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SUSE-SU-2017:3284-1

Опубликовано: 14 дек. 2017
Источник: suse-cvrf

Описание

Security update for the Linux Kernel (Live Patch 11 for SLE 12 SP2)

This update for the Linux Kernel 4.4.74-92_32 fixes several issues.

The following security issues were fixed:

  • CVE-2017-1000405: Problematic use of pmd_mkdirty() in the touch_pmd() function allowed users to overwrite read-only huge pages (e.g. the zero huge page and sealed shmem files) (bsc#1070307).
  • CVE-2017-16939: The XFRM dump policy implementation in net/xfrm/xfrm_user.c kernel allowed local users to gain privileges or cause a denial of service (use-after-free) via a crafted SO_RCVBUF setsockopt system call in conjunction with XFRM_MSG_GETPOLICY Netlink messages (bsc#1069708).

This non-security issue was fixed:

  • bsc#1062847: Enable proper shut down if NIC teaming is enabled

Список пакетов

SUSE Linux Enterprise Live Patching 12
kgraft-patch-4_4_74-92_32-default-5-2.1

Ссылки

Описание

The Linux Kernel versions 2.6.38 through 4.14 have a problematic use of pmd_mkdirty() in the touch_pmd() function inside the THP implementation. touch_pmd() can be reached by get_user_pages(). In such case, the pmd will become dirty. This scenario breaks the new can_follow_write_pmd()'s logic - pmd can become dirty without going through a COW cycle. This bug is not as severe as the original "Dirty cow" because an ext4 file (or any other regular file) cannot be mapped using THP. Nevertheless, it does allow us to overwrite read-only huge pages. For example, the zero huge page and sealed shmem files can be overwritten (since their mapping can be populated using THP). Note that after the first write page-fault to the zero page, it will be replaced with a new fresh (and zeroed) thp.

Затронутые продукты
SUSE Linux Enterprise Live Patching 12:kgraft-patch-4_4_74-92_32-default-5-2.1
Ссылки

Описание

The XFRM dump policy implementation in net/xfrm/xfrm_user.c in the Linux kernel before 4.13.11 allows local users to gain privileges or cause a denial of service (use-after-free) via a crafted SO_RCVBUF setsockopt system call in conjunction with XFRM_MSG_GETPOLICY Netlink messages.

Затронутые продукты
SUSE Linux Enterprise Live Patching 12:kgraft-patch-4_4_74-92_32-default-5-2.1
Ссылки