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CVE-2009-0238 CISA KEV high

[KEV] Code Injection in Microsoft office (CVE-2009-0238)

Summary

code injection in Microsoft office (CVE-2009-0238). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.

AI summary openai / gpt-4o

There's a vulnerability in Microsoft Office Excel that allows remote code execution. If a user opens a specially crafted Excel file, an attacker could take full control of the system. This could lead to severe issues such as data breaches and system downtime. It's crucial for companies to inform employees not to open Excel files from untrusted sources.
A remote code execution vulnerability in Microsoft Office Excel (CWE-94) allows complete system takeover if a user opens a crafted Excel file. Exploitation requires user interaction (opening the file) and does not require authentication. The specific affected and patched versions are not provided. This vulnerability is listed on the CISA KEV list, indicating its severity.
❓ What is the problem
Remote code execution vulnerability in Microsoft Office Excel.
📍 Affected scope
When a specially crafted Excel file is opened by a user.
🔥 Severity
High (CWE-94)
🔧 How to fix
No specific patch versions are mentioned yet.
🛡️ Workaround
Educate users not to open untrusted Excel files.
🔍 Detection
Monitor for unexpected opening of Excel files from untrusted sources.

Related past incidents Similar incidents extracted from past CVEs

Similar RCE vulnerability in Microsoft Office Excel allowing code execution via crafted files.
A vulnerability in Microsoft Office Excel allowing remote code execution via specific file content.
Excel vulnerability allowing attackers to execute arbitrary code via crafted document.

If this happens at your company Expected impact per business scenario

📌 企業での一般的なオフィス環境
知らない相手からのExcelファイルを開けた際に、システムが攻撃を受け、業務が停止する可能性がある。
📌 ECサイト運営企業の場合
攻撃者によるシステム制御により、顧客データが流出し、信頼性が損なわれる可能性がある。
📌 製造業社内システムの場合
生産ラインの停止や業務情報の漏洩が発生する可能性がある。
Recommended action
信頼できない送信元からのExcelファイルを開かないよう従業員を教育し、プロアクティブなセキュリティ対策を講じる。

Response Actions (7 steps)

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify
    grep -r 'office' . | 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 `office` を grep し、稼働しているサービス・バージョンを把握する。

  2. 4
    Consider incident declaration escalate
    Notify SOC / on-call

    CISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。

  3. 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。

References

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