CVE-2019-6454

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).

CVSS v3.1 NVD

5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 NVD

4.9 MEDIUMAV:L/AC:L/Au:N/C:N/I:N/A:C

EPSS

2.04% chance of exploitation in the next 30 days, 81st percentile

Published

2019-03-17

Updated

2024-08-04

Proof-of-concept exploits (1)

• http://www.openwall.com/lists/oss-security/2021/07/20/2

Security advisories

• 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/2019/02/18/3
• 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
• systemd/systemd/commits/master/src/libsystemd/sd-bus/bus-objects.c
• https://kc.mcafee.com/corporate/index?page=content&id=SB10278
• 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

References

• CVE Record
• NVD entry