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high7.8Public exploit code

CVE-2018-8897

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…

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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 products

VendorProductAffected versions
DebianDebian Linux
Versions 7.0, 8.0, 9.0
CanonicalUbuntu Linux
Versions 14.04, 16.04, 17.10
RedhatEnterprise Linux Server
Version 7.0
RedhatEnterprise Linux Workstation
Version 7.0
RedhatEnterprise Virtualization Manager
Version 3.0
CitrixXenserver
Versions 6.0.2, 6.2.0, 6.5, 7.0, 7.1, 7.2
SynologySkynas
All versions
SynologyDiskstation Manager
Versions 5.2, 6.0, 6.1
AppleMac Os X
before 10.13.4
XenXen
All versions
FreebsdFreebsd
from 11.0 before 11.1

Weakness classification

CWE-362

References