In systemd 240, bus_open_system_watch_bind_with_description in shared/bus-util.c (as used by systemd-resolved to connect to the system D-Bus instance), calls sd_bus_set_trusted, which disables access controls for incoming D-Bus messages. An unprivileged user can exploit this by executing D-Bus methods that should be restricted to privileged users, in order to change the system's DNS resolver settings.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2019-3592 advisory.

  - In systemd 240, bus_open_system_watch_bind_with_description in shared/bus-util.c (as used by systemd-     resolved to connect to the system D-Bus instance), calls sd_bus_set_trusted, which disables access     controls for incoming D-Bus messages. An unprivileged user can exploit this by executing D-Bus methods     that should be restricted to privileged users, in order to change the system's DNS resolver settings.
    (CVE-2019-15718)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2019:3592 advisory.

  - systemd: systemd-resolved allows unprivileged users to configure DNS (CVE-2019-15718)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the version of the systemd packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - In systemd 240,     bus_open_system_watch_bind_with_description in     shared/bus-util.c (as used by systemd-resolved to     connect to the system D-Bus instance), calls     sd_bus_set_trusted, which disables access controls for     incoming D-Bus messages. An unprivileged user can     exploit this by executing D-Bus methods that should be     restricted to privileged users, in order to change the     system's DNS resolver settings.(CVE-2019-15718)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the systemd packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - In systemd 240,     bus_open_system_watch_bind_with_description in     shared/bus-util.c (as used by systemd-resolved to     connect to the system D-Bus instance), calls     sd_bus_set_trusted, which disables access controls for     incoming D-Bus messages. An unprivileged user can     exploit this by executing D-Bus methods that should be     restricted to privileged users, in order to change the     system's DNS resolver settings.(CVE-2019-15718)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for systemd is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The systemd packages contain systemd, a system and service manager for Linux, compatible with the SysV and LSB init scripts. It provides aggressive parallelism capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons, and keeps track of processes using Linux cgroups. In addition, it supports snapshotting and restoring of the system state, maintains mount and automount points, and implements an elaborate transactional dependency-based service control logic. It can also work as a drop-in replacement for sysvinit.

Security Fix(es) :

* systemd: systemd-resolved allows unprivileged users to configure DNS (CVE-2019-15718)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.1 Release Notes linked from the References section.

- Update to latest release

  - Emission of Session property-changed notifications from     logind is fixed (this was breaking the switching of     sessions to and from gnome).

  - Security issue: unprivileged users were allowed to     change DNS servers configured in systemd-resolved. Now     proper polkit authorization is required     (CVE-2019-15718).

Switching ttys will work again after reboot. Otherwise, no log out or reboot is required.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Security issue: unprivileged users were allowed to     change DNS servers configured in systemd-resolved     (CVE-2019-15718)

  - hwdb entries for keyboards are updated to the latest     version (#1725717)

No need to log out or reboot.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Security issue: unprivileged users were allowed to     change DNS servers configured in systemd-resolved     (CVE-2019-15718).

  - Various minor fixes (memory issues, compat with newer     kernels, log message improvements, etc.).

  - hwdb entries for keyboards are updated to the latest     version

No need to log out or reboot.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that the systemd-resolved D-Bus interface did not enforce appropriate access controls. A local unprivileged user could exploit this to modify a system's DNS resolver settings.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
180650	Oracle Linux 8 : systemd (ELSA-2019-3592)	Nessus	Oracle Linux Local Security Checks	medium
145634	CentOS 8 : systemd (CESA-2019:3592)	Nessus	CentOS Local Security Checks	medium
132808	EulerOS Virtualization for ARM 64 3.0.5.0 : systemd (EulerOS-SA-2020-1054)	Nessus	Huawei Local Security Checks	medium
130830	EulerOS 2.0 SP8 : systemd (EulerOS-SA-2019-2121)	Nessus	Huawei Local Security Checks	medium
130557	RHEL 8 : systemd (RHSA-2019:3592)	Nessus	Red Hat Local Security Checks	medium
129651	Fedora 31 : systemd (2019-d5bd5f0aa4)	Nessus	Fedora Local Security Checks	medium
129030	Fedora 29 : systemd (2019-8a7dfdf1f3)	Nessus	Fedora Local Security Checks	medium
128535	Fedora 30 : systemd (2019-24e1d561e5)	Nessus	Fedora Local Security Checks	medium
128506	Ubuntu 18.04 LTS : systemd vulnerability (USN-4120-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2019-15718

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium