CVE-2019-6454

NameCVE-2019-6454
DescriptionAn 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1684-1, DSA-4393-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
systemd (PTS)jessie, jessie (lts)215-17+deb8u15fixed
stretch (security)232-25+deb9u14fixed
stretch (lts), stretch232-25+deb9u17fixed
buster, buster (lts)241-7~deb10u11fixed
buster (security)241-7~deb10u10fixed
bullseye247.3-7+deb11u5fixed
bullseye (security)247.3-7+deb11u6fixed
bookworm252.30-1~deb12u2fixed
sid, trixie256.7-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
systemdsourcewheezy(not affected)
systemdsourcejessie215-17+deb8u10DLA-1684-1
systemdsourcestretch232-25+deb9u9DSA-4393-1
systemdsource(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
[wheezy] - systemd <not-affected> (Vulnerable code introduced later)

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