ALT-PU-2018-1867-2

BDU:2020-00048

HIGH7.8

Уязвимость ядра операционных систем Linux, Windows, Ubuntu, Debian GNU/Linux, Red Hat Enterprise Linux, macOS, EulerOS, позволяющая нарушителю повысить свои привилегии

Опубликовано: 2020-01-13Изменено: 2021-08-19

CVSS 3.xВЫСОКАЯ 7.8

CVSS:3.x/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0СРЕДНЯЯ 6.8

CVSS:2.0/AV:L/AC:L/Au:S/C:C/I:C/A:C

Ссылки

CVE-2018-12893

MEDIUM6.5

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.

Опубликовано: 2018-07-02Изменено: 2024-11-21

CVSS 2.0НИЗКАЯ 2.1

CVSS:2.0/AV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS 3.xСРЕДНЯЯ 6.5

CVSS:3.x/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Ссылки

CVE-2018-7540

MEDIUM6.5

An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.

Опубликовано: 2018-02-27Изменено: 2024-11-21

CVSS 2.0СРЕДНЯЯ 4.9

CVSS:2.0/AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS 3.xСРЕДНЯЯ 6.5

CVSS:3.x/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Ссылки

CVE-2018-7541

HIGH8.8

An issue was discovered in Xen through 4.10.x allowing guest OS users to cause a denial of service (hypervisor crash) or gain privileges by triggering a grant-table transition from v2 to v1.

Опубликовано: 2018-02-27Изменено: 2024-11-21

CVSS 2.0СРЕДНЯЯ 6.1

CVSS:2.0/AV:L/AC:L/Au:N/C:P/I:P/A:C

CVSS 3.xВЫСОКАЯ 8.8

CVSS:3.x/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Ссылки

CVE-2018-7542

MEDIUM6.5

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service (NULL pointer dereference and hypervisor crash) by leveraging the mishandling of configurations that lack a Local APIC.

Опубликовано: 2018-02-27Изменено: 2024-11-21

CVSS 2.0СРЕДНЯЯ 4.9

CVSS:2.0/AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS 3.xСРЕДНЯЯ 6.5

CVSS:3.x/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Ссылки

CVE-2018-8897

HIGH7.8

A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.

Опубликовано: 2018-05-08Изменено: 2024-11-21

CVSS 2.0ВЫСОКАЯ 7.2

CVSS:2.0/AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS 3.xВЫСОКАЯ 7.8

CVSS:3.x/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Ссылки

Обновление пакета xen в ветке sisyphus

Закрытые проблемы (6)

Уязвимость ядра операционных систем Linux, Windows, Ubuntu, Debian GNU/Linux, Red Hat Enterprise Linux, macOS, EulerOS, позволяющая нарушителю повысить свои привилегии

An issue was discovered in Xen through 4.10.x allowing x86 PV guest OS users to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing.

An issue was discovered in Xen through 4.10.x allowing guest OS users to cause a denial of service (hypervisor crash) or gain privileges by triggering a grant-table transition from v2 to v1.

An issue was discovered in Xen 4.8.x through 4.10.x allowing x86 PVH guest OS users to cause a denial of service (NULL pointer dereference and hypervisor crash) by leveraging the mishandling of configurations that lack a Local APIC.