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CVE-2018-8897Date: (C)2018-05-10   (M)2018-10-04


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.8CVSS Score : 7.2
Exploit Score: 1.8Exploit Score: 3.9
Impact Score: 5.9Impact Score: 10.0
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: LOWAuthentication: NONE
User Interaction: NONEConfidentiality: COMPLETE
Scope: UNCHANGEDIntegrity: COMPLETE
Confidentiality: HIGHAvailability: COMPLETE
Integrity: HIGH 
Availability: HIGH 
  
Reference:
BID-104071
SECTRACK-1040744
SECTRACK-1040849
SECTRACK-1040861
SECTRACK-1040866
SECTRACK-1040882
EXPLOIT-DB-44697
EXPLOIT-DB-45024
DSA-4196
DSA-4201
RHSA-2018:1318
RHSA-2018:1319
RHSA-2018:1345
RHSA-2018:1346
RHSA-2018:1347
RHSA-2018:1348
RHSA-2018:1349
RHSA-2018:1350
RHSA-2018:1351
RHSA-2018:1352
RHSA-2018:1353
RHSA-2018:1354
RHSA-2018:1355
RHSA-2018:1524
USN-3641-1
USN-3641-2
https://lists.debian.org/debian-lts-announce/2018/05/msg00015.html
https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
http://openwall.com/lists/oss-security/2018/05/08/1
http://openwall.com/lists/oss-security/2018/05/08/4
https://bugzilla.redhat.com/show_bug.cgi?id=1567074
https://github.com/can1357/CVE-2018-8897/
https://github.com/torvalds/linux/commit/d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
https://patchwork.kernel.org/patch/10386677/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8897
https://security.netapp.com/advisory/ntap-20180927-0002/
https://support.apple.com/HT208742
https://support.citrix.com/article/CTX234679
https://svnweb.freebsd.org/base?view=revision&revision=333368
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:06.debugreg.asc
https://www.synology.com/support/security/Synology_SA_18_21
https://www.triplefault.io/2018/05/spurious-db-exceptions-with-pop-ss.html
https://xenbits.xen.org/xsa/advisory-260.html

CPE    117
cpe:/o:debian:debian_linux:9.0
cpe:/o:redhat:enterprise_linux_workstation:7.0
cpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~
cpe:/o:canonical:ubuntu_linux:16.04::~~lts~~~
...
CWE    1
CWE-264
OVAL    50
oval:org.secpod.oval:def:502332
oval:org.secpod.oval:def:204852
oval:org.secpod.oval:def:45418
oval:org.secpod.oval:def:45419
...

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