Impact: Moderate Public Date: 2019-09-02 CWE: CWE-331 Bugzilla: 1755523: CVE-2019-15847 gcc: POWER9 "DARN" RNG intrinsic produces repeated output 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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2019-15847 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 8 | gcc | Under investigation |
| Red Hat Enterprise Linux 8 | mingw-gcc | Under investigation |
| Red Hat Enterprise Linux 7 | gcc | Under investigation |
| Red Hat Enterprise Linux 6 | gcc | Under investigation |
| Red Hat Enterprise Linux 5 | gcc | Under investigation |
Vulmon