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Debian Security Advisory DSA-4133-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
March 07, 2018                        https://www.debian.org/security/faq
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Package        : isc-dhcp
CVE ID         : CVE-2017-3144 CVE-2018-5732 CVE-2018-5733
Debian Bug     : 887413 891785 891786

Several vulnerabilities have been discovered in the ISC DHCP client,
relay and server. The Common Vulnerabilities and Exposures project
identifies the following issues:

CVE-2017-3144

    It was discovered that the DHCP server does not properly clean up
    closed OMAPI connections, which can lead to exhaustion of the pool
    of socket descriptors available to the DHCP server, resulting in
    denial of service.

CVE-2018-5732

    Felix Wilhelm of the Google Security Team discovered that the DHCP
    client is prone to an out-of-bound memory access vulnerability when
    processing specially constructed DHCP options responses, resulting
    in potential execution of arbitrary code by a malicious DHCP server.

CVE-2018-5733

    Felix Wilhelm of the Google Security Team discovered that the DHCP
    server does not properly handle reference counting when processing
    client requests. A malicious client can take advantage of this flaw
    to cause a denial of service (dhcpd crash) by sending large amounts
    of traffic.

For the oldstable distribution (jessie), these problems have been fixed
in version 4.3.1-6+deb8u3.

For the stable distribution (stretch), these problems have been fixed in
version 4.3.5-3+deb9u1.

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@lists.debian.org
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