CVE-2018-12893medium
New! CVE Severity Now Using CVSS v3
The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
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.
References
http://www.openwall.com/lists/oss-security/2018/06/27/11
http://www.securityfocus.com/bid/104572
http://www.securitytracker.com/id/1041202
http://xenbits.xen.org/xsa/advisory-265.html
https://bugzilla.redhat.com/show_bug.cgi?id=1590979
https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html
https://security.gentoo.org/glsa/201810-06
Details
Source: MITRE
Published: 2018-07-02
Updated: 2019-10-03
Type: NVD-CWE-noinfo
Risk Information
CVSS v2
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
CVSS v3
Base Score: 6.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Impact Score: 4
Exploitability Score: 2
Severity: MEDIUM
Vulnerable Software
Configuration 1
OR
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:x86 versions up to 4.10.0 (inclusive)
Configuration 2
OR
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 123224 | openSUSE Security Update : xen (openSUSE-2019-533) | Nessus | SuSE Local Security Checks | critical |
| 120682 | Fedora 28 : xen (2018-a7862a75f5) | Nessus | Fedora Local Security Checks | critical |
| 120050 | SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2018:1981-1) | Nessus | SuSE Local Security Checks | critical |
| 118892 | Debian DLA-1577-1 : xen security update | Nessus | Debian Local Security Checks | high |
| 118506 | GLSA-201810-06 : Xen: Multiple vulnerabilities (Foreshadow) (Meltdown) (Spectre) | Nessus | Gentoo Local Security Checks | critical |
| 118277 | SUSE SLES12 Security Update : xen (SUSE-SU-2018:2081-2) | Nessus | SuSE Local Security Checks | critical |
| 112147 | SUSE SLES11 Security Update : xen (SUSE-SU-2018:2528-1) (Foreshadow) (Meltdown) (Spectre) | Nessus | SuSE Local Security Checks | high |
| 111565 | openSUSE Security Update : xen (openSUSE-2018-803) | Nessus | SuSE Local Security Checks | critical |
| 111433 | SUSE SLES12 Security Update : xen (SUSE-SU-2018:2081-1) | Nessus | SuSE Local Security Checks | critical |
| 111418 | openSUSE Security Update : xen (openSUSE-2018-766) | Nessus | SuSE Local Security Checks | critical |
| 111380 | Xen Project x86 Debug Exception Handling Local DoS (XSA-265) | Nessus | Misc. | medium |
| 111378 | Citrix XenServer Multiple Vulnerabilities (CTX235748) | Nessus | Misc. | medium |
| 111371 | SUSE SLES12 Security Update : xen (SUSE-SU-2018:2069-1) | Nessus | SuSE Local Security Checks | high |
| 111348 | SUSE SLED12 / SLES12 Security Update : xen (SUSE-SU-2018:2059-1) | Nessus | SuSE Local Security Checks | critical |
| 111346 | SUSE SLES12 Security Update : xen (SUSE-SU-2018:2056-1) | Nessus | SuSE Local Security Checks | high |
| 111261 | SUSE SLES11 Security Update : xen (SUSE-SU-2018:2037-1) | Nessus | SuSE Local Security Checks | high |
| 111236 | Fedora 27 : xen (2018-1a467757ce) | Nessus | Fedora Local Security Checks | critical |
| 110787 | Debian DSA-4236-1 : xen - security update | Nessus | Debian Local Security Checks | critical |