CVE-2023-30549
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.37% probability · 30th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- lfprojects/apptainer · sylabs/singularity · redhat/enterprise linux
- Source
- security-advisories@github.com
References
- https://access.redhat.com/security/cve/cve-2022-1184Not Applicable
- https://github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97f51fd607670a9f7Patch
- https://github.com/apptainer/apptainer/releases/tag/v1.1.8Release Notes
- https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cgMitigation, Vendor Advisory
- 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-2022-1184Not Applicable
- https://security.gentoo.org/glsa/202311-13
- https://sylabs.io/2023/04/response-to-cve-2023-30549/
- https://ubuntu.com/security/CVE-2022-1184Not Applicable
- https://www.suse.com/security/cve/CVE-2022-1184.htmlNot Applicable
- https://access.redhat.com/security/cve/cve-2022-1184Not Applicable
- https://github.com/apptainer/apptainer/commit/5a4964f5ba9c8d89a0e353b97f51fd607670a9f7Patch
- https://github.com/apptainer/apptainer/releases/tag/v1.1.8Release Notes
- https://github.com/apptainer/apptainer/security/advisories/GHSA-j4rf-7357-f4cgMitigation, Vendor Advisory
- 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-2022-1184Not Applicable
- https://security.gentoo.org/glsa/202311-13
- https://sylabs.io/2023/04/response-to-cve-2023-30549/
- https://ubuntu.com/security/CVE-2022-1184Not Applicable
- https://www.suse.com/security/cve/CVE-2022-1184.htmlNot Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.