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CVE-2018-8897

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Date: May 8, 2018

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.

Language: C

Severity Score

7.8

Related Resources (53)

Url: https://usn.ubuntu.com/3641-2/

Url: https://github.com/can1357/CVE-2018-8897/

Url: https://access.redhat.com/errata/RHSA-2018:1524

Url: https://www.triplefault.io/2018/05/spurious-db-exceptions-with-pop-ss.html

Url: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8897

Url: https://www.synology.com/support/security/Synology_SA_18_21

Url: https://www.debian.org/security/2018/dsa-4201

Url: https://bugzilla.redhat.com/show_bug.cgi?id=1567074

Url: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9

Url: http://www.securitytracker.com/id/1040882

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2018-8897

Url: https://xenbits.xen.org/xsa/advisory-260.html

Url: http://www.securitytracker.com/id/1040849

Url: https://access.redhat.com/errata/RHSA-2018:1318

Url: https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html

Url: https://access.redhat.com/errata/RHSA-2018:1319

Url: https://usn.ubuntu.com/3641-1/

Url: https://www.freebsd.org/security/advisories/FreeBSD-SA-18:06.debugreg.asc

Url: http://www.securityfocus.com/bid/104071

Url: https://svnweb.freebsd.org/base?view=revision&revision=333368

Url: https://lists.debian.org/debian-lts-announce/2018/05/msg00015.html

Url: https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0

Url: https://access.redhat.com/security/cve/CVE-2018-8897

Url: https://nvd.nist.gov/vuln/detail/CVE-2018-8897

Url: https://www.debian.org/security/2018/dsa-4196

Url: https://security.netapp.com/advisory/ntap-20180927-0002/

Url: https://www.kb.cert.org/vuls/id/631579

Url: https://access.redhat.com/errata/RHSA-2018:1349

Url: https://access.redhat.com/errata/RHSA-2018:1347

Url: https://www.exploit-db.com/exploits/44697/

Url: https://access.redhat.com/errata/RHSA-2018:1348

Url: https://security-tracker.debian.org/tracker/CVE-2018-8897

Url: http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190921-01-debug-en

Url: https://github.com/torvalds/linux/commit/d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9

Url: http://www.securitytracker.com/id/1040866

Url: http://www.securitytracker.com/id/1040744

Url: https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html

Url: http://www.securitytracker.com/id/1040861

Url: https://access.redhat.com/errata/RHSA-2018:1354

Url: https://access.redhat.com/errata/RHSA-2018:1355

Url: https://access.redhat.com/errata/RHSA-2018:1352

Url: https://access.redhat.com/errata/RHSA-2018:1353

Url: https://access.redhat.com/errata/RHSA-2018:1350

Url: https://access.redhat.com/errata/RHSA-2018:1351

Url: https://support.apple.com/HT208742

Url: http://openwall.com/lists/oss-security/2018/05/08/1

Url: http://openwall.com/lists/oss-security/2018/05/08/4

Url: https://patchwork.kernel.org/patch/10386677/

Url: https://access.redhat.com/errata/RHSA-2018:1345

Url: https://access.redhat.com/errata/RHSA-2018:1346

Url: https://www.exploit-db.com/exploits/45024/

Url: https://support.citrix.com/article/CTX234679

Url: https://www.mend.io/vulnerability-database/CVE-2018-8897

Severity Score

7.8

Weakness Type (CWE)

Race Conditions

CWE-362

Top Fix

Upgrade Version

Upgrade to version 4.11.0-rc4

CVSS v3.1

Base Score:	7.8
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.2
Access Vector (AV):	LOCAL
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	COMPLETE
Integrity (I):	COMPLETE
Availability (A):	COMPLETE
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