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Test ID:1.3.6.1.4.1.25623.1.0.704196
Category:Debian Local Security Checks
Title:Debian Security Advisory DSA 4196-1 (linux - security update)
Summary:Several vulnerabilities have been discovered in the Linux kernel that;may lead to a privilege escalation or denial of service.;;CVE-2018-1087;Andy Lutomirski discovered that the KVM implementation did not;properly handle #DB exceptions while deferred by MOV SS/POP SS,;allowing an unprivileged KVM guest user to crash the guest or;potentially escalate their privileges.;;CVE-2018-8897;Nick Peterson of Everdox Tech LLC discovered that #DB exceptions;that are deferred by MOV SS or POP SS are not properly handled,;allowing an unprivileged user to crash the kernel and cause a denial;of service.
Description:Summary:
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation or denial of service.

CVE-2018-1087
Andy Lutomirski discovered that the KVM implementation did not
properly handle #DB exceptions while deferred by MOV SS/POP SS,
allowing an unprivileged KVM guest user to crash the guest or
potentially escalate their privileges.

CVE-2018-8897
Nick Peterson of Everdox Tech LLC discovered that #DB exceptions
that are deferred by MOV SS or POP SS are not properly handled,
allowing an unprivileged user to crash the kernel and cause a denial
of service.

Affected Software/OS:
linux on Debian Linux

Solution:
For the oldstable distribution (jessie), these problems have been fixed
in version 3.16.56-1+deb8u1. This update includes various fixes for
regressions from 3.16.56-1 as released in DSA-4187-1 (Cf. #897427, #898067 and #898100).

For the stable distribution (stretch), these problems have been fixed in
version 4.9.88-1+deb9u1. The fix for CVE-2018-1108
applied in DSA-4188-1
is temporarily reverted due to various regression, cf. #897599.

We recommend that you upgrade your linux packages.

CVSS Score:
7.2

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

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2018-1087
BugTraq ID: 104127
http://www.securityfocus.com/bid/104127
Debian Security Information: DSA-4196 (Google Search)
https://www.debian.org/security/2018/dsa-4196
http://www.openwall.com/lists/oss-security/2018/05/08/5
https://access.redhat.com/security/vulnerabilities/pop_ss
RedHat Security Advisories: RHSA-2018:1318
https://access.redhat.com/errata/RHSA-2018:1318
RedHat Security Advisories: RHSA-2018:1345
https://access.redhat.com/errata/RHSA-2018:1345
RedHat Security Advisories: RHSA-2018:1347
https://access.redhat.com/errata/RHSA-2018:1347
RedHat Security Advisories: RHSA-2018:1348
https://access.redhat.com/errata/RHSA-2018:1348
RedHat Security Advisories: RHSA-2018:1355
https://access.redhat.com/errata/RHSA-2018:1355
RedHat Security Advisories: RHSA-2018:1524
https://access.redhat.com/errata/RHSA-2018:1524
http://www.securitytracker.com/id/1040862
https://usn.ubuntu.com/3641-1/
https://usn.ubuntu.com/3641-2/
Common Vulnerability Exposure (CVE) ID: CVE-2018-8897
BugTraq ID: 104071
http://www.securityfocus.com/bid/104071
CERT/CC vulnerability note: VU#631579
https://www.kb.cert.org/vuls/id/631579
Debian Security Information: DSA-4201 (Google Search)
https://www.debian.org/security/2018/dsa-4201
https://www.exploit-db.com/exploits/44697/
https://www.exploit-db.com/exploits/45024/
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://support.apple.com/HT208742
https://svnweb.freebsd.org/base?view=revision&revision=333368
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:06.debugreg.asc
https://www.triplefault.io/2018/05/spurious-db-exceptions-with-pop-ss.html
https://xenbits.xen.org/xsa/advisory-260.html
https://lists.debian.org/debian-lts-announce/2018/05/msg00015.html
https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html
RedHat Security Advisories: RHSA-2018:1319
https://access.redhat.com/errata/RHSA-2018:1319
RedHat Security Advisories: RHSA-2018:1346
https://access.redhat.com/errata/RHSA-2018:1346
RedHat Security Advisories: RHSA-2018:1349
https://access.redhat.com/errata/RHSA-2018:1349
RedHat Security Advisories: RHSA-2018:1350
https://access.redhat.com/errata/RHSA-2018:1350
RedHat Security Advisories: RHSA-2018:1351
https://access.redhat.com/errata/RHSA-2018:1351
RedHat Security Advisories: RHSA-2018:1352
https://access.redhat.com/errata/RHSA-2018:1352
RedHat Security Advisories: RHSA-2018:1353
https://access.redhat.com/errata/RHSA-2018:1353
RedHat Security Advisories: RHSA-2018:1354
https://access.redhat.com/errata/RHSA-2018:1354
http://www.securitytracker.com/id/1040744
http://www.securitytracker.com/id/1040849
http://www.securitytracker.com/id/1040861
http://www.securitytracker.com/id/1040866
http://www.securitytracker.com/id/1040882
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