CVE-2019-6454

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CVE-2019-6454

Summary:

Details: 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: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N67IOBOTDOMVNQJ5QRU2MXLEECXPGNVJ/, http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00070.html, http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html, http://www.openwall.com/lists/oss-security/2019/02/19/1, http://www.securityfocus.com/bid/107081, https://access.redhat.com/errata/RHSA-2019:0368, https://access.redhat.com/errata/RHSA-2019:0990, https://access.redhat.com/errata/RHSA-2019:1322, https://access.redhat.com/errata/RHSA-2019:1502, https://access.redhat.com/errata/RHSA-2019:2805, https://lists.debian.org/debian-lts-announce/2019/02/msg00031.html, https://security.netapp.com/advisory/ntap-20190327-0004/, https://usn.ubuntu.com/3891-1/, https://www.debian.org/security/2019/dsa-4393, http://www.openwall.com/lists/oss-security/2019/02/18/3, https://github.com/systemd/systemd/commits/master/src/libsystemd/sd-bus/bus-objects.c, https://kc.mcafee.com/corporate/index?page=content&id=SB10278, http://www.openwall.com/lists/oss-security/2021/07/20/2