CVE-2018-12893
What it is
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.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of service disruption.
- Exploit odds
- 0.4% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.4% in the next 30 days (EPSS).
- Severity: 6.5 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.4% · EPSS, next 30 days
- Record status
- Modified
Affected
- Xen ≤ 4.10.0
- Debian Linux 9.0
Attack profile CVSS 3.0 · 6.5
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2018-12893.md and follow it. Check whether this project is affected by CVE-2018-12893. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- http://www.openwall.com/lists/oss-security/2018/06/27/11
- http://xenbits.xen.org/xsa/advisory-265.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979
- https://support.citrix.com/article/CTX235748
- http://www.openwall.com/lists/oss-security/2018/06/27/11
- http://xenbits.xen.org/xsa/advisory-265.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979
- https://support.citrix.com/article/CTX235748
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
- https://support.citrix.com/article/CTX235748
- https://www.debian.org/security/2018/dsa-4236
- 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
- https://support.citrix.com/article/CTX235748
- https://www.debian.org/security/2018/dsa-4236