DHCP vulnerability

2012-09-1800:00:00

ubuntu.com

6.4 Medium

AI Score

Confidence

Low

7.1 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:N/A:C

0.021 Low

EPSS

Percentile

88.9%

JSON

Releases

Ubuntu 12.04
Ubuntu 11.10
Ubuntu 11.04
Ubuntu 10.04

Packages

dhcp3 - DHCP server and client
isc-dhcp - DHCP server and client

Details

Glen Eustace discovered that the DHCP server incorrectly handled IPv6
expiration times. A remote attacker could use this issue to cause DHCP to
crash, resulting in a denial of service. This issue only affected Ubuntu
11.04, Ubuntu 11.10 and Ubuntu 12.04 LTS. (CVE-2012-3955)

Dan Rosenberg discovered that the DHCP AppArmor profile could be escaped by
using environment variables. This update mitigates the issue by sanitizing
certain variables in the DHCP shell scripts.

OSVersionArchitecturePackageVersionFilename
Ubuntu12.04noarchisc-dhcp-server< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-client< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-client-dbg< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-client-udeb< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-common< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-dev< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-relay< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-relay-dbg< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-server-dbg< 4.1.ESV-R4-0ubuntu5.5UNKNOWN
Ubuntu12.04noarchisc-dhcp-server-ldap< 4.1.ESV-R4-0ubuntu5.5UNKNOWN

OS	Version	Architecture	Package	Version	Filename
Ubuntu	12.04	noarch	isc-dhcp-server	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-client	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-client-dbg	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-client-udeb	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-common	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-dev	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-relay	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-relay-dbg	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-server-dbg	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN
Ubuntu	12.04	noarch	isc-dhcp-server-ldap	< 4.1.ESV-R4-0ubuntu5.5	UNKNOWN