medium
5.5
CWE
755
Advisory Published
Updated

CVE-2020-11743

First published: Tue Apr 14 2020(Updated: )

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Xen Xen<=4.13.0
Xen Xen=4.13.0-rc1
Xen Xen=4.13.0-rc2
Fedoraproject Fedora=32
debian/xen
4.14.6-1
4.14.5+94-ge49571868d-1
4.17.3+10-g091466ba55-1~deb12u1
4.17.3+36-g54dacb5c02-1

Remedy

http://www.openwall.com/lists/oss-security/2020/04/14/3

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Reference Links

Frequently Asked Questions

  • What is CVE-2020-11743?

    CVE-2020-11743 is a vulnerability in Xen that allows guest OS users to cause a denial of service.

  • How does CVE-2020-11743 cause a denial of service?

    CVE-2020-11743 causes a denial of service due to a bad error path in GNTTABOP_map_grant, which can be triggered by guest OS users.

  • Which versions of Xen are affected by CVE-2020-11743?

    Xen versions up to and including 4.13.x are affected by CVE-2020-11743.

  • How can I fix CVE-2020-11743?

    To fix CVE-2020-11743, update Xen to version 4.11.3+24- or later, depending on your operating system.

  • Where can I find more information about CVE-2020-11743?

    You can find more information about CVE-2020-11743 at the following references: [Xen Advisory 316](http://xenbits.xen.org/xsa/advisory-316.html), [Xen Advisory 316](https://xenbits.xen.org/xsa/advisory-316.html), [Openwall](http://www.openwall.com/lists/oss-security/2020/04/14/3).

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