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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1684-1, DSA-4393-1
NVD severitymedium (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
systemd (PTS)jessie215-17+deb8u7vulnerable
jessie (security)215-17+deb8u13fixed
stretch (security), stretch232-25+deb9u11fixed
buster241-3fixed
sid241-4fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
systemdsource(unstable)240-6medium
systemdsourcejessie215-17+deb8u10mediumDLA-1684-1
systemdsourcestretch232-25+deb9u9mediumDSA-4393-1

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

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