IM
IronMonkey Threat Research

CVE-2019-19126 LOW

Published: 2019-11-19 | Last Modified: 2024-11-21 | Status: Modified

Description

On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.

Additional Descriptions (1)

En la arquitectura de x86-64, la Biblioteca GNU C (también se conoce como glibc) versiones anteriores a 2.31 no omite la variable de entorno de LD_PREFER_MAP_32BIT_EXEC durante la ejecución del programa después de una transición de seguridad, permitiendo a atacantes locales restringir las posibles direcciones de mapeo para las bibliotecas cargadas y así omitir ASLR para un programa setuid

CVSS Metrics

Base Score: 3.3 (LOW)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactLOW
Integrity ImpactNONE
Availability ImpactNONE

Source: [email protected]

Type: Primary

Exploitability Score: 1.8

Impact Score: 1.4

Base Score: 2.1 (LOW)

AV:L/AC:L/Au:N/C:P/I:N/A:N

Access VectorLOCAL
Access ComplexityLOW
AuthenticationNONE
Confidentiality ImpactPARTIAL
Integrity ImpactNONE
Availability ImpactNONE

Source: [email protected]

Type: Primary

Exploitability Score: 3.9

Impact Score: 2.9

Weaknesses

Source Type Description
[email protected] Primary
en CWE-665

Affected Products

Vendor Product Version Update Type
gnu glibc * <built-in method update of dict object at 0x7fd3841f1dc0> Application
canonical ubuntu_linux 16.04 <built-in method update of dict object at 0x7fd36b7d5180> Operating System
canonical ubuntu_linux 18.04 <built-in method update of dict object at 0x7fd36b7d4200> Operating System
canonical ubuntu_linux 19.10 <built-in method update of dict object at 0x7fd36b7d4340> Operating System
fedoraproject fedora 30 <built-in method update of dict object at 0x7fd3841f0580> Operating System
fedoraproject fedora 31 <built-in method update of dict object at 0x7fd3841f3c00> Operating System
debian debian_linux 10.0 <built-in method update of dict object at 0x7fd368d820c0> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:x64:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Yes cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
Yes cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References