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Sicherheit: Denial of Service in DHCP
Aktuelle Meldungen Distributionen
Name: Denial of Service in DHCP
ID: USN-4969-1
Distribution: Ubuntu
Plattformen: Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 20.10, Ubuntu 21.04
Datum: Do, 27. Mai 2021, 22:54
Referenzen: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25217
Applikationen: ISC DHCP

Originalnachricht

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From: Marc Deslauriers <marc.deslauriers@canonical.com>
Reply-To: Ubuntu Security <security@ubuntu.com>
To: "ubuntu-security-announce@lists.ubuntu.com"
<ubuntu-security-announce@lists.ubuntu.com>
Message-ID: <b7d570ab-7550-108b-47b3-4e40ee2f7133@canonical.com>
Subject: [USN-4969-1] DHCP vulnerability

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==========================================================================
Ubuntu Security Notice USN-4969-1
May 27, 2021

isc-dhcp vulnerability
==========================================================================

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

DHCP could be made to crash if it received specially crafted network
traffic.

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

Details:

Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly
handled lease file parsing. A remote attacker could possibly use this issue
to cause DHCP to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 21.04:
isc-dhcp-client 4.4.1-2.2ubuntu6.1
isc-dhcp-server 4.4.1-2.2ubuntu6.1

Ubuntu 20.10:
isc-dhcp-client 4.4.1-2.1ubuntu10.1
isc-dhcp-server 4.4.1-2.1ubuntu10.1

Ubuntu 20.04 LTS:
isc-dhcp-client 4.4.1-2.1ubuntu5.20.04.2
isc-dhcp-server 4.4.1-2.1ubuntu5.20.04.2

Ubuntu 18.04 LTS:
isc-dhcp-client 4.3.5-3ubuntu7.3
isc-dhcp-server 4.3.5-3ubuntu7.3

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

References:
https://ubuntu.com/security/notices/USN-4969-1
CVE-2021-25217

Package Information:
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.2ubuntu6.1
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.1ubuntu10.1
https://launchpad.net/ubuntu/+source/isc-dhcp/4.4.1-2.1ubuntu5.20.04.2
https://launchpad.net/ubuntu/+source/isc-dhcp/4.3.5-3ubuntu7.3


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