CVE-2018-12893
Xen Debug Exception Livelock DoS Vulnerability
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.
INFO
Published Date :
July 2, 2018, 5:29 p.m.
Last Modified :
Oct. 3, 2019, 12:03 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2018-12893.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2018/06/27/11 | Mitigation Mailing List Third Party Advisory Patch |
| 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 | Mitigation Issue Tracking 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2018-12893 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2018-12893 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Oct. 03, 2019
Action Type Old Value New Value Changed CWE CWE-264 CWE-264 NVD-CWE-noinfo -
CVE Modified by [email protected]
Nov. 13, 2018
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html [No Types Assigned] -
CVE Modified by [email protected]
Oct. 31, 2018
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/201810-06 [No Types Assigned] -
Initial Analysis by [email protected]
Sep. 04, 2018
Action Type Old Value New Value Added CVSS V2 (AV:L/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3 AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type https://bugzilla.redhat.com/show_bug.cgi?id=1590979 No Types Assigned https://bugzilla.redhat.com/show_bug.cgi?id=1590979 Issue Tracking, Mitigation, Third Party Advisory Changed Reference Type http://www.securityfocus.com/bid/104572 No Types Assigned http://www.securityfocus.com/bid/104572 Third Party Advisory, VDB Entry Changed Reference Type https://support.citrix.com/article/CTX235748 No Types Assigned https://support.citrix.com/article/CTX235748 Vendor Advisory Changed Reference Type http://xenbits.xen.org/xsa/advisory-265.html No Types Assigned http://xenbits.xen.org/xsa/advisory-265.html Mitigation, Patch, Vendor Advisory Changed Reference Type http://www.securitytracker.com/id/1041202 No Types Assigned http://www.securitytracker.com/id/1041202 Third Party Advisory, VDB Entry Changed Reference Type https://www.debian.org/security/2018/dsa-4236 No Types Assigned https://www.debian.org/security/2018/dsa-4236 Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2018/06/27/11 No Types Assigned http://www.openwall.com/lists/oss-security/2018/06/27/11 Mailing List, Mitigation, Patch, Third Party Advisory Added CWE CWE-264 Added CPE Configuration OR *cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:x86 versions up to (including) 4.10.0 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 04, 2018
Action Type Old Value New Value Added Reference https://www.debian.org/security/2018/dsa-4236 [No Types Assigned] Added Reference https://support.citrix.com/article/CTX235748 [No Types Assigned] Added Reference http://www.securitytracker.com/id/1041202 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2018-12893 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2018-12893
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.02%
score
0.24734
percentile