Information Exposure Affecting kernel-rt-trace-devel package, versions <0:3.10.0-1160.11.1.rt56.1145.el7


Severity

high

    Threat Intelligence

    EPSS
    0.25% (65th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTTRACEDEVEL-2179136
  • published 26 Jul 2021
  • disclosed 22 Oct 2019

How to fix?

Upgrade Centos:7 kernel-rt-trace-devel to version 0:3.10.0-1160.11.1.rt56.1145.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-trace-devel package and not the kernel-rt-trace-devel package as distributed by Centos. See How to fix? for Centos:7 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.

CVSS Scores

version 3.1
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Snyk

5.3 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    None
  • Availability (A)
    None
Expand this section

NVD

5.3 medium
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Red Hat

5.3 medium