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UBUNTU-CVE-2023-50868
Vulnerability in bind9 (UBUNTU-CVE-2023-50868)
Summary
vulnerability in bind9 (UBUNTU-CVE-2023-50868). Data can be tampered with by attackers. Mitigation: upgrade to `1:9.9.5.dfsg-3ubuntu0.19+esm12` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2023-50868** has been found in bind9.
Data can be tampered with by attackers. CVSS score: ?/10.
What to do: upgrade bind9 to **1:9.9.5.dfsg-3ubuntu0.19+esm12** or later.
If unsure, ask your IT team or search "bind9 UBUNTU-CVE-2023-50868" on the vendor's site.
UBUNTU-CVE-2023-50868 (bind9) —
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `1:9.9.5.dfsg-3ubuntu0.19+esm12` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (unclassified) exists in bind9.
📍 Affected scope
bind9 — .
🔥 Severity
Severity: ?. Data can be tampered with by attackers
🔧 How to fix
Update to **1:9.9.5.dfsg-3ubuntu0.19+esm12**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'bind9' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'bind9' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `bind9` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade bind9 to 1:9.9.5.dfsg-3ubuntu0.19+esm12ステージング環境で 1:9.9.5.dfsg-3ubuntu0.19+esm12 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Ubuntu:Pro:14.04:LTS
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.9.5.dfsg-3ubuntu0.19+esm12"}]}]
Ubuntu:Pro:14.04:LTS
dnsmasq
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:14.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.10.3.dfsg.P4-8ubuntu1.19+esm8"}]}]
Ubuntu:Pro:16.04:LTS
dnsmasq
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.16.04.1+esm1"}]}]
Ubuntu:Pro:16.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
knot-resolver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
pdns-recursor
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.11.3+dfsg-1ubuntu1.19+esm3"}]}]
Ubuntu:Pro:18.04:LTS
dnsmasq
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.18.04.1+esm1"}]}]
Ubuntu:Pro:18.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
knot-resolver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
pdns-recursor
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.16.48-0ubuntu0.20.04.1"}]}]
Ubuntu:20.04:LTS
dnsmasq
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.20.04.1"}]}]
Ubuntu:20.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.5"}]}]
Ubuntu:20.04:LTS
bind9-libs
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:20.04:LTS
knot-resolver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
pdns-recursor
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
bind9
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.18-0ubuntu0.22.04.2"}]}]
Ubuntu:22.04:LTS
bind9-libs
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
dnsmasq
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-1ubuntu5.4"}]}]
Ubuntu:Pro:22.04:LTS
knot-resolver
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
pdns-recursor
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
isc-dhcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
unbound
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.1-1ubuntu1"}]}]
Ubuntu:25.10
isc-dhcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04
isc-dhcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
isc-dhcp
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory https://ubuntu.com/security/notices/USN-6633-1
- advisory https://ubuntu.com/security/notices/USN-6642-1
- advisory https://ubuntu.com/security/notices/USN-6657-1
- advisory https://ubuntu.com/security/notices/USN-6665-1
- advisory https://ubuntu.com/security/notices/USN-6723-1
- advisory https://ubuntu.com/security/notices/USN-6657-2
- report https://ubuntu.com/security/CVE-2023-50868
- report https://kb.isc.org/docs/cve-2023-50868
- report https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
- report https://www.knot-resolver.cz/2024-02-13-knot-resolver-5.7.1.html
- report https://blog.powerdns.com/2024/02/13/powerdns-recursor-4-8-6-4-9-3-5-0-2-released
- report https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
- report https://nlnetlabs.nl/downloads/unbound/CVE-2023-50387_CVE-2023-50868.txt
- report https://www.cve.org/CVERecord?id=CVE-2023-50868