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Home » Hacking News » Connectiva CLA-2003:616: DHCP Denial of Service

Connectiva CLA-2003:616: DHCP Denial of Service

by Nikola Strahija on April 6th, 2003 A vulnerability has been found in the DHCP server which, if exploited, may allow remote attackers to cause Denial of Service condition or misbehaviour of the DHCP server.


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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : dhcp
SUMMARY : Denial of service vulnerability
DATE : 2003-04-04 18:34:00
ID : CLA-2003:616
RELEVANT
RELEASES : 8

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DESCRIPTION
The package "dhcp" provides a Dynamic Host Configuration Protocol[1]
server developed by ISC (ISC DHCPD).

Florian Lohoff discovered[2] a vulnerability[3,4] in the way dhcrelay
(part of the dhcp package) forwards malicious BOOTP packets it
receives to the dhcp servers it contacts. An attacker could exploit
this vulnerability to generate a "storm" of BOOTP packets, causing a
denial of service condition or a misbehavior by the part of the dhcp
server.

The Common Vulnerabilities and Exposures project (cve.mitre.org) is
tracking[5] this issue with the name CAN-2003-0039.

The packages provided with this announcement fix these
vulnerabilities with a patch, keeping the original version. Please
note that Conectiva Linux versions prior to 8 do not ship dhcp 3.0
and therefore are not vulnerable to this problem.


SOLUTION
All dhcp users should upgrade immediately. After upgrading the
packages, please restart the dhcpd service if it is already running.
This can be done with the command below (as the root user):

# service dhcpd restart


REFERENCES:
1.http://www.ietf.org/rfc/rfc2131.txt
2.http://online.securityfocus.com/archive/1/307451
3.http://online.securityfocus.com/bid/6628
4.http://www.kb.cert.org/vuls/id/149953
5.http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0039


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/RPMS/dhcp-3.0-3U80_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/dhcp-doc-3.0-3U80_3cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/dhcp-3.0-3U80_3cl.src.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 reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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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

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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Copyright 2003 (c) Conectiva Inc.
http://www.conectiva.com

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subscribe: [email protected]
unsubscribe: [email protected]
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