[SECURITY-L] [SECURITY] [DSA 5251-1] isc-dhcp security update

[CSIRT Unicamp]

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Debian Security Advisory DSA-5251-1                   security em debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
October 06, 2022                      https://www.debian.org/security/faq
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Package        : isc-dhcp
CVE ID         : CVE-2022-2928 CVE-2022-2929
Debian Bug     : 1021320

Several vulnerabilities have been discovered in the ISC DHCP client,
relay and server.

CVE-2022-2928
https://kb.isc.org/docs/cve-2022-2928

    It was discovered that the DHCP server does not correctly perform
    option reference counting when configured with "allow leasequery;".
    A remote attacker can take advantage of this flaw to cause a denial
    of service (daemon crash).

CVE-2022-2929
https://kb.isc.org/docs/cve-2022-2929

    It was discovered that the DHCP server is prone to a memory leak
    flaw when handling contents of option 81 (fqdn) data received in
    a DHCP packet. A remote attacker can take advantage of this flaw
    to cause DHCP servers to consume resources, resulting in denial
    of service.

For the stable distribution (bullseye), these problems have been fixed in
version 4.4.1-2.3+deb11u1.

We recommend that you upgrade your isc-dhcp packages.

For the detailed security status of isc-dhcp please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/isc-dhcp

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce em lists.debian.org
===
Computer Security Incident Response Team - CSIRT
Universidade Estadual de Campinas - Unicamp
Centro de Computacao - CCUEC
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Contato: +55 19 3521-2289 ou INOC-DBA: 1251*830
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