Authentication Bypass in Brother (CVE-2017-7588, CVSS 9.8)

Summary

Authentication bypass in Brother (CVE-2017-7588). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

On certain Brother devices, authorization is mishandled by including a valid AuthCookie cookie in the HTTP response to a failed login attempt. Affected models are: MFC-J6973CDW MFC-J4420DW MFC-8710DW MFC-J4620DW MFC-L8850CDW MFC-J3720 MFC-J6520DW MFC-L2740DW MFC-J5910DW MFC-J6920DW MFC-L2700DW MFC-9130CW MFC-9330CDW MFC-9340CDW MFC-J5620DW MFC-J6720DW MFC-L8600CDW MFC-L9550CDW MFC-L2720DW DCP-L2540DW DCP-L2520DW HL-3140CW HL-3170CDW HL-3180CDW HL-L8350CDW HL-L2380DW ADS-2500W ADS-1000W ADS-1500W.

Source: NIST National Vulnerability Database NVD

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-2017-7588 has been found in Brother.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Brother CVE-2017-7588" on the vendor's site.

CVE-2017-7588 (Brother) — CWE-287 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
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

Authentication bypass (CWE-287) exists in Brother.

📍 Affected scope

Check the vendor advisory for the affected versions of Brother.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ 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 'Brother' . 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 'Brother' . | 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 Brother を grep し、稼働しているサービス・バージョンを把握する。
2
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

web cxsecurity.com
web exploit-db.com