Bug 1908845 (CVE-2020-35498) - CVE-2020-35498 openvswitch: limitation in the OVS packet parsing in userspace leads to DoS
Summary: CVE-2020-35498 openvswitch: limitation in the OVS packet parsing in userspace...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-35498
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: 1910206 1910207 1909048 1909049 1909050 1909051 1909052 1909053 1909054 1909056 1909059 1909060 1909107 1909193 1909194 1927492 1927493 1927591 1927845
Blocks: 1903805
TreeView+ depends on / blocked
 
Reported: 2020-12-17 17:48 UTC by Dhananjay Arunesh
Modified: 2021-07-09 07:18 UTC (History)
48 users (show)

Fixed In Version: openvswitch 2.5.12, openvswitch 2.6.10, openvswitch 2.7.13, openvswitch 2.8.11, openvswitch 2.9.9, openvswitch 2.10.7, openvswitch 2.11.6, openvswitch 2.12.3, openvswitch 2.13.3, openvswitch 2.14.2
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-02-11 16:10:02 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:2520 0 None None None 2021-06-22 13:00:46 UTC
Red Hat Product Errata RHSA-2021:0497 0 None None None 2021-02-11 14:52:16 UTC
Red Hat Product Errata RHSA-2021:0834 0 None None None 2021-03-15 14:35:10 UTC
Red Hat Product Errata RHSA-2021:0835 0 None None None 2021-03-15 14:35:41 UTC
Red Hat Product Errata RHSA-2021:0837 0 None None None 2021-03-15 14:33:33 UTC
Red Hat Product Errata RHSA-2021:2456 0 None None None 2021-06-16 10:57:44 UTC

Description Dhananjay Arunesh 2020-12-17 17:48:22 UTC 
Due to a limitation in the OVS packet parsing in userspace, the resulting megaflow in the kernel is too wide which can potentially cause a DoS.
Comment 10 Anten Skrabec 2021-02-08 23:29:12 UTC 
Acknowledgments:

Name: Joakim Hindersson <joakim.hindersson>
Comment 12 Anten Skrabec 2021-02-10 20:36:48 UTC 
Created openvswitch tracking bugs for this issue:

Affects: fedora-all [bug 1927492]
Affects: openstack-rdo [bug 1927493]
Comment 13 Anten Skrabec 2021-02-10 21:01:33 UTC 
External References:

https://www.openwall.com/lists/oss-security/2021/02/10/4
Comment 14 Anten Skrabec 2021-02-10 21:20:29 UTC 
Upstream Commits:

* master
https://github.com/openvswitch/ovs/commit/79349cbab0b2a755140eedb91833ad2760520a83

* 2.15
https://github.com/openvswitch/ovs/commit/0625dc79aec73b966f206e55655a2816696246d0

* 2.14
https://github.com/openvswitch/ovs/commit/59b588604b89e85b463984ba08a99badb4fcba15

* 2.13
https://github.com/openvswitch/ovs/commit/3512fb512c76a1f08eba4005aa2eb69160d0840e

* 2.12
https://github.com/openvswitch/ovs/commit/53c1b8b166f3dd217bc391d707885f789e9ecc49

* 2.11
https://github.com/openvswitch/ovs/commit/abd7a457652e6734902720fe6a5dddb3fc0d1e3b

* 2.10
https://github.com/openvswitch/ovs/commit/79cec1a736b91548ec882d840986a11affda1068

* 2.9
https://github.com/openvswitch/ovs/commit/48ceca0446b1c2c2c03e7551048c5b19ed23cc97

* 2.8
https://github.com/openvswitch/ovs/commit/35c280072c1c3ed58202745b7d27fbbd0736999b

* 2.7
https://github.com/openvswitch/ovs/commit/ad0d22f6435b43ecfc30c0e877d490d36721f200

* 2.6
https://github.com/openvswitch/ovs/commit/673c08eee8c8d4f2999ddd31524de7ff0f72b559

* 2.5
https://github.com/openvswitch/ovs/commit/354e7d860e444fd1472541b0fdc3b8678aa74828
Comment 15 Anten Skrabec 2021-02-10 21:25:13 UTC 
Statement:

Red Hat OpenStack Platform 13's openvswitch package will receive it's fixes from Fast Datapath.
Comment 17 errata-xmlrpc 2021-02-11 14:52:13 UTC 
This issue has been addressed in the following products:

  Fast Datapath for Red Hat Enterprise Linux 8

Via RHSA-2021:0497 https://access.redhat.com/errata/RHSA-2021:0497
Comment 18 Product Security DevOps Team 2021-02-11 16:10:02 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-2020-35498
Comment 19 errata-xmlrpc 2021-03-15 14:33:26 UTC 
This issue has been addressed in the following products:

  Fast Datapath for Red Hat Enterprise Linux 8

Via RHSA-2021:0837 https://access.redhat.com/errata/RHSA-2021:0837
Comment 20 errata-xmlrpc 2021-03-15 14:35:07 UTC 
This issue has been addressed in the following products:

  Fast Datapath for Red Hat Enterprise Linux 7

Via RHSA-2021:0834 https://access.redhat.com/errata/RHSA-2021:0834
Comment 21 errata-xmlrpc 2021-03-15 14:35:38 UTC 
This issue has been addressed in the following products:

  Fast Datapath for Red Hat Enterprise Linux 7

Via RHSA-2021:0835 https://access.redhat.com/errata/RHSA-2021:0835
Comment 22 errata-xmlrpc 2021-03-31 12:57:00 UTC 
This issue has been addressed in the following products:

  Red Hat Virtualization 4 for Red Hat Enterprise Linux 7

Via RHSA-2021:1050 https://access.redhat.com/errata/RHSA-2021:1050
Comment 23 errata-xmlrpc 2021-05-20 19:30:08 UTC 
This issue has been addressed in the following products:

  Fast Datapath for Red Hat Enterprise Linux 7

Via RHSA-2021:2077 https://access.redhat.com/errata/RHSA-2021:2077
Comment 24 errata-xmlrpc 2021-06-16 10:57:34 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 13.0 (Queens)

Via RHSA-2021:2456 https://access.redhat.com/errata/RHSA-2021:2456
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