CVE-2018-5743

NameCVE-2018-5743
DescriptionBy design, BIND is intended to limit the number of TCP clients that can be connected at any given time. The number of allowed connections is a tunable parameter which, if unset, defaults to a conservative value for most servers. Unfortunately, the code which was intended to limit the number of simultaneous connections contained an error which could be exploited to grow the number of simultaneous connections beyond this limit. Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.6, 9.12.0 -> 9.12.4, 9.14.0. BIND 9 Supported Preview Edition versions 9.9.3-S1 -> 9.11.5-S3, and 9.11.5-S5. Versions 9.13.0 -> 9.13.7 of the 9.13 development branch are also affected. Versions prior to BIND 9.9.0 have not been evaluated for vulnerability to CVE-2018-5743.
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-1859-1, DSA-4440-1
NVD severitymedium
Debian Bugs927932

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
bind9 (PTS)jessie1:9.9.5.dfsg-9+deb8u15vulnerable
jessie (security)1:9.9.5.dfsg-9+deb8u18fixed
stretch (security), stretch1:9.10.3.dfsg.P4-12.3+deb9u5fixed
bullseye, sid, buster1:9.11.5.P4+dfsg-5.1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
bind9source(unstable)1:9.11.5.P4+dfsg-4927932
bind9sourcejessie1:9.9.5.dfsg-9+deb8u18DLA-1859-1
bind9sourcestretch1:9.10.3.dfsg.P4-12.3+deb9u5DSA-4440-1

Notes

https://kb.isc.org/docs/cve-2018-5743
https://gitlab.isc.org/isc-projects/bind9/commit/9689ffc485df8f971f0ad81ab8ab1f5389493776
https://gitlab.isc.org/isc-projects/bind9/commit/55a7a458e30e47874d34bdf1079eb863a0512396
https://gitlab.isc.org/isc-projects/bind9/commit/9446629b730c59c4215f08d37fbaf810282fbccb
https://gitlab.isc.org/isc-projects/bind9/commit/87d431161450777ea093821212abfb52d51b36e3
https://gitlab.isc.org/isc-projects/bind9/commit/13f7c918b8720d890408f678bd73c20e634539d9
https://gitlab.isc.org/isc-projects/bind9/commit/d01023aaac35543daffbdf48464e320150235d41
Additionally: https://lists.isc.org/pipermail/bind-users/2019-April/101673.html
https://gitlab.isc.org/isc-projects/bind9/merge_requests/1864.patch

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