CVE-2021-26623
📋 TL;DR
A remote code execution vulnerability exists in the ark library due to insufficient validation of parameter length in the xheader_decode_path_record function. Attackers can exploit this to execute arbitrary code on affected systems. This affects applications using vulnerable versions of the ark library.
💻 Affected Systems
- Applications using ark library
📦 What is this software?
Bandizip by Bandisoft
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary code, install malware, exfiltrate data, or pivot to other systems.
Likely Case
Remote code execution leading to application compromise, data theft, or service disruption.
If Mitigated
Limited impact with proper network segmentation, application sandboxing, and least privilege controls in place.
🎯 Exploit Status
Exploitation requires crafting malicious input to trigger the vulnerable function
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.krcert.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=66595
Restart Required: Yes
Instructions:
1. Identify applications using ark library. 2. Check vendor advisory for patched version. 3. Update to patched version. 4. Restart affected services.
🔧 Temporary Workarounds
Network segmentation
allRestrict network access to affected applications
Input validation
allImplement additional input validation for xheader_decode_path_record function calls
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy application sandboxing or containerization to limit impact
🔍 How to Verify
Check if Vulnerable:
Check ark library version and compare against vendor advisoryCheck Version:
Check application documentation for ark library version detectionVerify Fix Applied:
Verify updated ark library version matches patched version from vendor📡 Detection & Monitoring
Log Indicators:
- Unusual process execution
- Abnormal network connections from application
Network Indicators:
- Suspicious traffic to ark library functions
- Unexpected outbound connections
SIEM Query:
Process creation from application with unusual parameters OR network connection from application to suspicious destinations