| Name | CVE-2021-25219 |
| Description | In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2807-1, DSA-4994-1, ELA-509-1 |
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+deb9u17 | 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 | |
| trixie | 1:9.20.4-2 | fixed | |
| sid | 1:9.20.4-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| bind9 | source | jessie | 1:9.9.5.dfsg-9+deb8u23 | ELA-509-1 | ||
| bind9 | source | stretch | 1:9.10.3.dfsg.P4-12.3+deb9u10 | DLA-2807-1 | ||
| bind9 | source | buster | 1:9.11.5.P4+dfsg-5.1+deb10u6 | DSA-4994-1 | ||
| bind9 | source | bullseye | 1:9.16.22-1~deb11u1 | DSA-4994-1 | ||
| bind9 | source | (unstable) | 1:9.17.19-1 |
https://kb.isc.org/docs/cve-2021-25219
https://gitlab.isc.org/isc-projects/bind9/commit/8fe18c0566c41228a568157287f5a44f96d37662 (v9_16_22)
https://gitlab.isc.org/isc-projects/bind9/commit/e4931584a34bdd0a0d18e4d918fb853bf5296787 (v9_16_22)