📄 Description (English)
Axessh 4.2 contains a stack-based buffer overflow vulnerability in the log file name field that allows local attackers to execute arbitrary code by supplying an excessively long filename. Attackers can overflow the buffer at offset 214 bytes to overwrite the instruction pointer and execute shellcode with system privileges.
🤖 AI Executive Summary
CVE-2019-25607 is a critical stack-based buffer overflow vulnerability in Axessh 4.2 affecting the log file name field, allowing local attackers to execute arbitrary code with system privileges. With a CVSS score of 8.4 and no available patch, this vulnerability poses significant risk to organizations using Axessh for SSH access management. The vulnerability requires local access but enables complete system compromise through instruction pointer overwriting.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 09:21
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi government agencies, financial institutions, and critical infrastructure operators using Axessh for SSH access management and logging. High-risk sectors include: SAMA-regulated banking institutions relying on Axessh for secure administrative access, NCA-supervised government networks, Saudi Aramco and energy sector facilities using Axessh for infrastructure management, STC and telecom operators managing network access, and healthcare facilities using SSH-based remote administration. The local attack vector limits exposure but poses severe risk to insider threats and compromised user accounts within these organizations.
🏢 Affected Saudi Sectors
Banking and Financial Services (SAMA-regulated)
Government and Public Administration (NCA-supervised)
Energy and Utilities (Saudi Aramco, KACARE)
Telecommunications (STC, Mobily, Zain)
Healthcare and Medical Facilities
Critical Infrastructure
Defense and Security Agencies
🎯 MITRE ATT&CK Techniques
T1190 - Exploit Public-Facing Application
T1548 - Abuse Elevation Control Mechanism
T1548.004 - Abuse Elevation Control Mechanism: Elevated Execution with Prompt
T1543 - Create or Modify System Process
T1055 - Process Injection
T1574 - Hijack Execution Flow
T1134 - Access Token Manipulation
T1547 - Boot or Logon Autostart Execution
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Inventory all systems running Axessh 4.2 and document their criticality and network exposure
2. Restrict local access to systems running Axessh through privilege escalation controls and account management
3. Implement strict file permission controls on log directories to prevent unauthorized log file creation
4. Monitor for suspicious process execution and stack-based exploitation attempts
Compensating Controls (until patch available):
1. Disable Axessh logging functionality if operationally feasible, or redirect logs to read-only mounted filesystems
2. Implement application whitelisting to prevent arbitrary code execution
3. Deploy ASLR (Address Space Layout Randomization) and DEP/NX protections at OS level
4. Restrict local user access through strict SSH key management and disable password-based authentication
5. Implement file integrity monitoring on Axessh binaries and configuration files
Detection Rules:
1. Monitor for processes spawned from Axessh with unexpected parent-child relationships
2. Alert on attempts to create log files with excessively long filenames (>256 characters)
3. Track unauthorized modifications to Axessh process memory or instruction pointer changes
4. Log all local SSH sessions and failed authentication attempts
5. Monitor system calls for stack manipulation and shellcode execution patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حصر جميع الأنظمة التي تعمل بـ Axessh 4.2 وتوثيق أهميتها والتعرض على الشبكة
2. تقييد الوصول المحلي للأنظمة التي تعمل بـ Axessh من خلال عناصر تحكم تصعيد الامتيازات وإدارة الحسابات
3. تطبيق عناصر تحكم صارمة في أذونات الملفات على دلائل السجلات لمنع إنشاء ملفات سجل غير مصرح بها
4. مراقبة محاولات تنفيذ العمليات المريبة والاستغلال القائم على المكدس
عناصر التحكم التعويضية (حتى توفر التصحيح):
1. تعطيل وظيفة تسجيل Axessh إن أمكن من الناحية التشغيلية، أو إعادة توجيه السجلات إلى أنظمة ملفات مثبتة بقراءة فقط
2. تطبيق قائمة بيضاء للتطبيقات لمنع تنفيذ الكود العشوائي
3. نشر ASLR و DEP/NX على مستوى نظام التشغيل
4. تقييد وصول المستخدمين المحليين من خلال إدارة مفاتيح SSH الصارمة وتعطيل المصادقة القائمة على كلمة المرور
5. تطبيق مراقبة سلامة الملفات على ملفات Axessh الثنائية وملفات التكوين
قواعد الكشف:
1. مراقبة العمليات المنبثقة من Axessh مع علاقات الوالد والطفل غير المتوقعة
2. التنبيه على محاولات إنشاء ملفات سجل بأسماء طويلة بشكل مفرط (>256 حرف)
3. تتبع التعديلات غير المصرح بها على ذاكرة عملية Axessh أو تغييرات مؤشر التعليمات
4. تسجيل جميع جلسات SSH المحلية ومحاولات المصادقة الفاشلة
5. مراقبة استدعاءات النظام لأنماط معالجة المكدس وتنفيذ shellcode
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.5.2.1 - User access management and privilege control
A.5.3.1 - Cryptographic controls for SSH access
A.5.4.1 - Logging and monitoring of access events
A.5.5.1 - Vulnerability management and patching
🔵 SAMA CSF
Identify - Asset Management (ID.AM-1, ID.AM-2)
Protect - Access Control (PR.AC-1, PR.AC-2, PR.AC-3)
Protect - Data Security (PR.DS-1, PR.DS-2)
Detect - Anomalies and Events (DE.AE-1, DE.AE-2)
Respond - Response Planning (RS.RP-1)
🟡 ISO 27001:2022
A.5.1.1 - Policies for information security
A.5.2.1 - User registration and access rights
A.5.2.2 - Privileged access rights
A.5.2.3 - User access review
A.5.3.1 - Cryptography
A.5.4.1 - Event logging
A.5.4.2 - Protection of log information
A.8.1.1 - Vulnerability management
🟣 PCI DSS v4.0.1
Requirement 2.1 - Change default passwords
Requirement 6.2 - Security patches and updates
Requirement 7.1 - Limit access to system components
Requirement 8.1 - User identification and authentication
Requirement 10.2 - Implement automated audit trails
🔗 References & Sources 6
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http://www.labf.com
disclosure@vulncheck.com
http://www.labf.com/download/axessh.exe
disclosure@vulncheck.com
https://www.exploit-db.com/exploits/46858
disclosure@vulncheck.com
https://www.exploit-db.com/exploits/46922
disclosure@vulncheck.com
https://www.exploit-db.com/shellcodes/46281
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/axessh-local-stack-based-buffer-overflow-via-log-f...
disclosure@vulncheck.com