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CVE-2017-12855

6.5 · MEDIUM

Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use.

Published Aug 15, 2017CWE-200EPSS 0.40%

Overview

CVE-2017-12855 is a medium-severity vulnerability. It was published on August 15, 2017 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

Xen maintains the _GTF_{read,writ}ing bits as appropriate, to inform the guest that a grant is in use. A guest is expected not to modify the grant details while it is in use, whereas the guest is free to modify/reuse the grant entry when it is not in use. Under some circumstances, Xen will clear the status bits too early, incorrectly informing the guest that the grant is no longer in use. A guest may prematurely believe that a granted frame is safely private again, and reuse it in a way which contains sensitive information, while the domain on the far end of the grant is still using the grant. Xen 4.9, 4.8, 4.7, 4.6, and 4.5 are affected.

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.debian.org/security/2017/dsa-3969Refwww.securityfocus.com/bid/100341Refwww.securitytracker.com/id/1039177Refxenbits.xen.org/xsa/advisory-230.htmlRefsupport.citrix.com/article/CTX225941Refwww.debian.org/security/2017/dsa-3969Refwww.securityfocus.com/bid/100341Refwww.securitytracker.com/id/1039177Refxenbits.xen.org/xsa/advisory-230.htmlRefsupport.citrix.com/article/CTX225941

How CyberStrike helps

Frequently asked questions

What is CVE-2017-12855?

CVE-2017-12855 is a medium-severity vulnerability. It was published on August 15, 2017 and has a CVSS 3.0 base score of 6.5 (MEDIUM).

How severe is CVE-2017-12855?

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-2017-12855?

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-2017-12855?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-12855 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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