| Name | CVE-2019-6477 |
| Description | With 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). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 945171 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| bind9 (PTS) | jessie, jessie (lts) | 1:9.9.5.dfsg-9+deb8u31 | fixed |
| stretch (security) | 1:9.10.3.dfsg.P4-12.3+deb9u12 | fixed |
| stretch (lts), stretch | 1:9.10.3.dfsg.P4-12.3+deb9u16 | fixed |
| buster, buster (lts) | 1:9.11.5.P4+dfsg-5.1+deb10u13 | fixed |
| buster (security) | 1:9.11.5.P4+dfsg-5.1+deb10u11 | fixed |
| bullseye | 1:9.16.50-1~deb11u2 | fixed |
| bullseye (security) | 1:9.16.50-1~deb11u1 | fixed |
| bookworm (security), bookworm | 1:9.18.28-1~deb12u2 | fixed |
| sid, trixie | 1:9.20.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| bind9 | source | wheezy | (not affected) | | | |
| bind9 | source | jessie | (not affected) | | | |
| bind9 | source | stretch | (not affected) | | | |
| bind9 | source | buster | 1:9.11.5.P4+dfsg-5.1+deb10u1 | | | |
| bind9 | source | (unstable) | 1:9.11.14+dfsg-1 | | | 945171 |
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
[wheezy] - bind9 <not-affected> (Vulnerable code introduced later)