CVE-2018-16865

An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when many entries are sent to the journal socket. A local attacker, or a remote one if systemd-journal-remote is used, may use this flaw to crash systemd-journald or execute code with journald privileges. Versions through v240 are vulnerable.

This update for systemd provides the following fixes:

Security issues fixed:

• CVE-2018-16864, CVE-2018-16865: Fixed two memory corruptions through attacker-controlled alloca()s (bsc#1120323)
• CVE-2018-16866: Fixed an information leak in journald (bsc#1120323)
• CVE-2018-6954: Fix mishandling of symlinks present in non-terminal path components (bsc#1080919)
• Fixed an issue during system startup in relation to encrypted swap disks (bsc#1119971)

Non-security issues fixed:

• pam_systemd: Fix 'Cannot create session: Already running in a session' (bsc#1111498)
• systemd-vconsole-setup: vconsole setup fails, fonts will not be copied to tty (bsc#1114933)
• systemd-tmpfiles-setup: symlinked /tmp to /var/tmp breaking multiple units (bsc#1045723)
• Fixed installation issue with /etc/machine-id during update (bsc#1117063)
• btrfs: qgroups are assigned to parent qgroups after reboot (bsc#1093753)
• logind: Stop managing VT switches if no sessions are registered on that VT. (bsc#1101591)
• udev: Downgrade message when settting inotify watch up fails. (bsc#1005023)
• udev: Ignore the exit code of systemd-detect-virt for memory hot-add. In SLE-12-SP3, 80-hotplug-cpu-mem.rules has a memory hot-add rule that uses systemd-detect-virt to detect non-zvm environment. The systemd-detect-virt returns exit failure code when it detected none state. The exit failure code causes that the hot-add memory block can not be set to online. (bsc#1076696)

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:

• Fix security vulnerabilities CVE-2018-16864 and CVE-2018-16865 (bsc#1120323): Both issues were memory corruptions via attacker-controlled alloca which could have been used to gain root privileges by a local attacker.

• Fix security vulnerability CVE-2018-15686 (bsc#1113665): A vulnerability in unit_deserialize of systemd used to allow an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This could have been used to improperly influence systemd execution and possibly lead to root privilege escalation.

• Remedy 2048 character line-length limit in systemd-sysctl code that would cause parser failures if /etc/sysctl.conf contained lines that exceeded this length (bsc#1071558).

• Fix a bug in systemd's core timer code that would cause timer looping under certain conditions, resulting in hundreds of syslog messages being written to the journal (bsc#1068588).

This update for systemd fixes the following issues:

• Fix security vulnerabilities CVE-2018-16864 and CVE-2018-16865 (bsc#1120323): Both issues were memory corruptions via attacker-controlled alloca which could have been used to gain root privileges by a local attacker.

• Fix security vulnerability CVE-2018-15686 (bsc#1113665): A vulnerability in unit_deserialize of systemd used to allow an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This could have been used to improperly influence systemd execution and possibly lead to root privilege escalation.

• Remedy 2048 character line-length limit in systemd-sysctl code that would cause parser failures if /etc/sysctl.conf contained lines that exceeded this length (bsc#1071558).

• Fix a bug in systemd's core timer code that would cause timer looping under certain conditions, resulting in hundreds of syslog messages being written to the journal (bsc#1068588).

This update for systemd fixes the following issues:

• Fix security vulnerabilities CVE-2018-16864 and CVE-2018-16865 (bsc#1120323): Both issues were memory corruptions via attacker-controlled alloca which could have been used to gain root privileges by a local attacker.

• Fix security vulnerability CVE-2018-15686 (bsc#1113665): A vulnerability in unit_deserialize of systemd used to allow an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This could have been used to improperly influence systemd execution and possibly lead to root privilege escalation.

• Remedy 2048 character line-length limit in systemd-sysctl code that would cause parser failures if /etc/sysctl.conf contained lines that exceeded this length (bsc#1071558).

• Fix a bug in systemd's core timer code that would cause timer looping under certain conditions, resulting in hundreds of syslog messages being written to the journal (bsc#1068588).

This update for systemd provides the following fixes:

Security issues fixed:

• CVE-2018-16864, CVE-2018-16865: Fixed two memory corruptions through attacker-controlled alloca()s (bsc#1120323)
• CVE-2018-16866: Fixed an information leak in journald (bsc#1120323)
• Fixed an issue during system startup in relation to encrypted swap disks (bsc#1119971)

Non-security issues fixed:

• core: Queue loading transient units after setting their properties. (bsc#1115518)
• logind: Stop managing VT switches if no sessions are registered on that VT. (bsc#1101591)
• terminal-util: introduce vt_release() and vt_restore() helpers.
• terminal: Unify code for resetting kbd utf8 mode a bit.
• terminal Reset should honour default_utf8 kernel setting.
• logind: Make session_restore_vt() static.
• udev: Downgrade message when settting inotify watch up fails. (bsc#1005023)
• log: Never log into foreign fd #2 in PID 1 or its pre-execve() children. (bsc#1114981)
• udev: Ignore the exit code of systemd-detect-virt for memory hot-add. In SLE-12-SP3, 80-hotplug-cpu-mem.rules has a memory hot-add rule that uses systemd-detect-virt to detect non-zvm environment. The systemd-detect-virt returns exit failure code when it detected none state. The exit failure code causes that the hot-add memory block can not be set to online. (bsc#1076696)

This update for systemd provides the following fixes:

Security issues fixed:

• CVE-2018-16864, CVE-2018-16865: Fixed two memory corruptions through attacker-controlled alloca()s (bsc#1120323)
• CVE-2018-16866: Fixed an information leak in journald (bsc#1120323)
• CVE-2018-6954: Fix mishandling of symlinks present in non-terminal path components (bsc#1080919)
• Fixed an issue during system startup in relation to encrypted swap disks (bsc#1119971)

Non-security issues fixed:

• pam_systemd: Fix 'Cannot create session: Already running in a session' (bsc#1111498)
• systemd-vconsole-setup: vconsole setup fails, fonts will not be copied to tty (bsc#1114933)
• systemd-tmpfiles-setup: symlinked /tmp to /var/tmp breaking multiple units (bsc#1045723)
• Fixed installation issue with /etc/machine-id during update (bsc#1117063)
• btrfs: qgroups are assigned to parent qgroups after reboot (bsc#1093753)
• logind: Stop managing VT switches if no sessions are registered on that VT. (bsc#1101591)
• udev: Downgrade message when settting inotify watch up fails. (bsc#1005023)
• udev: Ignore the exit code of systemd-detect-virt for memory hot-add. In SLE-12-SP3, 80-hotplug-cpu-mem.rules has a memory hot-add rule that uses systemd-detect-virt to detect non-zvm environment. The systemd-detect-virt returns exit failure code when it detected none state. The exit failure code causes that the hot-add memory block can not be set to online. (bsc#1076696)

It was discovered that systemd-journald allocated variable-length buffers for certain message fields on the stack. A local attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2018-16864)

It was discovered that systemd-journald allocated variable-length arrays of objects representing message fields on the stack. A local attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2018-16865)

An out-of-bounds read was discovered in systemd-journald. A local attacker could potentially exploit this to obtain sensitive information and bypass ASLR protections. (CVE-2018-16866)