Out-of-Bounds

Affecting systemd package, versions <229-4ubuntu21.16

Overview

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).

References

• CONFIRM
• Debian Security Advisory
• Debian Security Announcement
• Debian Security Tracker
• Fedora Security Update
• GitHub Commit
• Netapp Security Advisory
• OSS security Advisory
• OSS security Advisory
• OpenSuse Security Announcement
• OpenSuse Security Announcement
• REDHAT
• REDHAT
• RHSA Security Advisory
• RHSA Security Advisory
• RHSA Security Advisory
• Security Focus
• Ubuntu CVE Tracker
• Ubuntu Security Advisory