CVE-2020-1749

Published: 4 March 2020

A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

From the Ubuntu Security Team

Xiumei Mu discovered that the IPSec implementation in the Linux kernel did not properly encrypt IPv6 traffic in some situations. An attacker could use this to expose sensitive information.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-106.107)
	eoan	Released (5.3.0-40.32)
	focal	Not vulnerable (5.4.0-18.22)
	trusty	Ignored (was needs-triage ESM criteria)
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-184.214)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 6c8991f41546c3c472503dff1ea9daaddf9331c2
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1073.77)
	eoan	Released (5.3.0-1011.12)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Released (4.4.0-1073.77) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1109.120)
linux-aws-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needed)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-aws-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1016.17~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1073.77~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needed)
	eoan	Released (5.3.0-1013.14)
	focal	Not vulnerable (5.4.0-1006.6)
	trusty	Released (4.15.0-1089.99~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1089.99~16.04.1)
linux-azure-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1089.99)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-azure-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1013.14~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needed)
	eoan	Released (5.3.0-1012.13)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1077.87~16.04.1)
linux-gcp-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1077.87)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gcp-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1012.13~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gke-4.15 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1063.66)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gke-5.0 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1042.43)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-gke-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1012.13~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-40.32~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-106.107~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needs-triage)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Ignored (end of life, was needs-triage)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1067.68)
	eoan	Released (5.3.0-1010.11)
	focal	Not vulnerable (5.4.0-1004.4)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1075.82)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Does not exist
	trusty	Released (4.4.0-184.214~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1087.97)
	eoan	Ignored (end of life)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Ignored (end of standard support, was needs-triage)
linux-oem-5.6 Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.6.0-1007.7)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oem-osp1 Launchpad, Ubuntu, Debian	bionic	Released (5.0.0-1059.64)
	eoan	Ignored (end of life)
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1045.49)
	eoan	Released (5.3.0-1009.10)
	focal	Not vulnerable (5.4.0-1005.5)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.15.0-1045.49~16.04.1)
linux-oracle-5.0 Launchpad, Ubuntu, Debian	bionic	Ignored (end of life, was needed)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-oracle-5.3 Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.3.0-1011.12~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-raspi Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.4.0-1007.7)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1063.67)
	eoan	Released (5.3.0-1018.20)
	focal	Not vulnerable (5.4.0-1004.4)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1134.143)
linux-raspi2-5.3 Launchpad, Ubuntu, Debian	bionic	Released (5.3.0-1018.20~18.04.1)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-riscv Launchpad, Ubuntu, Debian	bionic	Does not exist
	eoan	Does not exist
	focal	Not vulnerable (5.4.0-24.28)
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Does not exist
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1080.87)
	eoan	Does not exist
	focal	Does not exist
	trusty	Does not exist
	upstream	Released (5.5~rc1)
	xenial	Released (4.4.0-1138.146)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

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