| Name | CVE-2023-2911 |
| Description | If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow. This issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5439-1 |
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+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 | jessie | (not affected) | |||
| bind9 | source | stretch | (not affected) | |||
| bind9 | source | buster | (not affected) | |||
| bind9 | source | bullseye | 1:9.16.42-1~deb11u1 | DSA-5439-1 | ||
| bind9 | source | bookworm | 1:9.18.16-1~deb12u1 | DSA-5439-1 | ||
| bind9 | source | (unstable) | 1:9.18.16-1 |
[buster] - bind9 <not-affected> (Vulnerable code not present; libns added in 9.19.14)
https://kb.isc.org/docs/cve-2023-2911
https://downloads.isc.org/isc/bind9/9.18.16/patches/0003-CVE-2023-2911.patch
https://downloads.isc.org/isc/bind9/9.16.42/patches/0003-CVE-2023-2911.patch
[stretch] - bind9 <not-affected> (Vulnerable code introduced later)
[jessie] - bind9 <not-affected> (Vulnerable code introduced later)