Vulnerability in pfSense (CVE-2017-1000479)

Summary

Vulnerability in pfSense (CVE-2017-1000479). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 2.4.2-RELEASE or later.

Original description

The description as published by the source.

pfSense versions 2.4.1 and lower are vulnerable to clickjacking attacks in the CSRF error page resulting in privileged execution of arbitrary code, because the error detection occurs before an X-Frame-Options header is set. This is fixed in 2.4.2-RELEASE. OPNsense, a 2015 fork of pfSense, was not vulnerable since version 16.1.16 released on June 06, 2016. The unprotected web form was removed from the code during an internal security audit under "possibly insecure" suspicions.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

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 CVE-2017-1000479 has been found in pfSense.
Successful exploitation can lead to full system takeover.
What to do: upgrade pfSense to 2.4.2-RELEASE or later.
If unsure, ask your IT team or search "pfSense CVE-2017-1000479" on the vendor's site.

CVE-2017-1000479 (pfSense)
Attack vector: remote (network-reachable) / unauthenticated
Patched: 2.4.2-RELEASE — 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 pfSense.

📍 Affected scope

Check the vendor advisory for the affected versions of pfSense.

🔥 Severity

Severity: ?. Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 2.4.2-RELEASE.

🛡️ 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 'pfSense' . 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 exposure identify
```
grep -r 'pfSense' . | 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 pfSense 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 patch patch
```
Upgrade pfSense to 2.4.2-RELEASE
```
ステージング環境で 2.4.2-RELEASE 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 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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

References

advisory netgate.com
patch github.com
patch github.com
report doc.pfsense.org
report openwall.com
report securify.nl