A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp.
Weakness
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Systemd | Systemd_project | 240 (including) | 250.2 (excluding) |
| Systemd | Ubuntu | bionic | * |
| Systemd | Ubuntu | devel | * |
| Systemd | Ubuntu | esm-infra-legacy/trusty | * |
| Systemd | Ubuntu | esm-infra/bionic | * |
| Systemd | Ubuntu | esm-infra/focal | * |
| Systemd | Ubuntu | esm-infra/xenial | * |
| Systemd | Ubuntu | focal | * |
| Systemd | Ubuntu | hirsute | * |
| Systemd | Ubuntu | impish | * |
| Systemd | Ubuntu | trusty/esm | * |
Potential Mitigations
Related Attack Patterns
References
- https://access.redhat.com/security/cve/CVE-2021-3997
- https://bugzilla.redhat.com/show_bug.cgi?id=2024639
- https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1
- https://security.gentoo.org/glsa/202305-15
- https://www.openwall.com/lists/oss-security/2022/01/10/2
- https://access.redhat.com/security/cve/CVE-2021-3997
- https://bugzilla.redhat.com/show_bug.cgi?id=2024639
- https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1
- https://security.gentoo.org/glsa/202305-15
- https://www.openwall.com/lists/oss-security/2022/01/10/2