CVE-2018-1049

In systemd prior to 234 a race condition exists between .mount and .automount units such that automount requests from kernel may not be serviced by systemd resulting in kernel holding the mountpoint and any processes that try to use said mount will hang. A race condition like this may lead to denial of service, until mount points are unmounted.

In systemd prior to 234 a race exists between .mount and .automount units such that automount requests from kernel may not be serviced by systemd resulting in kernel holding the mountpoint and any processes that try to use said mount will hang. A race like this may lead to denial of service, until mount points are unmounted (CVE-2018-1049).

This update for systemd fixes several issues.

This security issue was fixed:

• CVE-2018-1049: Prevent race that can lead to DoS when using automounts (bsc#1076308).

These non-security issues were fixed:

• core: don't choke if a unit another unit triggers vanishes during reload
• delta: don't ignore PREFIX when the given argument is PREFIX/SUFFIX
• delta: extend skip logic to work on full directory paths (prefix+suffix) (bsc#1070428)
• delta: check if a prefix needs to be skipped only once
• delta: skip symlink paths when split-usr is enabled (#4591)
• sysctl: use raw file descriptor in sysctl_write (#7753)
• sd-netlink: don't take possesion of netlink fd from caller on failure (bsc#1074254)
• Fix the regexp used to detect broken by-id symlinks in /etc/crypttab It was missing the following case: '/dev/disk/by-id/cr_-xxx'.
• sysctl: disable buffer while writing to /proc (bsc#1071558)
• Use read_line() and LONG_LINE_MAX to read values configuration files. (bsc#1071558)
• sysctl: no need to check for eof twice
• def: add new constant LONG_LINE_MAX
• fileio: add new helper call read_line() as bounded getline() replacement
• service: Don't stop unneeded units needed by restarted service (#7526) (bsc#1066156)
• gpt-auto-generator: fix the handling of the value returned by fstab_has_fstype() in add_swap() (#6280)
• gpt-auto-generator: disable gpt auto logic for swaps if at least one is defined in fstab (bsc#897422)
• fstab-util: introduce fstab_has_fstype() helper
• fstab-generator: ignore root=/dev/nfs (#3591)
• fstab-generator: don't process root= if it happens to be 'gpt-auto' (#3452)
• virt: use XENFEAT_dom0 to detect the hardware domain (#6442, #6662) (#7581) (bsc#1048510)
• analyze: replace --no-man with --man=no in the man page (bsc#1068251)
• udev: net_setup_link: don't error out when we couldn't apply link config (#7328)
• Add missing /etc/systemd/network directory
• Fix parsing of features in detect_vm_xen_dom0 (#7890) (bsc#1048510)
• sd-bus: use -- when passing arguments to ssh (#6706)
• systemctl: make sure we terminate the bus connection first, and then close the pager (#3550)
• sd-bus: bump message queue size (bsc#1075724)
• tmpfiles: downgrade warning about duplicate line

Karim Hossen & Thomas Imbert and Nelson William Gamazo Sanchez independently discovered that systemd-resolved incorrectly handled certain DNS responses. A remote attacker could possibly use this issue to cause systemd to temporarily stop responding, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-15908)

It was discovered that systemd incorrectly handled automounted volumes. A local attacker could possibly use this issue to cause applications to hang, resulting in a denial of service. (CVE-2018-1049)