The flow_dissector feature in the Linux kernel 4.3 through 5.x...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
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
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Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.