GoogleOSV:CVE-2018-8897CVE-2018-8897
7.8 High
CVSS3
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
6.6 Medium
AI Score
Confidence
High
7.2 High
CVSS2
Access Vector
LOCAL
Access 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
0.001 Low
EPSS
Percentile
29.2%
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.
| CPE | Name | Operator | Version |
|---|---|---|---|
| xen | eq | 4.8.2-r2 | |
| linux.git | eq | 2.6.14 | |
| xen | eq | 4.6.3-r2 | |
| linux.git | eq | 2.6.29-rc6 | |
| linux.git | eq | 4.4-rc5 | |
| linux.git | eq | 3.8-rc4 | |
| xen | eq | 4.0.1-r3 | |
| linux.git | eq | 2.6.16-rc1 | |
| linux.git | eq | 2.6.12-rc3 | |
| linux.git | eq | 2.6.13-rc2 |
References
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
openwall.com/lists/oss-security/2018/05/08/1
openwall.com/lists/oss-security/2018/05/08/4
www.huawei.com/en/psirt/security-advisories/huawei-sa-20190921-01-debug-en
www.securityfocus.com/bid/104071
www.securitytracker.com/id/1040744
www.securitytracker.com/id/1040849
www.securitytracker.com/id/1040861
www.securitytracker.com/id/1040866
www.securitytracker.com/id/1040882
access.redhat.com/errata/RHSA-2018:1318
access.redhat.com/errata/RHSA-2018:1319
access.redhat.com/errata/RHSA-2018:1345
access.redhat.com/errata/RHSA-2018:1346
access.redhat.com/errata/RHSA-2018:1347
access.redhat.com/errata/RHSA-2018:1348
access.redhat.com/errata/RHSA-2018:1349
access.redhat.com/errata/RHSA-2018:1350
access.redhat.com/errata/RHSA-2018:1351
access.redhat.com/errata/RHSA-2018:1352
access.redhat.com/errata/RHSA-2018:1353
access.redhat.com/errata/RHSA-2018:1354
access.redhat.com/errata/RHSA-2018:1355
access.redhat.com/errata/RHSA-2018:1524
bugzilla.redhat.com/show_bug.cgi?id=1567074
github.com/can1357/CVE-2018-8897/
github.com/torvalds/linux/commit/d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9
help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0
lists.debian.org/debian-lts-announce/2018/05/msg00015.html
lists.debian.org/debian-lts-announce/2018/06/msg00000.html
lists.debian.org/debian-lts-announce/2018/11/msg00013.html
patchwork.kernel.org/patch/10386677/
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8897
security.netapp.com/advisory/ntap-20180927-0002/
support.apple.com/HT208742
support.citrix.com/article/CTX234679
svnweb.freebsd.org/base?view=revision&revision=333368
usn.ubuntu.com/3641-1/
usn.ubuntu.com/3641-2/
www.debian.org/security/2018/dsa-4196
www.debian.org/security/2018/dsa-4201
www.exploit-db.com/exploits/44697/
www.exploit-db.com/exploits/45024/
www.freebsd.org/security/advisories/FreeBSD-SA-18:06.debugreg.asc
www.kb.cert.org/vuls/id/631579
www.synology.com/support/security/Synology_SA_18_21
www.triplefault.io/2018/05/spurious-db-exceptions-with-pop-ss.html
xenbits.xen.org/xsa/advisory-260.html
Related
7.8 High
CVSS3
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
6.6 Medium
AI Score
Confidence
High
7.2 High
CVSS2
Access Vector
LOCAL
Access 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
0.001 Low
EPSS
Percentile
29.2%