cve/2019/CVE-2019-6454.md

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).

POC

Reference

• http://www.openwall.com/lists/oss-security/2021/07/20/2

Github

• https://github.com/fbreton/lacework
• https://github.com/flyrev/security-scan-ci-presentation