CVE-2020-8617

NameCVE-2020-8617
DescriptionUsing a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.
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-2227-1, DSA-4689-1
NVD severitymedium
Debian Bugs961939

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+deb8u19fixed
stretch1:9.10.3.dfsg.P4-12.3+deb9u5vulnerable
stretch (security)1:9.10.3.dfsg.P4-12.3+deb9u6fixed
buster1:9.11.5.P4+dfsg-5.1vulnerable
buster (security)1:9.11.5.P4+dfsg-5.1+deb10u1fixed
bullseye, sid1:9.16.3-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
bind9source(unstable)1:9.16.3-1961939
bind9sourcebuster1:9.11.5.P4+dfsg-5.1+deb10u1DSA-4689-1
bind9sourcejessie1:9.9.5.dfsg-9+deb8u19DLA-2227-1
bind9sourcestretch1:9.10.3.dfsg.P4-12.3+deb9u6DSA-4689-1

Notes

https://kb.isc.org/docs/cve-2020-8617
https://kb.isc.org/docs/cve-2020-8617-faq-and-supplemental-information

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