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Vulnerabilities

CVE-2017-9805

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Apache Struts Deserialization of Untrusted Data Vulnerability — Apache Struts REST Plugin uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can l
Published: Nov 3, 2021  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Apache Struts Deserialization of Untrusted Data Vulnerability — Apache Struts REST Plugin uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to remote code execution when deserializing XML payloads.

🤖 AI Executive Summary

CVE-2017-9805 is a critical remote code execution vulnerability in the Apache Struts REST plugin caused by unsafe deserialization of XML payloads using XStream without type filtering. This vulnerability has a CVSS score of 9.0 and active exploits are publicly available, making it extremely dangerous for any organization running affected versions of Apache Struts. The vulnerability was famously exploited in the wild and was associated with major breaches including the Equifax data breach. Immediate patching is essential as exploitation requires no authentication and can lead to full system compromise.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 9, 2026 06:48
🇸🇦 Saudi Arabia Impact Assessment
هذه الثغرة تشكل خطراً كبيراً على المؤسسات السعودية التي تستخدم تطبيقات ويب مبنية على Apache Struts. القطاعات الأكثر تعرضاً تشمل: القطاع المصرفي (البنوك الخاضعة لرقابة ساما) التي تستخدم بوابات إلكترونية مبنية على Java/Struts، والجهات الحكومية التي تدير بوابات الخدمات الإلكترونية (مثل أبشر ومنصات الحكومة الإلكترونية)، وقطاع الطاقة (أرامكو وسابك) الذي يستخدم تطبيقات ويب داخلية، وقطاع الاتصالات (STC وموبايلي وزين). نظراً لانتشار تطبيقات Java في البنية التحتية السعودية وتوفر أدوات استغلال جاهزة، فإن الخطر مرتفع جداً.
🏢 Affected Saudi Sectors
Banking Government Energy Telecommunications Healthcare Retail Education
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Apache Struts installations across your environment, particularly those using the REST plugin (struts2-rest-plugin)
2. Upgrade Apache Struts to version 2.5.13 or later immediately
3. If immediate patching is not possible, remove or disable the Struts REST plugin if not required

COMPENSATING CONTROLS:
1. Implement Web Application Firewall (WAF) rules to block malicious XML deserialization payloads targeting Struts REST endpoints
2. Block Content-Type headers containing 'application/xml' at the WAF level for Struts REST endpoints if XML is not required
3. Restrict network access to Struts-based applications using network segmentation
4. Monitor for exploitation attempts using IDS/IPS signatures (Snort SID: 44315, 44316)

DETECTION RULES:
1. Monitor for unusual POST requests with XML payloads to Struts REST endpoints
2. Look for process spawning from Java/Tomcat processes (potential RCE indicator)
3. Monitor for outbound connections from web application servers to unusual destinations
4. Check for indicators of XStream deserialization attacks in application logs
5. Deploy YARA rules for known Struts exploitation tools
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تثبيتات Apache Struts في بيئتكم، خاصة تلك التي تستخدم إضافة REST (struts2-rest-plugin)
2. ترقية Apache Struts إلى الإصدار 2.5.13 أو أحدث فوراً
3. إذا لم يكن التصحيح الفوري ممكناً، قم بإزالة أو تعطيل إضافة Struts REST إذا لم تكن مطلوبة

الضوابط التعويضية:
1. تطبيق قواعد جدار حماية تطبيقات الويب (WAF) لحظر حمولات إلغاء التسلسل الخبيثة التي تستهدف نقاط نهاية Struts REST
2. حظر رؤوس Content-Type التي تحتوي على 'application/xml' على مستوى WAF لنقاط نهاية Struts REST إذا لم يكن XML مطلوباً
3. تقييد الوصول الشبكي لتطبيقات Struts باستخدام تجزئة الشبكة
4. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS

قواعد الكشف:
1. مراقبة طلبات POST غير العادية مع حمولات XML لنقاط نهاية Struts REST
2. البحث عن عمليات تنشأ من عمليات Java/Tomcat (مؤشر محتمل لتنفيذ التعليمات البرمجية عن بُعد)
3. مراقبة الاتصالات الصادرة من خوادم تطبيقات الويب إلى وجهات غير عادية
4. التحقق من مؤشرات هجمات إلغاء تسلسل XStream في سجلات التطبيق
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
2-3-1 (Patch Management) 2-3-4 (Vulnerability Management) 2-5-1 (Web Application Security) 2-2-1 (Asset Management) 2-6-1 (Security Monitoring)
🔵 SAMA CSF
3.3.3 (Patch Management) 3.3.5 (Vulnerability Management) 3.4.1 (Application Security) 3.3.7 (Security Configuration) 3.5.1 (Incident Management)
🟡 ISO 27001:2022
A.8.8 (Management of technical vulnerabilities) A.8.9 (Configuration management) A.8.16 (Monitoring activities) A.8.28 (Secure coding)
🟣 PCI DSS v4.0
6.3.3 (Patch critical vulnerabilities within one month) 6.4 (Web application firewall) 6.2 (System components protected from known vulnerabilities) 11.3 (Penetration testing)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Apache:Struts
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS94.32%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-05-03
Published 2021-11-03
Source Feed cisa_kev
Views 4
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
🏷️ Tags
kev actively-exploited
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