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 (attack range: remote)
Debian Bugs891785

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
isc-dhcp (PTS)jessie (security), jessie4.3.1-6+deb8u3fixed
stretch (security), stretch4.3.5-3+deb9u1fixed
buster, sid4.4.1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs

Notes;a=commit;h=197b26f25309f947b97a83b8fdfc414b767798f8 (4.4.1)
Fixes for 4.3.6p1:;a=commit;h=99a25aedea02d9c259cb8fabf4be700fb32571a3

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