Bug 1879567 (CVE-2020-25599) - CVE-2020-25599 xen: races with evtchn_reset function (XSA-343)
Summary: CVE-2020-25599 xen: races with evtchn_reset function (XSA-343)
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25599
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1881581
Blocks: 1877386
TreeView+ depends on / blocked
 
Reported: 2020-09-16 14:24 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 19:15 UTC (History)
25 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-09-22 20:41:30 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-09-16 14:24:39 UTC 
Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks.
Comment 1 Mauro Matteo Cascella 2020-09-16 16:10:11 UTC 
Acknowledgments:

Name: the Xen project
Comment 2 Mauro Matteo Cascella 2020-09-17 13:31:17 UTC 
Statement:

All Xen versions from 4.4 onwards are vulnerable. Red Hat Enterprise Linux 5 is not affected by this flaw, as it shipped an older version of Xen.
Comment 3 Mauro Matteo Cascella 2020-09-17 13:31:19 UTC 
Mitigation:

There is no known mitigation for this flaw apart from applying the patch.
Comment 4 Mauro Matteo Cascella 2020-09-22 17:48:14 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1881581]
Comment 5 Product Security DevOps Team 2020-09-22 20:41:30 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25599
Comment 6 Mauro Matteo Cascella 2020-09-23 07:36:39 UTC 
External References:

https://xenbits.xen.org/xsa/advisory-343.html
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