ALT-BU-2017-3063-2

Branch sisyphus update bulletin.

Package xen updated to version 4.8.1-alt1 for branch sisyphus in task 181789.

Уязвимость гипервизора Xen, позволяющая нарушителю получить доступ к памяти гипервизора

Severity: HIGH (7.2)Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

References:

Xen through 4.8.x allows local 64-bit x86 HVM guest OS users to gain privileges by leveraging mishandling of SYSCALL singlestep during emulation.

Severity: MEDIUM (4.6)Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Severity: HIGH (7.8)Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References:

Xen through 4.8.x allows local x86 PV guest OS kernel administrators to cause a denial of service (host hang or crash) by modifying the instruction stream asynchronously while performing certain kernel operations.

Severity: MEDIUM (4.9)Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C

Severity: MEDIUM (6.0)Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

References:

VMFUNC emulation in Xen 4.6.x through 4.8.x on x86 systems using AMD virtualization extensions (aka SVM) allows local HVM guest OS users to cause a denial of service (hypervisor crash) by leveraging a missing NULL pointer check.

Severity: LOW (2.1)Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

Severity: MEDIUM (5.5)Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References:

An issue (known as XSA-212) was discovered in Xen, with fixes available for 4.8.x, 4.7.x, 4.6.x, 4.5.x, and 4.4.x. The earlier XSA-29 fix introduced an insufficient check on XENMEM_exchange input, allowing the caller to drive hypervisor memory accesses outside of the guest provided input/output arrays.

Severity: HIGH (7.2)Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: HIGH (8.2)Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References:

Version: 2.1.2

Branch sisyphus update on 2017-04-17

ALT-BU-2017-3063-2

ALT-PU-2017-1483-2

Closed vulnerabilities

BDU:2017-01569

CVE-2016-10013

CVE-2016-10024

CVE-2016-10025

CVE-2017-7228