It was discovered that a systemd service that uses DynamicUser property can get new privileges through the execution of SUID binaries, which would allow to create binaries owned by the service transient group with the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a potentially different service in the future, when the GID will be recycled.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-1794 advisory.

  - It was discovered that a systemd service that uses DynamicUser property can create a SUID/SGID binary that     would be allowed to run as the transient service UID/GID even after the service is terminated. A local     attacker may use this flaw to access resources that will be owned by a potentially different service in     the future, when the UID/GID will be recycled. (CVE-2019-3843)

  - It was discovered that a systemd service that uses DynamicUser property can get new privileges through the     execution of SUID binaries, which would allow to create binaries owned by the service transient group with     the setgid bit set. A local attacker may use this flaw to access resources that will be owned by a     potentially different service in the future, when the GID will be recycled. (CVE-2019-3844)

Note that Nessus has not tested for these issues 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 multiple vulnerabilities as referenced in the CESA-2020:1794 advisory.

  - systemd: services with DynamicUser can create SUID/SGID binaries (CVE-2019-3843)

  - systemd: services with DynamicUser can get new privileges and create SGID binaries (CVE-2019-3844)

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

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1794 advisory.

  - systemd: services with DynamicUser can create SUID/SGID binaries (CVE-2019-3843)

  - systemd: services with DynamicUser can get new privileges and create SGID binaries (CVE-2019-3844)

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

It was discovered that systemd incorrectly handled certain PIDFile files. A local attacker could possibly use this issue to trick systemd into killing privileged processes. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-16888)

It was discovered that systemd incorrectly handled certain udevadm trigger commands. A local attacker could possibly use this issue to cause systemd to consume resources, leading to a denial of service.
(CVE-2019-20386)

Jann Horn discovered that systemd incorrectly handled services that use the DynamicUser property. A local attacker could possibly use this issue to access resources owned by a different service in the future.
This issue only affected Ubuntu 18.04 LTS. (CVE-2019-3843, CVE-2019-3844)

Tavis Ormandy discovered that systemd incorrectly handled certain Polkit queries. A local attacker could use this issue to cause systemd to crash, resulting in a denial of service, or possibly execute arbitrary code and escalate privileges. (CVE-2020-1712).

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.

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

  - It was discovered that a systemd service that uses     DynamicUser property can create a SUID/SGID binary that     would be allowed to run as the transient service     UID/GID even after the service is terminated. A local     attacker may use this flaw to access resources that     will be owned by a potentially different service in the     future, when the UID/GID will be     recycled.(CVE-2019-3843)

  - It was discovered that a systemd service that uses     DynamicUser property can get new privileges through the     execution of SUID binaries, which would allow to create     binaries owned by the service transient group with the     setgid bit set. A local attacker may use this flaw to     access resources that will be owned by a potentially     different service in the future, when the GID will be     recycled.(CVE-2019-3844)

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 of the systemd package has been released.

This update for systemd fixes the following issues :

Security issues fixed :

CVE-2019-3842: Fixed a privilege escalation in pam_systemd which could be exploited by a local user (bsc#1132348).

CVE-2019-6454: Fixed a denial of service via crafted D-Bus message (bsc#1125352).

CVE-2019-3843, CVE-2019-3844: Fixed a privilege escalation where services with DynamicUser could gain new privileges or create SUID/SGID binaries (bsc#1133506, bsc#1133509).

Non-security issued fixed: logind: fix killing of scopes (bsc#1125604)

namespace: make MountFlags=shared work again (bsc#1124122)

rules: load drivers only on 'add' events (bsc#1126056)

sysctl: Don't pass null directive argument to '%s' (bsc#1121563)

systemd-coredump: generate a stack trace of all core dumps and log into the journal (jsc#SLE-5933)

udevd: notify when max number value of children is reached only once per batch of events (bsc#1132400)

sd-bus: bump message queue size again (bsc#1132721)

Do not automatically online memory on s390x (bsc#1127557)

Removed sg.conf (bsc#1036463)

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

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

  - It was discovered that a systemd service that uses     DynamicUser property can get new privileges through the     execution of SUID binaries, which would allow a     cooperating process to create binaries owned by the     service transient group with the setgid bit set. A     local attacker may use this flaw to access resources     that will be owned by a potentially different service     in the future when the GID will be     recycled.(CVE-2019-3844)

  - It was discovered that a systemd service that uses     DynamicUser property can create a SUID/SGID binary that     would be allowed to run as the transient service     UID/GID even after the service is terminated. A local     attacker may use this flaw to access resources that     will be owned by a potentially different service in the     future when the UID/GID will be     recycled.(CVE-2019-3843)

  - In systemd before v242-rc4, it was discovered that     pam_systemd does not properly sanitize the environment     before using the XDG_SEAT variable. It is possible for     an attacker, in some particular configurations, to set     a XDG_SEAT environment variable which allows for     commands to be checked against polkit policies using     the 'allow_active' element rather than     'allow_any'.(CVE-2019-3842)

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.

ID	Name	Product	Family	Severity
180927	Oracle Linux 8 : systemd (ELSA-2020-1794)	Nessus	Oracle Linux Local Security Checks	high
145995	CentOS 8 : systemd (CESA-2020:1794)	Nessus	CentOS Local Security Checks	high
136046	RHEL 8 : systemd (RHSA-2020:1794)	Nessus	Red Hat Local Security Checks	high
133523	Ubuntu 16.04 LTS / 18.04 LTS : systemd vulnerabilities (USN-4269-1)	Nessus	Ubuntu Local Security Checks	high
131484	EulerOS Virtualization for ARM 64 3.0.3.0 : systemd (EulerOS-SA-2019-2319)	Nessus	Huawei Local Security Checks	high
128160	Photon OS 3.0: Systemd PHSA-2019-3.0-0024	Nessus	PhotonOS Local Security Checks	high
126736	SUSE SLED15 / SLES15 Security Update : systemd (SUSE-SU-2019:1364-2)	Nessus	SuSE Local Security Checks	high
126288	EulerOS 2.0 SP8 : systemd (EulerOS-SA-2019-1661)	Nessus	Huawei Local Security Checks	high
125537	SUSE SLED15 / SLES15 Security Update : systemd (SUSE-SU-2019:1364-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2019-3844

high

Tenable Plugins

high

high

high

high

high

high

high

high

high