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)
NVD severitymedium
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+deb8u19fixed
stretch1:9.10.3.dfsg.P4-12.3+deb9u5fixed
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)1:9.11.14+dfsg-1945171
bind9sourcebuster1:9.11.5.P4+dfsg-5.1+deb10u1
bind9sourcejessie(not affected)
bind9sourcestretch(not affected)

Notes

[stretch] - bind9 <not-affected> (Vulnerable code not present, no TCP pipelining support)
[jessie] - bind9 <not-affected> (Vulnerable code not present)
https://kb.isc.org/docs/cve-2019-6477

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