Vulnerability Details : CVE-2019-15847
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.
Products affected by CVE-2019-15847
- cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-15847
0.49%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 63 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-15847
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:N |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2019-15847
-
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-15847
-
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
91481 – (CVE-2019-15847) POWER9 "DARN" RNG intrinsic produces repeated output (CVE-2019-15847)Issue Tracking;Vendor Advisory
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http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
[security-announce] openSUSE-SU-2019:2364-1: moderate: Security update fMailing List;Third Party Advisory
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http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
[security-announce] openSUSE-SU-2019:2365-1: moderate: Security update fMailing List;Third Party Advisory
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http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
[security-announce] openSUSE-SU-2020:0716-1: moderate: Security update fMailing List;Third Party Advisory
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