CVE-2019-20386

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.

Updated systemd packages fix security vulnerabilities:

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).

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).

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。 (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.

These are all security issues fixed in the libsystemd0-249.4-2.2 package on the GA media of openSUSE Tumbleweed.

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。 (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 for systemd fixes the following issues:

• CVE-2019-20386: Fixed a memory leak when executing the udevadm trigger command (bsc#1161436).
• Renamed the persistent link for ATA devices (bsc#1164538)
• shared/install: try harder to find enablement symlinks when disabling a unit (bsc#1157315)
• tmpfiles: removed unnecessary assert (bsc#1171145)
• pid1: by default make user units inherit their umask from the user manager (bsc#1162698)
• manager: fixed job mode when signalled to shutdown etc (bsc#1161262)
• coredump: fixed bug that loses core dump files when core dumps are compressed and disk space is low. (bsc#1167622)
• udev: inform systemd how many workers we can potentially spawn (#4036) (bsc#1165633)
• libblkid: open device in nonblock mode. (bsc#1084671)
• udev/cdrom_id: Do not open CD-rom in exclusive mode. (bsc#1154256)

This update for systemd fixes the following issues:

• CVE-2019-20386: Fixed a memory leak when executing the udevadm trigger command (bsc#1161436).
• Renamed the persistent link for ATA devices (bsc#1164538)
• shared/install: try harder to find enablement symlinks when disabling a unit (bsc#1157315)
• tmpfiles: removed unnecessary assert (bsc#1171145)
• pid1: by default make user units inherit their umask from the user manager (bsc#1162698)
• manager: fixed job mode when signalled to shutdown etc (bsc#1161262)
• coredump: fixed bug that loses core dump files when core dumps are compressed and disk space is low. (bsc#1167622)
• udev: inform systemd how many workers we can potentially spawn (#4036) (bsc#1165633)
• libblkid: open device in nonblock mode. (bsc#1084671)
• udev/cdrom_id: Do not open CD-rom in exclusive mode. (bsc#1154256)

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)