Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) Affecting libgfortran package, versions <0:4.8.5-28.el7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published26 Jul 2021
- disclosed25 Mar 2017
Introduced: 25 Mar 2017
CVE-2017-11671 (opens in a new tab)How to fix?
Upgrade Centos:7 libgfortran to version 0:4.8.5-28.el7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libgfortran package and not the libgfortran package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.
References
- http://www.securityfocus.com/bid/100018
- http://openwall.com/lists/oss-security/2017/07/27/2
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180
- https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html
- https://access.redhat.com/security/cve/CVE-2017-11671
- https://access.redhat.com/errata/RHSA-2018:0849