-templates-2.5.5-25761U90_7cl.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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