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Ubuntu Security Notice USN-3586-2

Ubuntu Security Notice USN-3586-2
Posted May 28, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3586-2 - USN-3586-1 fixed a vulnerability in DHCP. This update provides the corresponding update for Ubuntu 12.04 ESM. Felix Wilhelm discovered that the DHCP client incorrectly handled certain malformed responses. A remote attacker could use this issue to cause the DHCP client to crash, resulting in a denial of service, or possibly execute arbitrary code. In the default installation, attackers would be isolated by the dhclient AppArmor profile. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2018-5732, CVE-2018-5733
SHA-256 | 87bf0b43aecf798e53a7ec0e8497cf38db7e719785f0c2616c8cddec7692bcc1

Ubuntu Security Notice USN-3586-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3586-2
May 28, 2018

isc-dhcp vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in DHCP.

Software Description:
- isc-dhcp: DHCP server and client

Details:

USN-3586-1 fixed a vulnerability in DHCP. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

Felix Wilhelm discovered that the DHCP client incorrectly handled
certain malformed responses. A remote attacker could use this issue to
cause the DHCP client to crash, resulting in a denial of service, or
possibly execute arbitrary code. In the default installation,
attackers would be isolated by the dhclient AppArmor profile.
(CVE-2018-5732)

Felix Wilhelm discovered that the DHCP server incorrectly handled
reference counting. A remote attacker could possibly use this issue to
cause the DHCP server to crash, resulting in a denial of service.
(CVE-2018-5733)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
isc-dhcp-client 4.1.ESV-R4-0ubuntu5.13
isc-dhcp-relay 4.1.ESV-R4-0ubuntu5.13
isc-dhcp-server 4.1.ESV-R4-0ubuntu5.13
isc-dhcp-server-ldap 4.1.ESV-R4-0ubuntu5.13

In general, a standard system update will make all the necessary
changes.

References:
https://usn.ubuntu.com/usn/usn-3586-2
https://usn.ubuntu.com/usn/usn-3586-1
CVE-2018-5732, CVE-2018-5733
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