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.

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

  - 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-2020-13776)

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

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1611 advisory.

  - 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)

  - 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-2020-13776)

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

The version of systemd installed on the remote host is prior to 219-78. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2022-1854 advisory.

    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)

    An exploitable denial of service vulnerability exists in systemd which does not fully implement RFC3203,     as it does not support authentication of FORCERENEW packets. A specially crafted DHCP FORCERENEW packet     can cause a system, running the DHCP client, to be vulnerable to a DHCP ACK spoofing attack. An attacker     can forge a pair of FORCERENEW and DCHPACK packets to reconfigure the system with arbitrary network     settings. (CVE-2020-13529)

    A flaw was found in systemd, where it mishandles numerical usernames beginning with decimal digits, or     0x followed by hexadecimal digits. When the usernames are used by systemd, for example in service units,     an unexpected user may be used instead. In some particular configurations, this flaw allows local     attackers to elevate their privileges. (CVE-2020-13776)

    A use-after-free vulnerability was found in systemd. This issue occurs due to the on_stream_io() function     and dns_stream_complete() function in resolved-dns-stream.c not incrementing the reference counting for     theDnsStream object. Therefore, other functions and callbacks called can dereference the DNSStream object,     causing the use-after-free when the reference is still used later. (CVE-2022-2526)

Tenable has extracted the preceding description block directly from the tested product 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 NewStart CGSL host, running version MAIN 6.02, has systemd packages installed that are affected by multiple vulnerabilities:

  - An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the     udevadm trigger command, a memory leak may occur. (CVE-2019-20386)

  - 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)

  - 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-2020-13776)

  - basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an     Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that     results in an operating system crash. (CVE-2021-33910)

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

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2021:1611 advisory.

  - 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)

  - 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-2020-13776)

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-2021:3900 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: Spoofing of XDG_SEAT allows for actions to be checked against allow_active instead of     allow_any (CVE-2019-3842)

    * systemd: Mishandles numerical usernames beginning with decimal digits or 0x followed by hexadecimal     digits (CVE-2020-13776)

    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 these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-1611 advisory.

    [239-45.0.1]
    - backport upstream pstore tmpfiles patch [Orabug: 31420486]
    - udev rules: fix memory hot add and remove [Orabug: 31310273]
    - fix to enable systemd-pstore.service [Orabug: 30951066]
    - journal: change support URL shown in the catalog entries [Orabug: 30853009]
    - fix to generate systemd-pstore.service file [Orabug: 30230056]
    - fix _netdev is missing for iscsi entry in /etc/fstab (tony.l.lam@oracle.com) [Orabug: 25897792]
    - set 'RemoveIPC=no' in logind.conf as default for OL7.2 [Orabug: 22224874]
    - allow dm remove ioctl to co-operate with UEK3 (Vaughan Cao) [Orabug: 18467469]
    - add hv dynamic memory support (Jerry Snitselaar) [Orabug: 18621475]
    - Backport upstream patches for the new systemd-pstore tool (Eric DeVolder) [OraBug: 30230056]

    [239-45]
    - Revert 'test: add test cases for empty string match' and 'test: add test case for multi matches when use     ||' (#1931947)
    - test/sys-script.py: add missing DEVNAME entries to uevents (#1931947)
    - sd-event: split out helper functions for reshuffling prioqs (#1819868)
    - sd-event: split out enable and disable codepaths from sd_event_source_set_enabled() (#1819868)
    - sd-event: mention that two debug logged events are ignored (#1819868)
    - sd-event: split clock data allocation out of sd_event_add_time() (#1819868)
    - sd-event: split out code to add/remove timer event sources to earliest/latest prioq (#1819868)
    - sd-event: fix delays assert brain-o (#17790) (#1819868)
    - sd-event: lets suffix last_run/last_log with '_usec' (#1819868)
    - sd-event: refuse running default event loops in any other thread than the one they are default for     (#1819868)
    - sd-event: ref event loop while in sd_event_prepare() ot sd_event_run() (#1819868)
    - sd-event: follow coding style with naming return parameter (#1819868)
    - sd-event: remove earliest_index/latest_index into common part of event source objects (#1819868)
    - sd-event: update state at the end in event_source_enable (#1819868)
    - sd-event: increase n_enabled_child_sources just once (#1819868)
    - sd-event: add ability to ratelimit event sources (#1819868)
    - test: add ratelimiting test (#1819868)
    - core: prevent excessive /proc/self/mountinfo parsing (#1819868)
    - udev: run link_update() with increased retry count in second invocation (#1931947)
    - pam-systemd: use secure_getenv() rather than getenv() (#1687514)

    [239-44]
    - ci: PowerTools repo was renamed to powertools in RHEL 8.3 (#1871827)
    - ci: use quay.io instead of Docker Hub to avoid rate limits (#1871827)
    - ci: move jobs from Travis CI to GH Actions (#1871827)
    - unit: make UNIT() cast function deal with NULL pointers (#1871827)
    - use link to RHEL-8 docs (#1623116)
    - cgroup: Also set blkio.bfq.weight (#1657810)
    - units: make sure initrd-cleanup.service terminates before switching to rootfs (#1657810)
    - core: reload SELinux label cache on daemon-reload (#1888912)
    - selinux: introduce mac_selinux_create_file_prepare_at() (#1888912)
    - selinux: add trigger for policy reload to refresh internal selabel cache (#1888912)
    - udev/net_id: give RHEL-8.4 naming scheme a name (#1827462)
    - basic/stat-util: make mtime check stricter and use entire timestamp (#1642728)
    - udev: make algorithm that selects highest priority devlink less susceptible to race conditions     (#1642728)
    - test: create /dev/null in test-udev.pl (#1642728)
    - test: missing 'die' (#1642728)
    - udev-test: remove a check for whether the test is run in a container (#1642728)
    - udev-test: skip the test only if it cant setup its environment (#1642728)
    - udev-test: fix test skip condition (#1642728)
    - udev-test: fix missing directory test/run (#1642728)
    - udev-test: check if permitted to create block device nodes (#1642728)
    - test-udev: add a testcase of too long line (#1642728)
    - test-udev: use proper semantics for too long line with continuation (#1642728)
    - test-udev: add more tests for line continuations and comments (#1642728)
    - test-udev: add more tests for line continuation (#1642728)
    - test-udev: fix alignment and drop unnecessary white spaces (#1642728)
    - test/udev-test.pl: cleanup if skipping test (#1642728)
    - test: add test cases for empty string match (#1642728)
    - test: add test case for multi matches when use '||' (#1642728)
    - udev-test: do not rely on 'mail' group being defined (#1642728)
    - test/udev-test.pl: allow multiple devices per test (#1642728)
    - test/udev-test.pl: create rules only once (#1642728)
    - test/udev-test.pl: allow concurrent additions and removals (#1642728)
    - test/udev-test.pl: use computed devnode name (#1642728)
    - test/udev-test.pl: test correctness of symlink targets (#1642728)
    - test/udev-test.pl: allow checking multiple symlinks (#1642728)
    - test/udev-test.pl: fix wrong test descriptions (#1642728)
    - test/udev-test.pl: last_rule is unsupported (#1642728)
    - test/udev-test.pl: Make some tests a little harder (#1642728)
    - test/udev-test.pl: remove bogus rules from magic subsys test (#1642728)
    - test/udev-test.pl: merge 'space and var with space' tests (#1642728)
    - test/udev-test.pl: merge import parent tests into one (#1642728)
    - test/udev-test.pl: count 'good' results (#1642728)
    - tests/udev-test.pl: add multiple device test (#1642728)
    - test/udev-test.pl: add repeat count (#1642728)
    - test/udev-test.pl: generator for large list of block devices (#1642728)
    - test/udev-test.pl: suppress umount error message at startup (#1642728)
    - test/udev_test.pl: add 'expected good' count (#1642728)
    - test/udev-test: gracefully exit when imports fail (#1642728)

    [239-43]
    - man: mention System Administrators Guide in systemctl manpage (#1623116)
    - udev: introduce udev net_id 'naming schemes' (#1827462)
    - meson: make net.naming-scheme= default configurable (#1827462)
    - man: describe naming schemes in a new man page (#1827462)
    - udev/net_id: parse _SUN ACPI index as a signed integer (#1827462)
    - udev/net_id: dont generate slot based names if multiple devices might claim the same slot (#1827462)
    - fix typo in ProtectSystem= option (#1871139)
    - remove references of non-existent man pages (#1876807)
    - log: Prefer logging to CLI unless JOURNAL_STREAM is set (#1865840)
    - locale-util: add new helper locale_is_installed() (#1755287)
    - test: add test case for locale_is_installed() (#1755287)
    - tree-wide: port various bits over to locale_is_installed() (#1755287)
    - install: allow instantiated units to be enabled via presets (#1812972)
    - install: small refactor to combine two function calls into one function (#1812972)
    - test: fix a memleak (#1812972)
    - docs: Add syntax for templated units to systemd.preset man page (#1812972)
    - shared/install: fix preset operations for non-service instantiated units (#1812972)
    - introduce setsockopt_int() helper (#1887181)
    - socket-util: add generic socket_pass_pktinfo() helper (#1887181)
    - core: add new PassPacketInfo= socket unit property (#1887181)
    - resolved: tweak cmsg calculation (#1887181)

    [239-42]
    - logind: dont print warning when user@.service template is masked (#1880270)
    - build: use simple project version in pkgconfig files (#1862714)
    - basic/virt: try the /proc/1/sched hack also for PID1 (#1868877)
    - seccomp: rework how the S[UG]ID filter is installed (#1860374)
    - vconsole-setup: downgrade log message when setting font fails on dummy console (#1889996)
    - units: fix systemd.special man page reference in system-update-cleanup.service (#1871827)
    - units: drop reference to sushell man page (#1871827)
    - sd-bus: break the loop in bus_ensure_running() if the bus is not connecting (#1885553)
    - core: add new API for enqueing a job with returning the transaction data (#846319)
    - systemctl: replace switch statement by table of structures (#846319)
    - systemctl: reindent table (#846319)
    - systemctl: Only wait when theres something to wait for. (#846319)
    - systemctl: clean up start_unit_one() error handling (#846319)
    - systemctl: split out extra args generation into helper function of its own (#846319)
    - systemctl: add new --show-transaction switch (#846319)
    - test: add some basic testing that 'systemctl start -T' does something (#846319)
    - man: document the new systemctl --show-transaction option (#846319)
    - socket: New option 'FlushPending' (boolean) to flush socket before entering listening state (#1870638)
    - core: remove support for API bus 'started outside our own logic' (#1764282)
    - mount-setup: fix segfault in mount_cgroup_controllers when using gcc9 compiler (#1868877)
    - dbus-execute: make transfer of CPUAffinity endian safe (#12711) (#1740657)
    - core: add support for setting CPUAffinity= to special 'numa' value (#1740657)
    - basic/user-util: always use base 10 for user/group numbers (#1848373)
    - parse-util: sometimes it is useful to check if a string is a valid integer, but not actually parse it     (#1848373)
    - basic/parse-util: add safe_atoux64() (#1848373)
    - parse-util: allow tweaking how to parse integers (#1848373)
    - parse-util: allow '-0' as alternative to '0' and '+0' (#1848373)
    - parse-util: make return parameter optional in safe_atou16_full() (#1848373)
    - parse-util: rewrite parse_mode() on top of safe_atou_full() (#1848373)
    - user-util: be stricter in parse_uid() (#1848373)
    - strv: add new macro STARTSWITH_SET() (#1848373)
    - parse-util: also parse integers prefixed with 0b and 0o (#1848373)
    - tests: beef up integer parsing tests (#1848373)
    - shared/user-util: add compat forms of user name checking functions (#1848373)
    - shared/user-util: emit a warning on names with dots (#1848373)
    - user-util: Allow names starting with a digit (#1848373)
    - shared/user-util: allow usernames with dots in specific fields (#1848373)
    - user-util: switch order of checks in valid_user_group_name_or_id_full() (#1848373)
    - user-util: rework how we validate user names (#1848373)

Tenable has extracted the preceding description block directly from the Oracle 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 CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1611 advisory.

  - systemd: Spoofing of XDG_SEAT allows for actions to be checked against allow_active instead of     allow_any (CVE-2019-3842)

  - systemd: Mishandles numerical usernames beginning with decimal digits or 0x followed by hexadecimal digits     (CVE-2020-13776)

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-2021:1611 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: Spoofing of XDG_SEAT allows for actions to be checked against allow_active instead of     allow_any (CVE-2019-3842)

    * systemd: Mishandles numerical usernames beginning with decimal digits or 0x followed by hexadecimal     digits (CVE-2020-13776)

    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 8.4 Release Notes     linked from 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 these issues 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 installation on the remote host is affected by the following vulnerability :

  - A flaw was found in systemd, where it mishandles     numerical usernames beginning with decimal digits, or     '0x' followed by hexadecimal digits. When the usernames     are used by systemd, for example in service units, an     unexpected user may be used instead. In some particular     configurations, this flaw allows local attackers to     elevate their privileges.(CVE-2020-13776)

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 Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - 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-2020-13776)

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 :

  - 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-2020-13776)

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.

Contains a bunch of patches for the assorted linked bugzillas.
Handling of user names that resemble numerical uids is tightened (CVE-2020-13776). The hardware database is updated to the upstream version.

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.

An update of the systemd package has been released.

ID	Name	Product	Family	Severity
236564	Alibaba Cloud Linux 3 : 0039: systemd (ALINUX3-SA-2022:0039)	Nessus	Alibaba Cloud Linux Local Security Checks	high
223210	Linux Distros Unpatched Vulnerability : CVE-2020-13776	Nessus	Misc.	medium
184771	Rocky Linux 8 : systemd (RLSA-2021:1611)	Nessus	Rocky Linux Local Security Checks	high
165993	Amazon Linux 2 : systemd (ALAS-2022-1854)	Nessus	Amazon Linux Local Security Checks	critical
160827	NewStart CGSL MAIN 6.02 : systemd Multiple Vulnerabilities (NS-SA-2022-0055)	Nessus	NewStart CGSL Local Security Checks	high
157711	AlmaLinux 8 : systemd (ALSA-2021:1611)	Nessus	Alma Linux Local Security Checks	high
154260	RHEL 8 : systemd (RHSA-2021:3900)	Nessus	Red Hat Local Security Checks	high
149954	Oracle Linux 8 : systemd (ELSA-2021-1611)	Nessus	Oracle Linux Local Security Checks	high
149774	CentOS 8 : systemd (CESA-2021:1611)	Nessus	CentOS Local Security Checks	high
149692	RHEL 8 : systemd (RHSA-2021:1611)	Nessus	Red Hat Local Security Checks	high
148605	EulerOS Virtualization 2.9.1 : systemd (EulerOS-SA-2021-1724)	Nessus	Huawei Local Security Checks	medium
148595	EulerOS Virtualization 2.9.0 : systemd (EulerOS-SA-2021-1738)	Nessus	Huawei Local Security Checks	medium
147069	EulerOS Virtualization for ARM 64 3.0.6.0 : systemd (EulerOS-SA-2021-1534)	Nessus	Huawei Local Security Checks	medium
146257	EulerOS 2.0 SP9 : systemd (EulerOS-SA-2021-1277)	Nessus	Huawei Local Security Checks	medium
146219	EulerOS 2.0 SP9 : systemd (EulerOS-SA-2021-1258)	Nessus	Huawei Local Security Checks	medium
145717	EulerOS 2.0 SP8 : systemd (EulerOS-SA-2021-1174)	Nessus	Huawei Local Security Checks	medium
139212	Fedora 32 : systemd (2020-2faf839786)	Nessus	Fedora Local Security Checks	medium
137725	Photon OS 3.0: Systemd PHSA-2020-3.0-0103	Nessus	PhotonOS Local Security Checks	medium
137642	Photon OS 1.0: Systemd PHSA-2020-1.0-0301	Nessus	PhotonOS Local Security Checks	high
137303	Photon OS 2.0: Systemd PHSA-2020-2.0-0252	Nessus	PhotonOS Local Security Checks	medium

Detections

Analytics

CVE-2020-13776

medium

Tenable Plugins

high

medium

high

critical

high

high

high

high

high

high

medium

medium

medium

medium

medium

medium

medium

medium

high

medium