CVE-2018-5733

NameCVE-2018-5733
DescriptionA malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1313-1, DSA-4133-1
NVD severitymedium
Debian Bugs891785

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
isc-dhcp (PTS)stretch4.3.5-3+deb9u1fixed
stretch (security)4.3.5-3+deb9u2fixed
buster4.4.1-2+deb10u1fixed
bullseye, sid4.4.1-2.3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
isc-dhcpsourcewheezy4.2.2.dfsg.1-5+deb70u9DLA-1313-1
isc-dhcpsourcejessie4.3.1-6+deb8u3DSA-4133-1
isc-dhcpsourcestretch4.3.5-3+deb9u1DSA-4133-1
isc-dhcpsource(unstable)4.3.5-3.1891785

Notes

https://kb.isc.org/article/AA-01567/75/CVE-2018-5733
https://bugs.isc.org/Public/Bug/Display.html?id=47140
https://gitlab.isc.org/isc-projects/dhcp/-/commit/197b26f25309f947b97a83b8fdfc414b767798f8 (4.4.1)
Fixes for 4.3.6p1: https://gitlab.isc.org/isc-projects/dhcp/-/commit/99a25aedea02d9c259cb8fabf4be700fb32571a3

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