CVE-2023-30549: Unpatched extfs vulnerabilities are exploitable through suid-mode Apptainer
apptainer
Affected: apptainer · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 31% of scored CVEs
DescriptionCVE.org
Apptainer is an open source container platform for Linux. There is an ext4 use-after-free flaw that is exploitable through versions of Apptainer < 1.1.0 and installations that include apptainer-suid < 1.1.8 on older operating systems where that CVE has not been patched. That includes Red Hat Enterprise Linux 7, Debian 10 buster (unless the linux-5.10 package is installed), Ubuntu 18.04 bionic and Ubuntu 20.04 focal. Use-after-free flaws in the kernel can be used to attack the kernel for denial of service and potentially for privilege escalation. Apptainer 1.1.8 includes a patch that by default disables mounting of extfs filesystem types in setuid-root mode, while continuing to allow mounting of extfs filesystems in non-setuid "rootless" mode using fuse2fs. Some workarounds are possible. Either do not install apptainer-suid (for versions 1.1.0 through 1.1.7) or set `allow setuid = no` in apptainer.conf. This requires having unprivileged user namespaces enabled and except for apptainer 1.1.x versions will disallow mounting of sif files, extfs files, and squashfs files in addition to other, less significant impacts. (Encrypted sif files are also not supported unprivileged in apptainer 1.1.x.). Alternatively, use the `limit containers` options in apptainer.conf/singularity.conf to limit sif files to trusted users, groups, and/or paths, and set `allow container extfs = no` to disallow mounting of extfs overlay files. The latter option by itself does not disallow mounting of extfs overlay partitions inside SIF files, so that's why the former options are also needed.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- apptainer · apptainer< 1.1.8
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Published
- April 2023
CoverageNo articles yet
No CyberSIXT article names CVE-2023-30549 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-416cwe.mitre.org
- github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-735github.com
- github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97fgithub.com
- github.com/torvalds/linux/commit/2220eaf90992c11d888fe771055d4degithub.com
- github.com/torvalds/linux/commit/4f04351888a83e595571de672e0a4a8github.com
- access.redhat.com/security/cve/cve-2022-1184access.redhat.com
- github.com/apptainer/apptainer/releases/tag/v1.1.8github.com
- lwn.net/Articles/932136lwn.net
- lwn.net/Articles/932137lwn.net
- security-tracker.debian.org/tracker/CVE-2022-1184security-tracker.debian.org
- sylabs.io/2023/04/response-to-cve-2023-30549sylabs.io
- ubuntu.com/security/CVE-2022-1184ubuntu.com
- suse.com/security/cve/CVE-2022-1184.htmlsuse.com
1 more reference is in the CVE record.