High severity · published Sep 2, 2019
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…
7.5
CVSS
3.2%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.2% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GC
Gcc · Gnu
before 7.5.0; 8.0 before 8.4.0; 9.0 before 9.3.0; 10.0 before 10.1.0 · source: NVD
LE
Leap · Opensuse
15.0; 15.1 · source: NVD
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5; V3.1.0 before V3.1.5 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.0 before V3.1.5 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-15847
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-15847
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html
Issue Tracking
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
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