CVE-2019-18282

medium

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

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

https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o

Details

Source: MITRE

Published: 2020-01-16

Updated: 2022-04-18

Type: CWE-330

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Impact Score: 1.4

Exploitability Score: 3.9

Severity: MEDIUM