Vulnerability CVE-2018-1087


Published: 2018-05-15

Description:
kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

Type:

CWE-264

(Permissions, Privileges, and Access Controls)

Vendor: Debian
Product: Debian linux 
Version: 9.0; 8.0;
Vendor: Redhat
Product: Enterprise linux server eus 
Version:
7.5
7.4
7.3
Product: Enterprise linux server aus 
Version:
7.4
7.3
7.2
Product: Enterprise linux server tus 
Version:
7.4
7.3
7.2
Product: Enterprise linux 
Version: 7.0;
Product: Enterprise linux server 
Version: 7.0;
Product: Enterprise linux desktop 
Version: 7.0;
Product: Enterprise linux workstation 
Version: 7.0;
Product: Enterprise linux virtualization 
Version: 4.0;
Vendor: Linux
Product: Linux kernel 
Version: 4.17; 4.16;
Vendor: Canonical
Product: Ubuntu linux 
Version:
17.10
16.04
14.04

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

 References:
http://www.openwall.com/lists/oss-security/2018/05/08/5
http://www.securityfocus.com/bid/104127
http://www.securitytracker.com/id/1040862
https://access.redhat.com/errata/RHSA-2018:1318
https://access.redhat.com/errata/RHSA-2018:1345
https://access.redhat.com/errata/RHSA-2018:1347
https://access.redhat.com/errata/RHSA-2018:1348
https://access.redhat.com/errata/RHSA-2018:1355
https://access.redhat.com/errata/RHSA-2018:1524
https://access.redhat.com/security/vulnerabilities/pop_ss
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1087
https://usn.ubuntu.com/3641-1/
https://usn.ubuntu.com/3641-2/
https://www.debian.org/security/2018/dsa-4196

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