Ubuntu Security Notice 1519-1 - Markus Hietava discovered that the DHCP server incorrectly handled certain malformed client identifiers. A remote attacker could use this issue to cause DHCP to crash, resulting in a denial of service. Glen Eustace discovered that the DHCP server incorrectly handled memory. A remote attacker could use this issue to cause DHCP to crash, resulting in a denial of service.
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Ubuntu Security Notice USN-1519-1
July 26, 2012
isc-dhcp vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
Summary:
DHCP could be made to crash if it received specially crafted network
traffic.
Software Description:
- isc-dhcp: DHCP server and client
Details:
Markus Hietava discovered that the DHCP server incorrectly handled certain
malformed client identifiers. A remote attacker could use this issue to
cause DHCP to crash, resulting in a denial of service. (CVE-2012-3571)
Glen Eustace discovered that the DHCP server incorrectly handled memory. A
remote attacker could use this issue to cause DHCP to crash, resulting in a
denial of service. (CVE-2012-3954)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 LTS:
isc-dhcp-server 4.1.ESV-R4-0ubuntu5.2
Ubuntu 11.10:
isc-dhcp-server 4.1.1-P1-17ubuntu10.3
Ubuntu 11.04:
isc-dhcp-server 4.1.1-P1-15ubuntu9.4
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1519-1
CVE-2012-3571, CVE-2012-3954
Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.ESV-R4-0ubuntu5.2
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-17ubuntu10.3
https://launchpad.net/ubuntu/+source/isc-dhcp/4.1.1-P1-15ubuntu9.4