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Debian LTS Advisory DLA-3146-1              debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Utkarsh Gupta
October 11, 2022                            https://wiki.debian.org/LTS
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Package        : isc-dhcp
Version        : 4.4.1-2+deb10u2
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

    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

    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 Debian 10 buster, these problems have been fixed in version
4.4.1-2+deb10u2.

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/source-package/isc-dhcp

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