CVE-2017-11671

gcc: GCC generates incorrect code for RDRAND/RDSEED intrinsics

Severity Score

4.0

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Bajo ciertas circunstancias, la función ix86_expand_builtin en el archivo i386.c en GNU Compiler Collection (GCC) versiones 4.6, 4.7, 4.8, 4.9, versión 5 anterior a 5.5 y versión 6 anterior a 6.4, generará secuencias de instrucciones que marcarán el flag status de los intrínsecos RDRAND y RDSEED antes de que se pueda leer, es posible que no se denuncien los fallos de estas instrucciones. Esto podría potencialmente conllevar a una menor aleatoriedad en la generación de números aleatorios.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Local

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

2017-07-26 CVE Reserved
2017-07-26 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

CAPEC

References (7)

URL	Tag	Source
http://openwall.com/lists/oss-security/2017/07/27/2	Mailing List
http://www.securityfocus.com/bid/100018	Third Party Advisory
https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2018:0849	2018-04-12
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180	2018-04-12
https://access.redhat.com/security/cve/CVE-2017-11671	2018-04-10
https://bugzilla.redhat.com/show_bug.cgi?id=1475733	2018-04-10

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"				4.6 Search vendor "Gnu" for product "Gcc" and version "4.6"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				4.7 Search vendor "Gnu" for product "Gcc" and version "4.7"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				4.8 Search vendor "Gnu" for product "Gcc" and version "4.8"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				4.9 Search vendor "Gnu" for product "Gcc" and version "4.9"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				5.0 Search vendor "Gnu" for product "Gcc" and version "5.0"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				5.1 Search vendor "Gnu" for product "Gcc" and version "5.1"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				5.2 Search vendor "Gnu" for product "Gcc" and version "5.2"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				5.3 Search vendor "Gnu" for product "Gcc" and version "5.3"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				5.4 Search vendor "Gnu" for product "Gcc" and version "5.4"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				6.0 Search vendor "Gnu" for product "Gcc" and version "6.0"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				6.1 Search vendor "Gnu" for product "Gcc" and version "6.1"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				6.2 Search vendor "Gnu" for product "Gcc" and version "6.2"		-		Affected
Gnu Search vendor "Gnu"		Gcc Search vendor "Gnu" for product "Gcc"				6.3 Search vendor "Gnu" for product "Gcc" and version "6.3"		-		Affected