An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when many entries are sent to the journal socket. A local attacker, or a remote one if systemd-journal-remote is used, may use this flaw to crash systemd-journald or execute code with journald privileges.
https://www.qualys.com/2019/01/09/system-down/system-down.txt
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16865
https://usn.ubuntu.com/3855-1/
http://www.securityfocus.com/bid/106525
https://www.debian.org/security/2019/dsa-4367
https://access.redhat.com/errata/RHSA-2019:0049
https://security.netapp.com/advisory/ntap-20190117-0001/
https://lists.debian.org/debian-lts-announce/2019/01/msg00016.html
https://access.redhat.com/errata/RHSA-2019:0204
https://access.redhat.com/errata/RHSA-2019:0271
https://access.redhat.com/errata/RHSA-2019:0342
https://access.redhat.com/errata/RHSA-2019:0361
https://security.gentoo.org/glsa/201903-07
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://access.redhat.com/errata/RHBA-2019:0327
http://www.openwall.com/lists/oss-security/2019/05/10/4
https://seclists.org/bugtraq/2019/May/25
http://packetstormsecurity.com/files/152841/System-Down-A-systemd-journald-Exploit.html
http://seclists.org/fulldisclosure/2019/May/21
https://access.redhat.com/errata/RHSA-2019:2402
http://www.openwall.com/lists/oss-security/2021/07/20/2
Source: MITRE
Published: 2019-01-11
Updated: 2023-02-02
Type: CWE-770
Base Score: 4.6
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.9
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH