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CVE-2012-1854
CISA KEV
high
[KEV] Vulnerability in Microsoft visual-basic-for-applications-vba (CVE-2012-1854)
Summary
vulnerability in Microsoft visual-basic-for-applications-vba (CVE-2012-1854). Risk of unauthorized operations or information disclosure. Listed in CISA KEV — actively exploited.
AI summary openai / gpt-4o
This vulnerability found in Microsoft Visual Basic for Applications (VBA) could allow malicious code to be executed from outside. It resembles past issues related to DLL loading, and if successful, could result in information leakage or system outages. To mitigate the impact, it is crucial to apply security patches promptly and review system settings.
Microsoft Visual Basic for Applications (VBA) has a vulnerability that can lead to remote code execution due to insecure library loading, classified as CWE-426. The system can be affected by loading arbitrary libraries. The potential attack vector includes tricking users into running a malicious VBA file. Before applying patches, it is recommended to implement workarounds such as restricting library loading.
❓ What is the problem
A vulnerability allowing remote code execution through insecure library loading in VBA.
📍 Affected scope
Affects Microsoft Visual Basic for Applications (VBA).
🔥 Severity
High severity with potential for remote exploitation without authentication.
🔧 How to fix
Apply the official patches from Microsoft for the affected environment.
🛡️ Workaround
Restrict library loading paths and enforce strict validation before library execution.
🔍 Detection
Monitor system for unusual library loading behavior or execution of unverified VBA scripts.
Related past incidents Similar incidents extracted from past CVEs
A similar DLL loading issue in Windows that allowed attackers to execute arbitrary code.
Another Microsoft RCE vulnerability through VBA, leading to similar exploit paths.
Recent DLL loading issue in Microsoft products with a similar impact.
If this happens at your company Expected impact per business scenario
📌 ECサイトのシステムで
攻撃者によりリモートでコードが実行され、顧客情報が漏洩する可能性があります。
📌 社内システムで
業務システムが停止し、日常業務に支障をきたす可能性があります。
📌 企業のクラウドサービスで
インフラ全体に影響が及び、サービス提供が困難になる可能性があります。
Recommended action
企業は直ちに公式パッチを適用し、ライブラリロードの制限などのセキュリティ対策を講じることを推奨します。
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'visual-basic-for-applications-vba' . | 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 `visual-basic-for-applications-vba` を grep し、稼働しているサービス・バージョンを把握する。
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4Consider incident declaration escalate
Notify SOC / on-callCISA 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。
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7Post-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
- advisory NVD