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CVE-2018-12893

6.5 · MEDIUM

An issue was discovered in Xen through 4.10.x.

Published Jul 2, 2018EPSS 0.41%

Overview

CVE-2018-12893 is a medium-severity vulnerability. It was published on July 2, 2018 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2018/06/27/11Refwww.securityfocus.com/bid/104572Refwww.securitytracker.com/id/1041202Refxenbits.xen.org/xsa/advisory-265.htmlRefbugzilla.redhat.com/show_bug.cgi?id=1590979Reflists.debian.org/debian-lts-announce/2018/11/msg00013.htmlRefsecurity.gentoo.org/glsa/201810-06Refsupport.citrix.com/article/CTX235748Refwww.debian.org/security/2018/dsa-4236Refwww.openwall.com/lists/oss-security/2018/06/27/11

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12893?

CVE-2018-12893 is a medium-severity vulnerability. It was published on July 2, 2018 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

How severe is CVE-2018-12893?

This vulnerability has a CVSS 3.0 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-12893?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-12893?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12893 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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