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nvd[email protected]NVD:CVE-2018-8897
HistoryMay 08, 2018 - 6:29 p.m.

CVE-2018-8897

2018-05-0818:29:00
CWE-362
web.nvd.nist.gov
1

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

31.1%

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.

Affected configurations

NVD
Node
debiandebian_linuxMatch7.0
OR
debiandebian_linuxMatch8.0
OR
debiandebian_linuxMatch9.0
Node
canonicalubuntu_linuxMatch14.04lts
OR
canonicalubuntu_linuxMatch16.04lts
OR
canonicalubuntu_linuxMatch17.10
Node
redhatenterprise_linux_serverMatch7.0
OR
redhatenterprise_linux_workstationMatch7.0
OR
redhatenterprise_virtualization_managerMatch3.0
Node
citrixxenserverMatch6.0.2
OR
citrixxenserverMatch6.2.0
OR
citrixxenserverMatch6.5
OR
citrixxenserverMatch7.0
OR
citrixxenserverMatch7.1
OR
citrixxenserverMatch7.2
OR
citrixxenserverMatch7.3
OR
citrixxenserverMatch7.4
Node
synologyskynasMatch-
OR
synologydiskstation_managerMatch5.2
OR
synologydiskstation_managerMatch6.0
OR
synologydiskstation_managerMatch6.1
Node
applemac_os_xRange<10.13.4
Node
xenxenMatch-x86
Node
freebsdfreebsdRange11.0–11.1

References

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

6.6

Confidence

High

EPSS

0.001

Percentile

31.1%