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

Medium

CVSS 3 base score: 7.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1749
• https://access.redhat.com/security/cve/CVE-2020-1749
• https://bugzilla.redhat.com/show_bug.cgi?id=1809833
• https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=6c8991f41546
• https://ubuntu.com/security/notices/USN-4391-1
• https://ubuntu.com/security/notices/USN-4390-1
• https://ubuntu.com/security/notices/USN-4388-1
• NVD
• Launchpad
• Debian