Insufficient Entropy Affecting libstdc++ package, versions <0:8.3.1-5.el8


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.25% (66th percentile)

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  • Snyk IDSNYK-RHEL8-LIBSTDC-3743069
  • published26 Jul 2021
  • disclosed2 Sept 2019

Introduced: 2 Sep 2019

CVE-2019-15847  (opens in a new tab)
CWE-331  (opens in a new tab)

How to fix?

Upgrade RHEL:8 libstdc++ to version 0:8.3.1-5.el8 or higher.
This issue was patched in RHSA-2020:1864.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libstdc++ package and not the libstdc++ package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize multiple calls of the __builtin_darn intrinsic into a single call, thus reducing the entropy of the random number generator. This occurred because a volatile operation was not specified. For example, within a single execution of a program, the output of every __builtin_darn() call may be the same.

CVSS Scores

version 3.1