CVE-2019-18282 — The flow_dissector feature in the Linux kernel 4
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)
Published
2020-01-16T15:22:58.000Z
Last modified
2024-08-05T01:47:14.161Z
01What is this vulnerability?
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…
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-01-16T15:22:58.000Z
- Last modified: 2024-08-05T01:47:14.161Z
09References
- cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5566…
- security.netapp.com — https://security.netapp.com/advisory/ntap-20200204-0002/
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
- www.computer.org — https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o
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