Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2019-5023

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
31/10/2019
Last modified:
07/06/2022

Description

An exploitable vulnerability exists in the grsecurity PaX patch for the function read_kmem, in PaX from version pax-linux-4.9.8-test1 to 4.9.24-test7, grsecurity official from version grsecurity-3.1-4.9.8-201702060653 to grsecurity-3.1-4.9.24-201704252333, grsecurity unofficial from version v4.9.25-unofficialgrsec to v4.9.74-unofficialgrsec. PaX adds a temp buffer to the read_kmem function, which is never freed when an invalid address is supplied. This results in a memory leakage that can lead to a crash of the system. An attacker needs to induce a read to /dev/kmem using an invalid address to exploit this vulnerability.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.90
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:M/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
4.30
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:official:*:*:* 3.1-4.9.8-201702060653 (including) 3.1-4.9.24-201704252333 (including)
cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:unofficial:*:*:* 4.9.25 (including) 4.9.74 (including)
cpe:2.3:a:opensrcsec:pax:*:*:*:*:*:*:*:* pax-linux-4.9.8-test1 (including) pax-linux-4.9.8-test7 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools