Information Exposure Affecting kernel-cross-headers package, versions <0:4.18.0-193.el8
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Test your applications- Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-3738143
- published 26 Jul 2021
- disclosed 22 Oct 2019
Introduced: 22 Oct 2019
CVE-2019-18282 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-cross-headers to version 0:4.18.0-193.el8 or higher.
This issue was patched in RHSA-2020:1769.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2
- https://security.netapp.com/advisory/ntap-20200204-0002/
- https://access.redhat.com/security/cve/CVE-2019-18282
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.10
- https://www.computer.org/csdl/proceedings-article/sp/2020/349700b594/1j2LgrHDR2o
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
- https://access.redhat.com/errata/RHSA-2020:1769