Vulnerability in symfony (DEBIAN-CVE-2023-46733)

Summary

vulnerability in symfony (DEBIAN-CVE-2023-46733). Data can be tampered with by attackers. Exploitable via ``SessionStrategyListener``. Mitigation: upgrade to `5.4.23+dfsg-1+deb12u1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **DEBIAN-CVE-2023-46733** has been found in symfony. Attackers can target a specific entry point like ``SessionStrategyListener`` over the network to misuse the product. Data can be tampered with by attackers. CVSS score: ?/10. What to do: upgrade symfony to **5.4.23+dfsg-1+deb12u1** or later. If unsure, ask your IT team or search "symfony DEBIAN-CVE-2023-46733" on the vendor's site.

DEBIAN-CVE-2023-46733 (symfony) — Attack vector: remote (network-reachable) / no user interaction Attack surface: `SessionStrategyListener` Patched: `5.4.23+dfsg-1+deb12u1` — 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 symfony. Attackers reach the vulnerable code path via ``SessionStrategyListener`` without authentication.

📍 Affected scope

symfony — . Attack surface: `SessionStrategyListener`.

🔥 Severity

Severity: ?. Data can be tampered with by attackers

🔧 How to fix

Update to **5.4.23+dfsg-1+deb12u1**.

🛡️ 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 'symfony' .` 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

1
Identify exposure identify
```
grep -r 'symfony' . | 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 `symfony` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade symfony to 5.4.23+dfsg-1+deb12u1
```
ステージング環境で 5.4.23+dfsg-1+deb12u1 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。
7
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 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

Debian:12 symfony

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.23+dfsg-1+deb12u1"}]}]

Debian:13 symfony

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.31+dfsg-1"}]}]

Debian:14 symfony