Vulnerability in isc-dhcp
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as DEBIAN-CVE-2018-5732 has been found in isc-dhcp.
Risk of unauthorized operations or information disclosure.
What to do: upgrade isc-dhcp to 4.3.5-3.1 or later.
If unsure, ask your IT team or search "isc-dhcp DEBIAN-CVE-2018-5732" on the vendor's site.
DEBIAN-CVE-2018-5732 (isc-dhcp)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 4.3.5-3.1 — 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.
A vulnerability (unclassified) exists in isc-dhcp.
Check the vendor advisory for the affected versions of isc-dhcp.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 4.3.5-3.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'isc-dhcp' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1
Identify exposureidentify
grep -r 'isc-dhcp' . | 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
isc-dhcpを grep し、稼働しているサービス・バージョンを把握する。 -
2
Apply patchpatch
Upgrade isc-dhcp to 4.3.5-3.1ステージング環境で 4.3.5-3.1 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を含めること。
-
3
Post-deployment verificationverify
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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| Debian:12 | isc-dhcp |
< 4.3.5-3.1 |
4.3.5-3.1 |
| Debian:13 | isc-dhcp |
< 4.3.5-3.1 |
4.3.5-3.1 |
Original description The description as published by the source.
Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org