1. Ubuntu Security Notices
  2. USN-5658-1

USN-5658-1: DHCP vulnerabilities

Publication date

5 October 2022

Overview

Several security issues were fixed in DHCP.

Releases

Packages

Details

It was discovered that DHCP incorrectly handled option reference counting.
A remote attacker could possibly use this issue to cause DHCP servers to
crash, resulting in a denial of service. (CVE-2022-2928)

It was discovered that DHCP incorrectly handled certain memory operations.
A remote attacker could possibly use this issue to cause DHCP clients and
servers to consume resources, leading to a denial of service.
(CVE-2022-2929)

It was discovered that DHCP incorrectly handled option reference counting.
A remote attacker could possibly use this issue to cause DHCP servers to
crash, resulting in a denial of service. (CVE-2022-2928)

It was discovered that DHCP incorrectly handled certain memory operations.
A remote attacker could possibly use this issue to cause DHCP clients and
servers to consume resources, leading to a denial of service.
(CVE-2022-2929)

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
22.04 jammy isc-dhcp-client –  4.4.1-2.3ubuntu2.3
isc-dhcp-server –  4.4.1-2.3ubuntu2.3
20.04 focal isc-dhcp-client –  4.4.1-2.1ubuntu5.20.04.4
isc-dhcp-server –  4.4.1-2.1ubuntu5.20.04.4
18.04 bionic isc-dhcp-client –  4.3.5-3ubuntu7.4
isc-dhcp-server –  4.3.5-3ubuntu7.4

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References

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