Ubuntu 6.06 LTS / 8.04 LTS / 8.10 / 9.04 : dhcp3 vulnerability (USN-803-1)

Critical Nessus Plugin ID 39800


The remote Ubuntu host is missing one or more security-related patches.


It was discovered that the DHCP client as included in dhcp3 did not verify the length of certain option fields when processing a response from an IPv4 dhcp server. If a user running Ubuntu 6.06 LTS or 8.04 LTS connected to a malicious dhcp server, a remote attacker could cause a denial of service or execute arbitrary code as the user invoking the program, typically the 'dhcp' user. For users running Ubuntu 8.10 or 9.04, a remote attacker should only be able to cause a denial of service in the DHCP client. In Ubuntu 9.04, attackers would also be isolated by the AppArmor dhclient3 profile.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected packages.

Plugin Details

Severity: Critical

ID: 39800

File Name: ubuntu_USN-803-1.nasl

Version: $Revision: 1.10 $

Type: local

Agent: unix

Published: 2009/07/15

Modified: 2016/05/27

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:dhcp-client, p-cpe:/a:canonical:ubuntu_linux:dhcp3-client, p-cpe:/a:canonical:ubuntu_linux:dhcp3-client-udeb, p-cpe:/a:canonical:ubuntu_linux:dhcp3-common, p-cpe:/a:canonical:ubuntu_linux:dhcp3-dev, p-cpe:/a:canonical:ubuntu_linux:dhcp3-relay, p-cpe:/a:canonical:ubuntu_linux:dhcp3-server, p-cpe:/a:canonical:ubuntu_linux:dhcp3-server-ldap, cpe:/o:canonical:ubuntu_linux:6.06:-:lts, cpe:/o:canonical:ubuntu_linux:8.04:-:lts, cpe:/o:canonical:ubuntu_linux:8.10, cpe:/o:canonical:ubuntu_linux:9.04

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Patch Publication Date: 2009/07/14

Reference Information

CVE: CVE-2009-0692

USN: 803-1

CWE: 119