Vulnerability Report

CVE-2023-30549

Title: Sylabs Singularity Auth Bypass

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2023-30549.

CWE Category CWE-416
Published Date Apr 25, 2023
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 7.1 CVSS v3.1
Exploit Probability (EPSS)
0.37%

Vulnerability Summary

CVE-2023-30549: 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.

Impacted Vendors

S
sylabs 1
L
lfprojects 1

Reference Links

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
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.1
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2023-30549 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected Stack

No specific products linked.