CVE-2025-6218
📋 TL;DR
This vulnerability in WinRAR allows attackers to execute arbitrary code by tricking users into opening malicious archive files containing specially crafted file paths. The directory traversal flaw enables attackers to write files to unintended locations, potentially leading to remote code execution. All users running vulnerable versions of WinRAR are affected.
💻 Affected Systems
- RARLAB WinRAR
📦 What is this software?
Winrar by Rarlab
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, data theft, ransomware deployment, and lateral movement within networks.
Likely Case
Malware installation leading to data exfiltration, credential theft, or system disruption for individual users who open malicious archives.
If Mitigated
Limited impact with proper security controls like application whitelisting, restricted user privileges, and network segmentation preventing lateral movement.
🎯 Exploit Status
Exploit requires user to open malicious archive. APT groups have been observed exploiting this vulnerability in targeted attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WinRAR 7.00 and later
Vendor Advisory: https://www.win-rar.com/singlenewsview.html?&tx_ttnews%5Btt_news%5D=276&cHash=388885bd3908a40726f535c026f94eb6
Restart Required: No
Instructions:
1. Download WinRAR 7.00 or later from official website. 2. Run installer. 3. Follow installation prompts. 4. Verify version in Help > About WinRAR.
🔧 Temporary Workarounds
Disable automatic archive extraction
windowsPrevent WinRAR from automatically extracting archives by changing file association settings
Use alternative archive software
windowsTemporarily use 7-Zip or other archive tools until patching is complete
🧯 If You Can't Patch
- Implement application control/whitelisting to block WinRAR execution
- Restrict user privileges to prevent code execution in sensitive directories
🔍 How to Verify
Check if Vulnerable:
Open WinRAR, go to Help > About WinRAR, check if version is below 7.00Check Version:
"C:\Program Files\WinRAR\WinRAR.exe" /?Verify Fix Applied:
Open WinRAR, go to Help > About WinRAR, confirm version is 7.00 or higher📡 Detection & Monitoring
Log Indicators:
- WinRAR process spawning unusual child processes
- File writes to unexpected directories by WinRAR process
- Archive files with suspicious path patterns in file names
Network Indicators:
- WinRAR process making unexpected network connections after archive extraction
- Downloads of archive files from suspicious sources
SIEM Query:
Process Creation where ParentImage contains 'winrar.exe' and (CommandLine contains 'powershell' or CommandLine contains 'cmd' or CommandLine contains 'wscript')🔗 References
- https://www.win-rar.com/singlenewsview.html?&tx_ttnews%5Btt_news%5D=276&cHash=388885bd3908a40726f535c026f94eb6
- https://www.zerodayinitiative.com/advisories/ZDI-25-409/
- https://foresiet.com/blog/apt-c-08-winrar-directory-traversal-exploit/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-6218
- https://www.secpod.com/blog/archive-terror-dissecting-the-winrar-cve-2025-6218-exploit-apt-c-08s-stealth-move/
