CVE-2019-6454

Name	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).
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-1684-1, DSA-4393-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
systemd (PTS)	bullseye	247.3-7+deb11u5	fixed
	bullseye (security)	247.3-7+deb11u6	fixed
	bookworm	252.31-1~deb12u1	fixed
	trixie	257.1-4	fixed
	sid	257.1-5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
systemd	source	jessie	215-17+deb8u10	DLA-1684-1
systemd	source	stretch	232-25+deb9u9	DSA-4393-1
systemd	source	(unstable)	240-6

Notes

https://www.openwall.com/lists/oss-security/2019/02/18/3
https://github.com/systemd/systemd/commit/798ebaf9aea9b8ae3b8a0cc2702bc8de71acb3c6
https://github.com/systemd/systemd/commit/6d586a13717ae057aa1b4127400c3de61cd5b9e7
https://github.com/systemd/systemd/commit/f519a19bcd5afe674a9b8fc462cd77d8bad403c1