CVE-2023-30549
📋 TL;DR
This CVE describes a use-after-free vulnerability in the ext4 filesystem that affects Apptainer container platform. It allows attackers to potentially escalate privileges or cause denial of service by exploiting the flaw through vulnerable Apptainer installations. Affected systems include Apptainer versions before 1.1.0 and apptainer-suid before 1.1.8 on specific older Linux distributions.
💻 Affected Systems
- Apptainer
- apptainer-suid
📦 What is this software?
Apptainer by Lfprojects
⚠️ Risk & Real-World Impact
Worst Case
Privilege escalation to root access on the host system, allowing complete system compromise.
Likely Case
Denial of service through kernel crashes or system instability.
If Mitigated
Limited impact with proper workarounds, potentially reduced functionality for container operations.
🎯 Exploit Status
Exploitation requires local access and ability to execute containers. The underlying kernel vulnerability (CVE-2022-1184) must also be present and unpatched.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apptainer 1.1.8
Vendor Advisory: https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg
Restart Required: No
Instructions:
1. Update Apptainer to version 1.1.8 or later. 2. For apptainer-suid, ensure version 1.1.8 or later is installed. 3. Verify the patch disables extfs mounting in setuid-root mode by default.
🔧 Temporary Workarounds
Disable setuid mode
linuxPrevent Apptainer from running with setuid privileges
echo 'allow setuid = no' >> /etc/apptainer/apptainer.conf
Remove apptainer-suid package
linuxUninstall the setuid component for versions 1.1.0-1.1.7
apt remove apptainer-suid
yum remove apptainer-suid
Configure container restrictions
linuxLimit container execution and disable extfs mounting
echo 'allow container extfs = no' >> /etc/apptainer/apptainer.conf
Configure limit containers options in apptainer.conf
🧯 If You Can't Patch
- Apply all available workarounds: disable setuid mode, remove apptainer-suid, and configure container restrictions
- Update underlying OS kernel to patch CVE-2022-1184 if not already patched
🔍 How to Verify
Check if Vulnerable:
Check Apptainer version and apptainer-suid package version. Verify if allow setuid is enabled in apptainer.conf.Check Version:
apptainer version && dpkg -l | grep apptainer-suid || rpm -qa | grep apptainer-suidVerify Fix Applied:
Confirm Apptainer version is 1.1.8+ and apptainer-suid is 1.1.8+. Verify extfs mounting is disabled in setuid mode.📡 Detection & Monitoring
Log Indicators:
- Failed privilege escalation attempts
- Kernel panic or crash logs related to ext4
- Unusual container execution patterns with extfs filesystems
Network Indicators:
- N/A - local exploitation only
SIEM Query:
Search for: 'apptainer' AND ('setuid' OR 'extfs') AND (error OR failed OR crash)🔗 References
- https://access.redhat.com/security/cve/cve-2022-1184
- https://github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97f51fd607670a9f7
- https://github.com/apptainer/apptainer/releases/tag/v1.1.8
- https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg
- https://github.com/torvalds/linux/commit/2220eaf90992c11d888fe771055d4de3303
- https://github.com/torvalds/linux/commit/4f04351888a83e595571de672e0a4a8b74f
- https://lwn.net/Articles/932136/
- https://lwn.net/Articles/932137/
- https://security-tracker.debian.org/tracker/CVE-2022-1184
- https://security.gentoo.org/glsa/202311-13
- https://sylabs.io/2023/04/response-to-cve-2023-30549/
- https://ubuntu.com/security/CVE-2022-1184
- https://www.suse.com/security/cve/CVE-2022-1184.html
- https://access.redhat.com/security/cve/cve-2022-1184
- https://github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97f51fd607670a9f7
- https://github.com/apptainer/apptainer/releases/tag/v1.1.8
- https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cg
- https://github.com/torvalds/linux/commit/2220eaf90992c11d888fe771055d4de3303
- https://github.com/torvalds/linux/commit/4f04351888a83e595571de672e0a4a8b74f
- https://lwn.net/Articles/932136/
- https://lwn.net/Articles/932137/
- https://security-tracker.debian.org/tracker/CVE-2022-1184
- https://security.gentoo.org/glsa/202311-13
- https://sylabs.io/2023/04/response-to-cve-2023-30549/
- https://ubuntu.com/security/CVE-2022-1184
- https://www.suse.com/security/cve/CVE-2022-1184.html
