CVE-2019-6454
Description
An issue was discovered in sd-bus in systemd 239. bus_process_object() in libsystemd/sd-bus/bus-objects.c allocates a variable-length stack buffer for temporarily storing the object path of incoming D-Bus messages. An unprivileged local user can exploit this by sending a specially crafted message to PID1, causing the stack pointer to jump over the stack guard pages into an unmapped memory region and trigger a denial of service (systemd PID1 crash and kernel panic).
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-6454
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-6454.html
Vendor advisory: arch — https://security.archlinux.org/ASA-201902-24
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 241.7-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 240-6 |
| debian | bullseye | fixed | 240-6 |
| debian | forky | fixed | 240-6 |
| debian | sid | fixed | 240-6 |
| debian | trixie | fixed | 240-6 |
References
Verify integrity in audit chain (admin only). AS-IS.