CVE-2020-35498: High severity Openvswitch OpenvSwitch vulnerability

Published Dec 17, 2020
·
Updated

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.

Other sources

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.

— Red Hat

Affected Software

43 affected componentsFixes available
redhat/openvswitch2.11<0:2.11.3-86.el7fd
0:2.11.3-86.el7fd
redhat/openvswitch2.13<0:2.13.0-81.el7fd
0:2.13.0-81.el7fd
redhat/openvswitch<0:2.9.9-1.el7fd
0:2.9.9-1.el7fd
redhat/openvswitch2.13<0:2.13.0-79.5.el8fd
0:2.13.0-79.5.el8fd
redhat/openvswitch2.11<0:2.11.3-83.el8fd
0:2.11.3-83.el8fd
redhat/ovn2.11<0:2.11.1-57.el7fd
0:2.11.1-57.el7fd
debian/openvswitch<=2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12+deb10u2, <=2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12, <=2.15.0~git20210104.def6eb1ea+dfsg1-4, <=2.10.6+ds1-0+deb10u1
debian/openvswitch
2.10.7+ds1-0+deb10u12.10.7+ds1-0+deb10u42.15.0+ds1-2+deb11u43.1.0-23.2.2~git20231029-2
redhat/openvswitch<2.5.12
2.5.12
redhat/openvswitch<2.6.10
2.6.10
redhat/openvswitch<2.7.13
2.7.13
redhat/openvswitch<2.8.11
2.8.11
redhat/openvswitch<2.9.9
2.9.9
redhat/openvswitch<2.10.7
2.10.7
redhat/openvswitch<2.11.6
2.11.6
redhat/openvswitch<2.12.3
2.12.3
redhat/openvswitch<2.13.3
2.13.3
redhat/openvswitch<2.14.2
2.14.2
Openvswitch OpenvSwitch>=2.5.0<2.5.12
Openvswitch OpenvSwitch>=2.6.0<2.6.10
Openvswitch OpenvSwitch>=2.7.0<2.7.13
Openvswitch OpenvSwitch>=2.8.0<2.8.11
Openvswitch OpenvSwitch>=2.9.0<2.9.9
Openvswitch OpenvSwitch>=2.10.0<2.10.7
Openvswitch OpenvSwitch>=2.11.0<2.11.6
Openvswitch OpenvSwitch>=2.12.0<2.12.3
Openvswitch OpenvSwitch>=2.13.0<2.13.3
Openvswitch OpenvSwitch>=2.14.0<2.14.2
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Fedoraproject Fedora=33
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0
alpine/openvswitch>=2.5.0<2.12.3-r0
2.12.3-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/openvswitch2.11 to a version that resolves this vulnerability.

    Fixed in 0:2.11.3-86.el7fd
  2. Upgrade

    Upgrade redhat/openvswitch2.13 to a version that resolves this vulnerability.

    Fixed in 0:2.13.0-81.el7fd
  3. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 0:2.9.9-1.el7fd
  4. Upgrade

    Upgrade redhat/openvswitch2.13 to a version that resolves this vulnerability.

    Fixed in 0:2.13.0-79.5.el8fd
  5. Upgrade

    Upgrade redhat/openvswitch2.11 to a version that resolves this vulnerability.

    Fixed in 0:2.11.3-83.el8fd
  6. Upgrade

    Upgrade redhat/ovn2.11 to a version that resolves this vulnerability.

    Fixed in 0:2.11.1-57.el7fd
  7. Upgrade

    Upgrade debian/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.10.7+ds1-0+deb10u1Fixed in 2.10.7+ds1-0+deb10u4Fixed in 2.15.0+ds1-2+deb11u4Fixed in 3.1.0-2Fixed in 3.2.2~git20231029-2
  8. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.5.12
  9. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.6.10
  10. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.7.13
  11. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.8.11
  12. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.9.9
  13. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.10.7
  14. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.11.6
  15. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.12.3
  16. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.13.3
  17. Upgrade

    Upgrade redhat/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.14.2
  18. Upgrade

    Upgrade alpine/openvswitch to a version that resolves this vulnerability.

    Fixed in 2.12.3-r0

Event History

Feb 10, 2021
CVE Published
12:00 AM
Feb 11, 2021
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
DescriptionWeakness
Data Sourced
via NVD·06:15 PM
RemedyDescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·06:15 PM
DescriptionSeverityAffected Software
Feb 12, 2021
Exploit Published
via GitHub·02:08 AM

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the vulnerability ID for this openvswitch vulnerability?

The vulnerability ID for this openvswitch vulnerability is CVE-2020-35498.

2

What is the severity of CVE-2020-35498?

The severity of CVE-2020-35498 is high (7.5).

3

What is the affected software for CVE-2020-35498?

The affected software for CVE-2020-35498 is openvswitch.

4

How can a malicious user exploit CVE-2020-35498?

A malicious user can exploit CVE-2020-35498 by sending a specially crafted packet to the openvswitch, causing a denial of service.

5

Is there a remedy for CVE-2020-35498?

Yes, there is a remedy for CVE-2020-35498. The recommended remedy is to update openvswitch to version 2.5.12 or higher.

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