CVE-2019-18282

Description

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2

https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html

https://security.netapp.com/advisory/ntap-20200204-0002/

Details

Risk Information

CVSS v2

CVSS v3