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ubuntuUbuntuUSN-803-2
HistoryJan 27, 2010 - 12:00 a.m.

Dhcp vulnerability

2010-01-2700:00:00
ubuntu.com
60

7.9 High

AI Score

Confidence

High

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.076 Low

EPSS

Percentile

94.0%

Releases

  • Ubuntu 9.10
  • Ubuntu 9.04
  • Ubuntu 8.10

Packages

  • dhcp3 -

Details

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.

Original advisory details:

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.

Rows per page:
1-10 of 231

7.9 High

AI Score

Confidence

High

10 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.076 Low

EPSS

Percentile

94.0%