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Insufficient Entropy Affecting bpftool package, versions <0:3.10.0-1127.el7

Severity

 Recommended
medium

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.33% (72nd percentile)

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  • Snyk ID SNYK-CENTOS7-BPFTOOL-2152925
  • published 26 Jul 2021
  • disclosed 15 Jul 2019
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Introduced: 15 Jul 2019

CVE-2019-10638 Open this link in a new tab
CWE-331 Open this link in a new tab
CWE-200 Open this link in a new tab

How to fix?

Upgrade Centos:7 bpftool to version 0:3.10.0-1127.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bpftool package and not the bpftool package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

In the Linux kernel before 5.1.7, a device can be tracked by an attacker using the IP ID values the kernel produces for connection-less protocols (e.g., UDP and ICMP). When such traffic is sent to multiple destination IP addresses, it is possible to obtain hash collisions (of indices to the counter array) and thereby obtain the hashing key (via enumeration). An attack may be conducted by hosting a crafted web page that uses WebRTC or gQUIC to force UDP traffic to attacker-controlled IP addresses.

References