CVE-2020-25645: High severity Linux Linux kernel vulnerability

Published Sep 16, 2020
·
Updated

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Other sources

A flaw was found in the Linux kernel. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

A flaw was found in the Linux kernel's implementation of GENEVE tunnels combined with IPsec. The traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Reference and upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=34beb21594519ce64a55a498c2fe7d567bc1ca20

— Red Hat

Affected Software

100 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-1160.21.1.rt56.1158.el7
0:3.10.0-1160.21.1.rt56.1158.el7
redhat/kernel<0:3.10.0-1160.21.1.el7
0:3.10.0-1160.21.1.el7
redhat/linux kernel<5.9
5.9
Linux Linux kernel<5.9.0
Linux Linux kernel=5.9.0
Linux Linux kernel=5.9.0-rc1
Linux Linux kernel=5.9.0-rc2
Linux Linux kernel=5.9.0-rc3
Linux Linux kernel=5.9.0-rc4
Linux Linux kernel=5.9.0-rc5
Linux Linux kernel=5.9.0-rc6
Debian Debian Linux=9.0
Debian Debian Linux=10.0
NetApp Solidfire \& Hci Management Node
NetApp Solidfire \& Hci Storage Node
openSUSE Leap=15.1
openSUSE Leap=15.2
All of the following
NetApp Hci Compute Node Bios
NetApp Hci Compute Node
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
NetApp Hci Compute Node Bios
NetApp Hci Compute Node
debian/linux
5.10.223-15.10.234-16.1.129-16.1.135-16.12.22-16.12.25-1
ubuntu/linux-aws<4.4.0-1082.86
4.4.0-1082.86
ubuntu/linux-azure<4.15.0-1100.111~14.04.1
4.15.0-1100.111~14.04.1
ubuntu/linux-lts-xenial<4.4.0-197.229~14.04.1
4.4.0-197.229~14.04.1
ubuntu/linux<4.4.0-197.229
4.4.0-197.229
ubuntu/linux-aws<4.4.0-1118.132
4.4.0-1118.132
ubuntu/linux-aws-hwe<4.15.0-1088.93~16.04.1
4.15.0-1088.93~16.04.1
ubuntu/linux-azure<4.15.0-1100.111~16.04.1
4.15.0-1100.111~16.04.1
ubuntu/linux-gcp<4.15.0-1088.101~16.04.1
4.15.0-1088.101~16.04.1
ubuntu/linux-hwe<4.15.0-126.129~16.04.1
4.15.0-126.129~16.04.1
ubuntu/linux-kvm<4.4.0-1084.93
4.4.0-1084.93
ubuntu/linux-oracle<4.15.0-1059.65~16.04.1
4.15.0-1059.65~16.04.1
ubuntu/linux-raspi2<4.4.0-1142.152
4.4.0-1142.152
ubuntu/linux-snapdragon<4.4.0-1146.156
4.4.0-1146.156
ubuntu/linux-hwe-edge*
ubuntu/linux-fips<4.4.0-1051.57
4.4.0-1051.57
ubuntu/linux-fips*
ubuntu/linux<4.15.0-126.129
4.15.0-126.129
ubuntu/linux-aws<4.15.0-1088.93
4.15.0-1088.93
ubuntu/linux-aws-5.4<5.4.0-1030.31~18.04.1
5.4.0-1030.31~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1100.111
4.15.0-1100.111
ubuntu/linux-azure-5.4<5.4.0-1032.33~18.04.1
5.4.0-1032.33~18.04.1
ubuntu/linux-dell300x<4.15.0-1007.11
4.15.0-1007.11
ubuntu/linux-gcp-4.15<4.15.0-1088.101
4.15.0-1088.101
ubuntu/linux-gcp-5.4<5.4.0-1030.32~18.04.1
5.4.0-1030.32~18.04.1
ubuntu/linux-gke-4.15<4.15.0-1074.79
4.15.0-1074.79
ubuntu/linux-gke-5.4<5.4.0-1030.32~18.04.1
5.4.0-1030.32~18.04.1
ubuntu/linux-gkeop-5.4<5.4.0-1005.6
5.4.0-1005.6
ubuntu/linux-hwe-5.4<5.4.0-56.62~18.04.1
5.4.0-56.62~18.04.1
ubuntu/linux-kvm<4.15.0-1079.81
4.15.0-1079.81
ubuntu/linux-oem<4.15.0-1103.114
4.15.0-1103.114
ubuntu/linux-oracle<4.15.0-1059.65
4.15.0-1059.65
ubuntu/linux-oracle-5.4<5.4.0-1030.32~18.04.1
5.4.0-1030.32~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1023.26~18.04.1
5.4.0-1023.26~18.04.1
ubuntu/linux-raspi2<4.15.0-1074.79
4.15.0-1074.79
ubuntu/linux-snapdragon<4.15.0-1091.100
4.15.0-1091.100
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-edge*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2031.32
4.15.0-2031.32
ubuntu/linux-azure-fips<4.15.0-2013.15
4.15.0-2013.15
ubuntu/linux-fips<4.15.0-1046.53
4.15.0-1046.53
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-56.62
5.4.0-56.62
ubuntu/linux-aws<5.4.0-1030.31
5.4.0-1030.31
ubuntu/linux-azure<5.4.0-1032.33
5.4.0-1032.33
ubuntu/linux-gcp<5.4.0-1030.32
5.4.0-1030.32
ubuntu/linux-kvm<5.4.0-1028.29
5.4.0-1028.29
ubuntu/linux-oem-5.6<5.6.0-1053.57
5.6.0-1053.57
ubuntu/linux-oracle<5.4.0-1030.32
5.4.0-1030.32
ubuntu/linux-raspi<5.4.0-1023.26
5.4.0-1023.26
ubuntu/linux-riscv<5.4.0-37.42
5.4.0-37.42
ubuntu/linux-raspi2*
ubuntu/linux-aws-fips<5.4.0-1069.73+fips2
5.4.0-1069.73+fips2
ubuntu/linux-azure-fips<5.4.0-1073.76+fips1
5.4.0-1073.76+fips1
ubuntu/linux-gcp-fips<5.4.0-1067.71~20.04.1
5.4.0-1067.71~20.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.21.1.rt56.1158.el7
  2. Upgrade

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

    Fixed in 0:3.10.0-1160.21.1.el7
  3. Upgrade

    Upgrade redhat/Linux kernel to a version that resolves this vulnerability.

    Fixed in 5.9
  4. Upgrade

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

    Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.22-1Fixed in 6.12.25-1
  5. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1082.86
  6. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1100.111~14.04.1
  7. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-197.229~14.04.1
  8. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-197.229
  9. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1118.132
  10. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1088.93~16.04.1
  11. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1100.111~16.04.1
  12. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1088.101~16.04.1
  13. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-126.129~16.04.1
  14. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1084.93
  15. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1059.65~16.04.1
  16. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1142.152
  17. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1146.156
  18. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1051.57
  19. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-126.129
  20. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1088.93
  21. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.31~18.04.1
  22. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1100.111
  23. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1032.33~18.04.1
  24. Upgrade

    Upgrade ubuntu/linux-dell300x to a version that resolves this vulnerability.

    Fixed in 4.15.0-1007.11
  25. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1088.101
  26. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.32~18.04.1
  27. Upgrade

    Upgrade ubuntu/linux-gke-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1074.79
  28. Upgrade

    Upgrade ubuntu/linux-gke-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.32~18.04.1
  29. Upgrade

    Upgrade ubuntu/linux-gkeop-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1005.6
  30. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-56.62~18.04.1
  31. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1079.81
  32. Upgrade

    Upgrade ubuntu/linux-oem to a version that resolves this vulnerability.

    Fixed in 4.15.0-1103.114
  33. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1059.65
  34. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.32~18.04.1
  35. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1023.26~18.04.1
  36. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1074.79
  37. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1091.100
  38. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2031.32
  39. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2013.15
  40. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1046.53
  41. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-56.62
  42. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.31
  43. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1032.33
  44. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.32
  45. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1028.29
  46. Upgrade

    Upgrade ubuntu/linux-oem-5.6 to a version that resolves this vulnerability.

    Fixed in 5.6.0-1053.57
  47. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1030.32
  48. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1023.26
  49. Upgrade

    Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.

    Fixed in 5.4.0-37.42
  50. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.73+fips2
  51. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1073.76+fips1
  52. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1067.71~20.04.1
  53. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 5.9-rc7
  54. Configuration

    Configure IPsec to encrypt all traffic between the endpoints instead of only the UDP port used by GENEVE tunnels.

    IPsec traffic selectors = all traffic between the GENEVE endpoints
  55. Configuration

    Blacklist the "geneve" kernel module so GENEVE tunnels remain disabled.

    geneve kernel module module blacklist = geneve
  56. Operational

    If GENEVE tunnels are not used, disable them by unloading the "geneve" kernel module.

Event History

Sep 16, 2020
CVE Published
12:00 AM
Oct 13, 2020
CVE Published
via MITRE·07:52 PM
Data Sourced
via MITRE·07:52 PM
DescriptionWeakness
Data Sourced
via OSV·08:15 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2020-25645?

CVE-2020-25645 has a high severity rating due to the potential for unencrypted traffic between Geneve endpoints.

2

How do I fix CVE-2020-25645?

To address CVE-2020-25645, you should upgrade to the Linux kernel version 5.9 or later.

3

Which versions of the Linux kernel are affected by CVE-2020-25645?

CVE-2020-25645 affects Linux kernel versions prior to 5.9-rc7.

4

What impact does CVE-2020-25645 have on network security?

CVE-2020-25645 could allow attackers to intercept and read unencrypted traffic between Geneve tunnel endpoints.

5

Is IPsec configuration sufficient to protect against CVE-2020-25645?

No, IPsec configuration may not provide adequate protection for traffic on specific UDP ports used by the GENEVE tunnel as per CVE-2020-25645.

Company

Resources

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