CVE-2025-20668
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in scp that could allow local privilege escalation. Attackers who already have System privilege can exploit this without user interaction to gain higher privileges. This affects systems using vulnerable versions of scp.
💻 Affected Systems
- scp (secure copy protocol implementation)
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through local privilege escalation to root/admin access, enabling installation of persistent malware, data theft, or system destruction.
Likely Case
Local attackers with initial System privilege escalate to higher privileges to bypass security controls, access sensitive data, or maintain persistence.
If Mitigated
Limited impact if proper privilege separation and least privilege principles are enforced, though the vulnerability still provides attack surface.
🎯 Exploit Status
Exploitation requires existing System privilege but no user interaction; out-of-bounds write vulnerabilities are often straightforward to exploit once discovered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/May-2025
Restart Required: Yes
Instructions:
1. Review vendor advisory for affected versions. 2. Apply vendor-provided patch ALPS09625562. 3. Restart affected services or system. 4. Verify patch application.
🔧 Temporary Workarounds
Restrict scp usage
linuxLimit scp access to only necessary users through sudoers configuration or access controls
# Example: Restrict scp in sudoers
# visudo
# Add: username ALL=(ALL) !/usr/bin/scp
Use alternative file transfer methods
allReplace scp usage with sftp or rsync over SSH where possible
# Use sftp instead of scp
sftp user@host:/path/to/file ./local/path
# Use rsync instead
rsync -avz -e ssh user@host:/path/to/file ./local/path
🧯 If You Can't Patch
- Implement strict privilege separation and least privilege principles to limit impact
- Monitor for suspicious privilege escalation attempts and scp usage patterns
🔍 How to Verify
Check if Vulnerable:
Check scp version and compare against vendor advisory; examine if patch ALPS09625562 is appliedCheck Version:
scp -V 2>&1 | head -1Verify Fix Applied:
Verify patch application via package manager or version check; test scp functionality remains intact📡 Detection & Monitoring
Log Indicators:
- Unusual scp usage by privileged accounts
- Failed privilege escalation attempts
- Multiple scp processes from same user
Network Indicators:
- Excessive scp traffic from internal hosts
- scp connections followed by privilege changes
SIEM Query:
source="auth.log" AND (process="scp" AND user IN privileged_users) OR (event="sudo" AND command="scp")