CVE-2019-18282

moderate-risk
Published 2020-01-16

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.

Do I need to act?

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0.68% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (14)

8300 Firmware
8700 Firmware
A400 Firmware

Affected Vendors

Debian Linux Netapp

References (10)

Mailing List https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5566...
Mailing List https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200204-0002/
Third Party Advisory https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o
Mailing List https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10
Mailing List https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5566...
Mailing List https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200204-0002/
Third Party Advisory https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o
41
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 2/34 · Minimal
Exposure 18/34 · Moderate