CVE-2018-12893 Detail

Current Description

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  6.5 MEDIUM
Vector:  CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2018/06/27/11 Mailing List  Mitigation  Patch  Third Party Advisory 
http://www.securityfocus.com/bid/104572 Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1041202 Third Party Advisory  VDB Entry 
http://xenbits.xen.org/xsa/advisory-265.html Mitigation  Patch  Vendor Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=1590979 Issue Tracking  Mitigation  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html
https://security.gentoo.org/glsa/201810-06
https://support.citrix.com/article/CTX235748 Vendor Advisory 
https://www.debian.org/security/2018/dsa-4236 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

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Quick Info

CVE Dictionary Entry:
CVE-2018-12893
NVD Published Date:
07/02/2018
NVD Last Modified:
10/02/2019
Source:
MITRE