CVE-2024-27260
📋 TL;DR
This vulnerability allows a non-privileged local user on affected IBM AIX and VIOS systems to exploit a flaw in the invscout command to execute arbitrary commands with elevated privileges. This is a local privilege escalation vulnerability affecting IBM AIX 7.2, 7.3, VIOS 3.1, and VIOS 4.1 systems.
💻 Affected Systems
- IBM AIX
- IBM VIOS
📦 What is this software?
Aix by Ibm
Aix by Ibm
⚠️ Risk & Real-World Impact
Worst Case
A local attacker gains root privileges, enabling complete system compromise, data theft, persistence establishment, and lateral movement within the environment.
Likely Case
Local users escalate privileges to root, allowing them to install malware, modify system configurations, access sensitive data, or disrupt operations.
If Mitigated
With proper access controls and monitoring, impact is limited to isolated systems, with detection of privilege escalation attempts and containment of affected hosts.
🎯 Exploit Status
Exploitation requires local user access; no public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply IBM security bulletins for respective products
Vendor Advisory: https://www.ibm.com/support/pages/node/7152543
Restart Required: Yes
Instructions:
1. Review IBM advisory for specific patch details. 2. Download and apply appropriate patches from IBM Fix Central. 3. Reboot the system after patching. 4. Verify patch installation using oslevel command.
🔧 Temporary Workarounds
Remove invscout setuid permissions
linuxTemporarily remove setuid permissions from invscout binary to prevent privilege escalation
chmod u-s /usr/sbin/invscout
Restrict invscout execution
linuxLimit execution of invscout to privileged users only
chmod 750 /usr/sbin/invscout
chown root:system /usr/sbin/invscout
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts
- Monitor for invscout execution and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check if invscout has setuid permissions: ls -l /usr/sbin/invscout | grep '^...s'Check Version:
oslevel -sVerify Fix Applied:
Verify invscout no longer has setuid bit: ls -l /usr/sbin/invscout should not show 's' in user permissions📡 Detection & Monitoring
Log Indicators:
- Unusual invscout execution by non-privileged users
- Privilege escalation attempts in audit logs
Network Indicators:
- None - this is a local exploit
SIEM Query:
search 'invscout' AND 'privilege' OR 'setuid' in system logs