CVE-2024-10041
📋 TL;DR
This CVE describes a speculative execution vulnerability in PAM (Pluggable Authentication Modules) where an attacker can manipulate branch prediction to speculatively execute ROP chains, potentially leaking sensitive authentication data like passwords from /etc/shadow. Systems using vulnerable PAM versions for authentication are affected. The attack requires local access to trigger the victim program via stdin.
💻 Affected Systems
- PAM (Pluggable Authentication Modules)
📦 What is this software?
Linux Pam by Linux Pam
⚠️ Risk & Real-World Impact
Worst Case
Leakage of password hashes from /etc/shadow, potentially enabling credential theft and privilege escalation.
Likely Case
Limited information disclosure requiring specific conditions and attacker persistence, with partial data leakage.
If Mitigated
Minimal impact with proper access controls, patched systems, and speculative execution mitigations in place.
🎯 Exploit Status
Exploitation involves speculative execution techniques similar to Spectre variants; practical exploitation may be challenging.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisories (RHSA-2024:10379, RHSA-2024:11250, RHSA-2024:9941) for specific patched versions.
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2024-10041
Restart Required: Yes
Instructions:
1. Check your distribution's security advisories. 2. Update PAM packages using your package manager (e.g., 'yum update pam' for RHEL). 3. Reboot the system to ensure changes take effect.
🔧 Temporary Workarounds
Restrict local access
linuxLimit user access to systems to reduce attack surface for local exploitation.
Enable speculative execution mitigations
linuxUse kernel parameters to mitigate speculative execution vulnerabilities.
Add 'spectre_v2=on' to kernel boot parameters
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges.
- Monitor system logs for unusual authentication attempts or privilege escalation activities.
🔍 How to Verify
Check if Vulnerable:
Check PAM package version against patched versions in Red Hat advisories: 'rpm -q pam'Check Version:
rpm -q pamVerify Fix Applied:
Verify PAM package is updated to patched version: 'rpm -q pam' and compare with advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication failures
- Suspicious local process execution patterns
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Search for failed PAM authentication events followed by unusual process execution.