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Ubuntu 8.10 / 9.04 / 9.10 : dhcp3 vulnerability (USN-803-2)

critical Nessus Plugin ID 44326

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Synopsis

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

Description

USN-803-1 fixed a vulnerability in Dhcp. Due to an error, the patch to fix the vulnerability was not properly applied on Ubuntu 8.10 and higher. Even with the patch improperly applied, the default compiler options reduced the vulnerability to a denial of service.
Additionally, in Ubuntu 9.04 and higher, users were also protected by the AppArmor dhclient3 profile. This update fixes the problem.

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.

Solution

Update the affected packages.

See Also

https://usn.ubuntu.com/803-2/

Plugin Details

Severity: Critical

ID: 44326

File Name: ubuntu_USN-803-2.nasl

Version: 1.13

Type: local

Agent: unix

Published: 1/28/2010

Updated: 1/2/2019

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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:8.10, cpe:/o:canonical:ubuntu_linux:9.04, cpe:/o:canonical:ubuntu_linux:9.10

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/27/2010

Reference Information

CVE: CVE-2009-0692

BID: 35668

CWE: 119

USN: 803-2