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SUSE-SU-2023:0846-1

Опубликовано: 21 мар. 2023
Источник: suse-cvrf

Описание

Security update for xen

This update for xen fixes the following issues:

  • CVE-2022-42332: Fixed use-after-free in x86 shadow plus log-dirty mode (bsc#1209017).
  • CVE-2022-42331: Fixed speculative vulnerability in 32bit SYSCALL path on x86 (bsc#1209019).

Список пакетов

SUSE Linux Enterprise Server 12 SP2-BCL
xen-4.7.6_32-43.104.1
xen-doc-html-4.7.6_32-43.104.1
xen-libs-4.7.6_32-43.104.1
xen-libs-32bit-4.7.6_32-43.104.1
xen-tools-4.7.6_32-43.104.1
xen-tools-domU-4.7.6_32-43.104.1

Ссылки

Описание

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work (XSA-254), one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variety of speculative attacks.

Затронутые продукты
SUSE Linux Enterprise Server 12 SP2-BCL:xen-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-doc-html-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-libs-32bit-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-libs-4.7.6_32-43.104.1
Ссылки

Описание

x86 shadow plus log-dirty mode use-after-free In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Shadow mode maintains a pool of memory used for both shadow page tables as well as auxiliary data structures. To migrate or snapshot guests, Xen additionally runs them in so called log-dirty mode. The data structures needed by the log-dirty tracking are part of aformentioned auxiliary data. In order to keep error handling efforts within reasonable bounds, for operations which may require memory allocations shadow mode logic ensures up front that enough memory is available for the worst case requirements. Unfortunately, while page table memory is properly accounted for on the code path requiring the potential establishing of new shadows, demands by the log-dirty infrastructure were not taken into consideration. As a result, just established shadow page tables could be freed again immediately, while other code is still accessing them on the assumption that they would remain allocated.

Затронутые продукты
SUSE Linux Enterprise Server 12 SP2-BCL:xen-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-doc-html-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-libs-32bit-4.7.6_32-43.104.1
SUSE Linux Enterprise Server 12 SP2-BCL:xen-libs-4.7.6_32-43.104.1
Ссылки