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Vulnerabilities

CVE-2016-20047

High
EKG Gadu 1.9~pre+r2855-3+b1 contains a local buffer overflow vulnerability in the username handling that allows local attackers to execute arbitrary code by supplying an oversized username string. Att
CWE-787 — Weakness Type
Published: Mar 28, 2026  ·  Modified: Apr 4, 2026  ·  Source: NVD
CVSS v3
8.4
🔗 NVD Official
📄 Description (English)

EKG Gadu 1.9~pre+r2855-3+b1 contains a local buffer overflow vulnerability in the username handling that allows local attackers to execute arbitrary code by supplying an oversized username string. Attackers can trigger the overflow in the strlcpy function by passing a crafted buffer exceeding 258 bytes to overwrite the instruction pointer and execute shellcode with user privileges.

🤖 AI Executive Summary

CVE-2016-20047 is a local buffer overflow vulnerability in EKG Gadu 1.9 affecting username handling that allows local attackers to execute arbitrary code with user privileges. The vulnerability exploits improper bounds checking in the strlcpy function when processing usernames exceeding 258 bytes. With a CVSS score of 8.4 and no available patch, this poses a significant risk to systems running vulnerable versions, though exploitation requires local access.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 06:58
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi organizations using EKG Gadu for instant messaging or communication purposes. Government agencies (NCA, NCSC), financial institutions (SAMA-regulated banks), and telecommunications companies (STC, Mobily) that may have deployed this legacy software are at risk. The local nature of the exploit limits exposure but poses insider threat risks. Healthcare organizations and critical infrastructure operators using this software for internal communications could face operational disruption if compromised.
🏢 Affected Saudi Sectors
Government Banking and Financial Services Telecommunications Healthcare Critical Infrastructure
⚖️ Saudi Risk Score (AI)
6.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all systems running EKG Gadu 1.9 or earlier versions across your organization
2. Restrict local access to systems running vulnerable versions through access controls and privilege management
3. Implement application whitelisting to prevent unauthorized code execution
4. Monitor for suspicious process execution and memory access patterns

Patching Guidance:
5. Since no official patch is available, consider upgrading to alternative instant messaging solutions or newer versions if available
6. If upgrade is not immediately possible, apply the following compensating controls:
- Disable EKG Gadu if not critical to operations
- Run the application in a sandboxed environment with restricted privileges
- Implement strict input validation at the application wrapper level

Detection Rules:
7. Monitor for strlcpy function calls with buffer sizes exceeding 258 bytes
8. Alert on any process attempting to write to stack memory regions
9. Implement IDS/IPS rules to detect oversized username strings in EKG Gadu protocol traffic
10. Enable core dump analysis for EKG Gadu process crashes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. قم بحصر جميع الأنظمة التي تقوم بتشغيل EKG Gadu 1.9 أو الإصدارات الأقدم عبر مؤسستك
2. قيد الوصول المحلي إلى الأنظمة الضعيفة من خلال عناصر التحكم في الوصول وإدارة الامتيازات
3. تطبيق قائمة بيضاء للتطبيقات لمنع تنفيذ الكود غير المصرح به
4. مراقبة تنفيذ العمليات المريبة وأنماط الوصول إلى الذاكرة

إرشادات التصحيح:
5. نظراً لعدم توفر تصحيح رسمي، فكر في الترقية إلى حلول المراسلة الفورية البديلة أو الإصدارات الأحدث إن أمكن
6. إذا لم تكن الترقية ممكنة على الفور، طبق عناصر التحكم التعويضية التالية:
- تعطيل EKG Gadu إذا لم يكن حرجاً للعمليات
- تشغيل التطبيق في بيئة معزولة برمجياً مع امتيازات مقيدة
- تطبيق التحقق الصارم من صحة الإدخال على مستوى غلاف التطبيق

قواعد الكشف:
7. مراقبة استدعاءات دالة strlcpy بأحجام مخزن مؤقت تتجاوز 258 بايت
8. تنبيه أي عملية تحاول الكتابة إلى مناطق ذاكرة المكدس
9. تطبيق قواعد IDS/IPS للكشف عن سلاسل أسماء المستخدمين الكبيرة في حركة بروتوكول EKG Gadu
10. تفعيل تحليل core dump لأعطال عملية EKG Gadu
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 - System change control and configuration management ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - User endpoint devices protection
🔵 SAMA CSF
SAMA CSF ID.BE-5 - Organizational resilience and incident management SAMA CSF PR.DS-6 - Data security and integrity controls SAMA CSF DE.CM-1 - Detection and monitoring of anomalous activities
🟡 ISO 27001:2022
ISO 27001:2022 A.12.2.1 - Endpoint protection ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities and exposures ISO 27001:2022 A.14.2.1 - Change control procedures
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates (if payment systems affected)
📊 CVSS Score
8.4
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.4
CWECWE-787
EPSS0.02%
Exploit No
Patch ✗ No
Published 2026-03-28
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
6.2
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-787
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