A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.

A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

The remote NewStart CGSL host, running version MAIN 6.06, has systemd packages installed that are affected by multiple vulnerabilities:

  - A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous     Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this     flaw to crash systemd services or potentially execute code and elevate their privileges, by sending     specially crafted dbus messages. (CVE-2020-1712)

  - systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which     allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory     and a file under that directory, and later replacing that directory with a symlink. This occurs even if     the fs.protected_symlinks sysctl is turned on. (CVE-2018-6954)

  - systemd-resolved through 233 allows remote attackers to cause a denial of service (daemon crash) via a     crafted DNS response with an empty question section. (CVE-2017-9217)

  - In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to     allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a     specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and     subsequently write arbitrary data beyond the end of it. (CVE-2017-9445)

  - A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd     re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly     lead to root privilege escalation. Affected releases are systemd versions up to and including 239.
    (CVE-2018-15686)

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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous     Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this     flaw to crash systemd services or potentially execute code and elevate their privileges, by sending     specially crafted dbus messages. (CVE-2020-1712)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2022:0039 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2020-1712:
    A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous     Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this     flaw to crash systemd services or potentially execute code and elevate their privileges, by sending     specially crafted dbus messages.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

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

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0039 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2019-3842:
    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-2020-13776:
    systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed     by hex digits, as demonstrated by use of root privileges when privileges of the 0x0 user account were     intended. NOTE: this issue exists because of an incomplete fix for CVE-2017-1000082.

    CVE-2020-1712:
    A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous     Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this     flaw to crash systemd services or potentially execute code and elevate their privileges, by sending     specially crafted dbus messages.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

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

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-3063 advisory.

  - A heap use-after-free vulnerability was found in systemd before version v245-rc1, where asynchronous     Polkit queries are performed while handling dbus messages. A local unprivileged attacker can abuse this     flaw to crash systemd services or potentially execute code and elevate their privileges, by sending     specially crafted dbus messages. (CVE-2020-1712)

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-2020:0575 advisory.

  - systemd: use-after-free when asynchronous polkit queries are performed (CVE-2020-1712)

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

An update of the systemd package has been released.

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 :

  - A heap use-after-free vulnerability was found in     systemd, where asynchronous Polkit queries are     performed while handling dbus messages. A local     unprivileged attacker can abuse this flaw to crash     systemd services or potentially execute code and     elevate their privileges, by sending specially crafted     dbus messages.(CVE-2020-1712)

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 :

  - A heap use-after-free vulnerability was found in     systemd, where asynchronous Polkit queries are     performed while handling dbus messages. A local     unprivileged attacker can abuse this flaw to crash     systemd services or potentially execute code and     elevate their privileges, by sending specially crafted     dbus messages.(CVE-2020-1712)

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.

The remote host is affected by the vulnerability described in GLSA-202003-20 (systemd: Heap use-after-free)

    It was found that systemd incorrectly handled certain Polkit queries.
  Impact :

    A local unprivileged user, by sending a specially crafted Polkit query,       could possibly execute arbitrary code with the privileges of the process,       escalate privileges or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2020-0575 advisory.

    - sd-bus: use 'queue' message references for managing r/w message queues in connection objects     (CVE-2020-1712)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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 a vulnerability as referenced in the RHSA-2020:0575 advisory.

    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: use-after-free when asynchronous polkit queries are performed (CVE-2020-1712)

    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.

    Bug Fix(es):

    * systemd: systemctl reload command breaks ordering dependencies between units (BZ#1781712)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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 a vulnerability as referenced in the RHSA-2020:0564 advisory.

    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: use-after-free when asynchronous polkit queries are performed (CVE-2020-1712)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

A few bugfixes and hwdb update.

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.

This update for systemd fixes the following issues :

  - CVE-2020-1712 (bsc#bsc#1162108) Fix a heap     use-after-free vulnerability, when asynchronous Polkit     queries were performed while handling Dbus messages. A     local unprivileged attacker could have abused this flaw     to crash systemd services or potentially execute code     and elevate their privileges, by sending specially     crafted Dbus messages.

  - Use suse.pool.ntp.org server pool on SLE distros     (jsc#SLE-7683)

  - libblkid: open device in nonblock mode. (bsc#1084671)

  - udev/cdrom_id: Do not open CD-rom in exclusive mode.
    (bsc#1154256)

  - bus_open leak sd_event_source when udevadm     trigger&#x3002; (bsc#1161436 CVE-2019-20386)

  - fileio: introduce read_full_virtual_file() for reading     virtual files in sysfs, procfs (bsc#1133495 bsc#1159814)

  - fileio: initialize errno to zero before we do fread()

  - fileio: try to read one byte too much in     read_full_stream()

  - logind: consider 'greeter' sessions suitable as     'display' sessions of a user (bsc#1158485)

  - logind: never elect a session that is stopping as     display

  - journal: include kmsg lines from the systemd process     which exec()d us (#8078)

  - udevd: don't use monitor after manager_exit()

  - udevd: capitalize log messages in on_sigchld()

  - udevd: merge conditions to decrease indentation

  - Revert 'udevd: fix crash when workers time out after     exit is signal caught'

  - core: fragments of masked units ought not be considered     for NeedDaemonReload (#7060) (bsc#1156482)

  - udevd: fix crash when workers time out after exit is     signal caught

  - udevd: wait for workers to finish when exiting     (bsc#1106383)

  - Improve bash completion support (bsc#1155207)

  - shell-completion: systemctl: do not list template units     in (re,)start

  - shell-completion: systemctl: pass current word to all     list_unit*

  - bash-completion: systemctl: pass current partial unit to     list-unit* (bsc#1155207)

  - bash-completion: systemctl: use systemctl --no-pager

  - bash-completion: also suggest template unit files

  - bash-completion: systemctl: add missing options and     verbs

  - bash-completion: use the first argument instead of the     global variable (#6457)

  - networkd: VXLan Make group and remote variable separate     (bsc#1156213)

  - networkd: vxlan require Remote= to be a non multicast     address (#8117) (bsc#1156213)

  - fs-util: let's avoid unnecessary strerror()

  - fs-util: introduce inotify_add_watch_and_warn() helper

  - ask-password: improve log message when inotify limit is     reached (bsc#1155574)

  - shared/install: failing with -ELOOP can be due to the     use of an alias in install_error() (bsc#1151377)

  - man: alias names can't be used with enable command     (bsc#1151377)

  - Add boot option to not use swap at system start     (jsc#SLE-7689)

  - Allow YaST to select Iranian (Persian, Farsi) keyboard     layout (bsc#1092920) This update was imported from the     SUSE:SLE-15:Update update project.

The version of systemd installed on the remote host is prior to 219-57. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2020-1388 advisory.

    A heap use-after-free vulnerability was found in systemd, where asynchronous Polkit queries are performed     while handling dbus messages. A local unprivileged attacker can abuse this flaw to crash systemd services     or potentially execute code and elevate their privileges, by sending specially crafted dbus messages.
    (CVE-2020-1712)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

This update for systemd provides the following fixes :

CVE-2020-1712 (bsc#bsc#1162108) Fix a heap use-after-free vulnerability, when asynchronous Polkit queries were performed while handling Dbus messages. A local unprivileged attacker could have abused this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted Dbus messages.

sd-bus: Deal with cookie overruns. (bsc#1150595)

rules: Add by-id symlinks for persistent memory. (bsc#1140631)

Drop the old fds used for logging and reopen them in the sub process before doing any new logging. (bsc#1154948)

Fix warnings thrown during package installation (bsc#1154043)

Fix for systemctl hanging by restart. (bsc#1139459)

man: mention that alias names are only effective after 'systemctl enable'. (bsc#1151377)

ask-password: improve log message when inotify limit is reached.
(bsc#1155574)

udevd: wait for workers to finish when exiting. (bsc#1106383)

core: fragments of masked units ought not be considered for NeedDaemonReload. (bsc#1156482)

udev: fix 'NULL' deref when executing rules. (bsc#1151506)

Introduce function for reading virtual files in 'sysfs' and 'procfs'.
(bsc#1133495, bsc#1159814)

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.

This update for systemd fixes the following issues :

CVE-2020-1712 (bsc#bsc#1162108) Fix a heap use-after-free vulnerability, when asynchronous Polkit queries were performed while handling Dbus messages. A local unprivileged attacker could have abused this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted Dbus messages.

Use suse.pool.ntp.org server pool on SLE distros (jsc#SLE-7683)

libblkid: open device in nonblock mode. (bsc#1084671)

udev/cdrom_id: Do not open CD-rom in exclusive mode. (bsc#1154256)

bus_open leak sd_event_source when udevadm trigger&Atilde;&pound;&Acirc;&#128;&Acirc;&#130; (bsc#1161436 CVE-2019-20386)

fileio: introduce read_full_virtual_file() for reading virtual files in sysfs, procfs (bsc#1133495 bsc#1159814)

fileio: initialize errno to zero before we do fread()

fileio: try to read one byte too much in read_full_stream()

logind: consider 'greeter' sessions suitable as 'display' sessions of a user (bsc#1158485)

logind: never elect a session that is stopping as display

journal: include kmsg lines from the systemd process which exec()d us (#8078)

udevd: don't use monitor after manager_exit()

udevd: capitalize log messages in on_sigchld()

udevd: merge conditions to decrease indentation

Revert 'udevd: fix crash when workers time out after exit is signal caught'

core: fragments of masked units ought not be considered for NeedDaemonReload (#7060) (bsc#1156482)

udevd: fix crash when workers time out after exit is signal caught

udevd: wait for workers to finish when exiting (bsc#1106383)

Improve bash completion support (bsc#1155207)

  - shell-completion: systemctl: do not list template units     in {re,}start

  - shell-completion: systemctl: pass current word to all     list_unit*

  - bash-completion: systemctl: pass current partial unit to     list-unit* (bsc#1155207)

  - bash-completion: systemctl: use systemctl --no-pager

  - bash-completion: also suggest template unit files

  - bash-completion: systemctl: add missing options and     verbs

  - bash-completion: use the first argument instead of the     global variable (#6457)

networkd: VXLan Make group and remote variable separate (bsc#1156213)

networkd: vxlan require Remote= to be a non multicast address (#8117) (bsc#1156213)

fs-util: let's avoid unnecessary strerror()

fs-util: introduce inotify_add_watch_and_warn() helper

ask-password: improve log message when inotify limit is reached (bsc#1155574)

shared/install: failing with -ELOOP can be due to the use of an alias in install_error() (bsc#1151377)

man: alias names can't be used with enable command (bsc#1151377)

Add boot option to not use swap at system start (jsc#SLE-7689)

Allow YaST to select Iranian (Persian, Farsi) keyboard layout (bsc#1092920)

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.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4269-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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

This update for systemd fixes the following issues :

CVE-2020-1712 (bsc#bsc#1162108) Fix a heap use-after-free vulnerability, when asynchronous Polkit queries were performed while handling Dbus messages. A local unprivileged attacker could have abused this flaw to crash systemd services or potentially execute code and elevate their privileges, by sending specially crafted Dbus messages.

Unconfirmed fix for prevent hanging of systemctl during restart.
(bsc#1139459)

Fix warnings thrown during package installation. (bsc#1154043)

Fix for system-udevd prevent crash within OES2018. (bsc#1151506)

Fragments of masked units ought not be considered for 'NeedDaemonReload'. (bsc#1156482)

Wait for workers to finish when exiting. (bsc#1106383)

Improve log message when inotify limit is reached. (bsc#1155574)

Mention in the man pages that alias names are only effective after command 'systemctl enable'. (bsc#1151377)

Introduce function for reading virtual files in 'sysfs' and 'procfs'.
(bsc#1133495, bsc#1159814)

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.

ID	Name	Product	Family	Severity
504091	Siemens SIMATIC S7-1500 Use After Free (CVE-2020-1712)	Tenable OT Security	Tenable.ot	high
266232	NewStart CGSL MAIN 6.06 : systemd Multiple Vulnerabilities (NS-SA-2025-0220)	Nessus	NewStart CGSL Local Security Checks	high
252149	Linux Distros Unpatched Vulnerability : CVE-2020-1712	Nessus	Misc.	high
238612	TencentOS Server 3: systemd (TSSA-2022:0039)	Nessus	Tencent Local Security Checks	high
236564	Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)	Nessus	Alibaba Cloud Linux Local Security Checks	high
162623	Debian DLA-3063-1 : systemd - LTS security update	Nessus	Debian Local Security Checks	high
145852	CentOS 8 : systemd (CESA-2020:0575)	Nessus	CentOS Local Security Checks	high
137642	Photon OS 1.0: Systemd PHSA-2020-1.0-0301	Nessus	PhotonOS Local Security Checks	high
136335	Photon OS 2.0: Systemd PHSA-2020-2.0-0235	Nessus	PhotonOS Local Security Checks	high
136097	Photon OS 3.0: Systemd PHSA-2020-3.0-0083	Nessus	PhotonOS Local Security Checks	high
135118	EulerOS Virtualization for ARM 64 3.0.6.0 : systemd (EulerOS-SA-2020-1331)	Nessus	Huawei Local Security Checks	high
134793	EulerOS 2.0 SP8 : systemd (EulerOS-SA-2020-1301)	Nessus	Huawei Local Security Checks	high
134597	GLSA-202003-20 : systemd: Heap use-after-free	Nessus	Gentoo Local Security Checks	high
134058	Oracle Linux 8 : systemd (ELSA-2020-0575)	Nessus	Oracle Linux Local Security Checks	high
134030	RHEL 8 : systemd (RHSA-2020:0575)	Nessus	Red Hat Local Security Checks	high
133942	RHEL 8 : systemd (RHSA-2020:0564)	Nessus	Red Hat Local Security Checks	high
133893	Fedora 30 : systemd (2020-f8e267d6d0)	Nessus	Fedora Local Security Checks	high
133666	openSUSE Security Update : systemd (openSUSE-2020-208)	Nessus	SuSE Local Security Checks	high
133552	Amazon Linux 2 : systemd (ALAS-2020-1388)	Nessus	Amazon Linux Local Security Checks	high
133547	SUSE SLES12 Security Update : systemd (SUSE-SU-2020:0353-1)	Nessus	SuSE Local Security Checks	high
133540	SUSE SLED15 / SLES15 Security Update : systemd (SUSE-SU-2020:0335-1)	Nessus	SuSE Local Security Checks	high
133523	Ubuntu 16.04 LTS / 18.04 LTS : systemd vulnerabilities (USN-4269-1)	Nessus	Ubuntu Local Security Checks	high
133520	SUSE SLED12 / SLES12 Security Update : systemd (SUSE-SU-2020:0331-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2020-1712

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

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high

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