Vulnerability in log4net
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-2018-1285 has been found in log4net.
Successful exploitation can lead to full system takeover.
What to do: upgrade log4net to 1.2.10+dfsg-8 or later.
If unsure, ask your IT team or search "log4net DEBIAN-CVE-2018-1285" on the vendor's site.
DEBIAN-CVE-2018-1285 (log4net)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.2.10+dfsg-8 — 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 log4net.
Check the vendor advisory for the affected versions of log4net.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 1.2.10+dfsg-8.
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 'log4net' . 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 'log4net' . | 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
log4net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 log4net to 1.2.10+dfsg-8ステージング環境で 1.2.10+dfsg-8 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:13 | log4net |
< 1.2.10+dfsg-8 |
1.2.10+dfsg-8 |
| Debian:14 | log4net |
< 1.2.10+dfsg-8 |
1.2.10+dfsg-8 |
Original description The description as published by the source.
Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files.
Source: OSV.dev (Open Source Vulnerabilities) OSV
References
- advisory security-tracker.debian.org