📄 Description (English)
Service Location Protocol (SLP) Denial-of-Service Vulnerability — The Service Location Protocol (SLP) contains a denial-of-service (DoS) vulnerability that could allow an unauthenticated, remote attacker to register services and use spoofed UDP traffic to conduct a denial-of-service (DoS) attack with a significant amplification factor.
🤖 AI Executive Summary
CVE-2023-29552 is a critical vulnerability in the Service Location Protocol (SLP) with a CVSS score of 9.0, enabling unauthenticated remote attackers to register arbitrary services and leverage spoofed UDP traffic to launch amplified Denial-of-Service attacks. The amplification factor is exceptionally high (reported up to 2200x), making this an extremely potent DDoS amplification vector. Active exploits are available in the wild, significantly elevating the risk for organizations with SLP exposed on public-facing or poorly segmented networks. Immediate action is required to disable or restrict SLP services to prevent infrastructure disruption.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 19, 2026 00:20
🇸🇦 Saudi Arabia Impact Assessment
Saudi organizations across multiple critical sectors face significant risk from this vulnerability. Energy sector entities including Saudi Aramco and affiliated industrial networks may have legacy SLP-enabled devices (VMware ESXi, printers, network appliances) exposed internally or externally. Government entities under NCA oversight running enterprise infrastructure with SLP-enabled services are at risk of service disruption. Banking and financial institutions regulated by SAMA could face availability impacts affecting online banking and payment processing systems. Telecom providers such as STC and Mobily, which operate large-scale infrastructure, may have SLP-enabled network management systems exposed. The high amplification factor makes this particularly dangerous for organizations with limited DDoS mitigation capabilities, and the availability of public exploits means threat actors including regional hacktivist groups could weaponize this against Saudi critical infrastructure.
🏢 Affected Saudi Sectors
Energy
Government
Banking
Telecom
Healthcare
Transportation
Manufacturing
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS (0-24 hours):
1. Audit all internet-facing and DMZ assets for SLP service exposure (UDP/TCP port 427).
2. Block UDP and TCP port 427 at perimeter firewalls and internal network segmentation points immediately.
3. Disable SLP service on all hosts where it is not operationally required — on Linux: 'systemctl stop slpd && systemctl disable slpd'; on Windows: disable 'Computer Browser' service if applicable.
PATCHING GUIDANCE:
4. Apply vendor-specific patches for affected products (VMware ESXi, HP, IBM, and other SLP-enabled products) — consult vendor advisories for specific patch versions.
5. For VMware ESXi, follow VMware VMSA-2023-0013 advisory and apply available patches.
6. Prioritize patching internet-exposed and DMZ-resident systems first.
COMPENSATING CONTROLS:
7. If SLP cannot be disabled, implement strict ACLs to allow SLP traffic only from trusted internal subnets.
8. Deploy ingress/egress UDP source address validation (BCP38) to mitigate spoofed traffic amplification.
9. Enable DDoS scrubbing services or upstream ISP-level rate limiting for UDP port 427.
10. Segment SLP-enabled devices into isolated VLANs with no external routing.
DETECTION RULES:
11. Create SIEM alerts for unusual spikes in UDP port 427 traffic.
12. Monitor for SLP service registration requests from unexpected or external IP addresses.
13. Deploy Snort/Suricata rule: alert udp any any -> any 427 (msg:'SLP Potential Amplification Abuse'; threshold:type both, track by_src, count 100, seconds 10; sid:9000001;).
14. Review NetFlow/IPFIX data for asymmetric UDP traffic patterns indicative of amplification.
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية (خلال 0-24 ساعة):
1. مراجعة جميع الأصول المكشوفة على الإنترنت ومناطق DMZ للكشف عن خدمات SLP المعرّضة (المنفذ 427 UDP/TCP).
2. حجب المنفذ 427 عبر UDP وTCP فوراً على جدران الحماية الحدودية ونقاط تجزئة الشبكة الداخلية.
3. تعطيل خدمة SLP على جميع المضيفين الذين لا يحتاجونها تشغيلياً — على Linux: 'systemctl stop slpd && systemctl disable slpd'؛ وعلى Windows: تعطيل خدمة 'Computer Browser' إن وجدت.
إرشادات التصحيح:
4. تطبيق التصحيحات الخاصة بالبائعين للمنتجات المتأثرة (VMware ESXi وHP وIBM وغيرها من المنتجات المدعومة بـ SLP).
5. بالنسبة لـ VMware ESXi، اتباع نشرة VMSA-2023-0013 وتطبيق التصحيحات المتاحة.
6. إعطاء الأولوية لتصحيح الأنظمة المكشوفة على الإنترنت ومناطق DMZ أولاً.
ضوابط التعويض:
7. إذا تعذّر تعطيل SLP، تطبيق قوائم تحكم صارمة للسماح بحركة مرور SLP من الشبكات الداخلية الموثوقة فقط.
8. نشر التحقق من عنوان المصدر UDP (BCP38) للحد من تضخيم حركة المرور المزيفة.
9. تفعيل خدمات تنقية DDoS أو تحديد معدل على مستوى مزود الإنترنت للمنفذ 427 UDP.
10. عزل الأجهزة المدعومة بـ SLP في شبكات VLAN معزولة بدون توجيه خارجي.
قواعد الكشف:
11. إنشاء تنبيهات SIEM للارتفاعات غير المعتادة في حركة مرور المنفذ 427 UDP.
12. مراقبة طلبات تسجيل خدمة SLP من عناوين IP خارجية أو غير متوقعة.
13. نشر قاعدة Snort/Suricata للكشف عن محاولات الاستغلال.
14. مراجعة بيانات NetFlow/IPFIX للكشف عن أنماط حركة UDP غير المتماثلة الدالة على التضخيم.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC-1-4-2: Cybersecurity Risk Management — identification and treatment of vulnerabilities in network services
ECC-2-3-1: Network Security — securing network protocols and disabling unnecessary services
ECC-2-3-3: Network Security — protection against denial-of-service attacks
ECC-2-6-1: Vulnerability Management — timely patching of critical vulnerabilities
ECC-3-3-2: Infrastructure Protection — hardening of network-facing services
🔵 SAMA CSF
3.3.5 — Vulnerability Management: Identification and remediation of critical vulnerabilities in network services
3.3.6 — Patch Management: Timely application of security patches for critical systems
3.3.9 — Network Security: Restriction of unnecessary protocols and services
3.3.10 — DDoS Protection: Controls to detect and mitigate denial-of-service attacks
3.4.2 — Cyber Incident Management: Response procedures for availability-impacting attacks
🟡 ISO 27001:2022
A.8.8 — Management of technical vulnerabilities: Timely identification and remediation of SLP vulnerability
A.8.20 — Networks security: Disabling unnecessary network services and protocols
A.8.21 — Security of network services: Protection of network services from abuse and amplification attacks
A.8.22 — Segregation of networks: Network segmentation to isolate SLP-enabled devices
A.5.30 — ICT readiness for business continuity: Ensuring availability against DoS threats
🟣 PCI DSS v4.0
Requirement 1.3.2 — Restrict inbound and outbound traffic to only that which is necessary (block port 427)
Requirement 6.3.3 — All system components are protected from known vulnerabilities by patching
Requirement 12.3.2 — Targeted risk analysis for vulnerabilities affecting payment system availability
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
IETF:Service Location Protocol (SLP)