2019-03-21 17:01:08 2019-06-04 19:29:03

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).

Vector

LOCAL

Complexity

LOW

Authentication

NONE

Confidentiality

NONE

Integrity

NONE

Availability

COMPLETE