CVE-2019-15847

gcc: POWER9 "DARN" RNG intrinsic produces repeated output

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

El backend POWER9 en GNU Compiler Collection (GCC) en versiones anteriores a la 10 podría optimizar múltiples llamadas de __builtin_darn intrínsecas en una sola llamada, reduciendo así la entropía del generador de números aleatorios. Esto ocurrió porque no se especificó una operación volátil. Por ejemplo, dentro de una sola ejecución de un programa, la salida de cada llamada __builtin_darn() puede ser la misma.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-09-02 CVE Reserved
2019-09-02 CVE Published
2024-08-05 CVE Updated
2024-08-26 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-331: Insufficient Entropy

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00056.html	2020-09-17
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00057.html	2020-09-17
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00058.html	2020-09-17
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481	2020-09-17
https://access.redhat.com/security/cve/CVE-2019-15847	2020-05-26
https://bugzilla.redhat.com/show_bug.cgi?id=1755523	2020-05-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				< 7.5.0 Search vendor "Gnu" for product "Gcc" and version " < 7.5.0"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				>= 8.0 < 8.4.0 Search vendor "Gnu" for product "Gcc" and version " >= 8.0 < 8.4.0"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				>= 9.0 < 9.3.0 Search vendor "Gnu" for product "Gcc" and version " >= 9.0 < 9.3.0"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				>= 10.0 < 10.1.0 Search vendor "Gnu" for product "Gcc" and version " >= 10.0 < 10.1.0"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.0 Search vendor "Opensuse" for product "Leap" and version "15.0"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected