<p>Upgrade <code>Alpine:3.20</code> <code>xen</code> to version 4.13.0-r3 or higher.</p>

CVE-2020-11742 Affecting xen package, versions <4.13.0-r3

Threat Intelligence

0.05% (16^th percentile)

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Snyk ID SNYK-ALPINE320-XEN-7012465
published 23 May 2024
disclosed 14 Apr 2020

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Introduced: 14 Apr 2020

CVE-2020-11742 Open this link in a new tab

How to fix?

Upgrade Alpine:3.20 xen to version 4.13.0-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine. See How to fix? for Alpine:3.20 relevant fixed versions and status.

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Local
Attack Complexity (AC)

Low
Privileges Required (PR)

Low
User Interaction (UI)

None

Scope (S)

Unchanged

Confidentiality (C)

None
Integrity (I)

None
Availability (A)

High