CVE-2019-6477

NameCVE-2019-6477
DescriptionWith pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem).
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)
Debian Bugs945171

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
bind9 (PTS)jessie1:9.9.5.dfsg-9+deb8u15fixed
jessie (security)1:9.9.5.dfsg-9+deb8u18fixed
stretch (security), stretch1:9.10.3.dfsg.P4-12.3+deb9u5vulnerable
bullseye, sid, buster1:9.11.5.P4+dfsg-5.1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
bind9source(unstable)(unfixed)945171
bind9sourcejessie(not affected)

Notes

[buster] - bind9 <no-dsa> (Minor issue; can be fixed via point release)
[stretch] - bind9 <no-dsa> (Minor issue; can be fixed via point release)
[jessie] - bind9 <not-affected> (Vulnerable code not present)
https://kb.isc.org/docs/cve-2019-6477

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