CVE-2019-5023

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.

CVSS v3 5.9 MEDIUM
CVSS v2.0 4.3 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

4.3^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:N/I:N/A:P

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784	Exploit Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:opensrcsec:grsecurity:::::official:::*
	cpe:2.3:a:opensrcsec:grsecurity:::::unofficial:::*
	cpe:2.3:a:opensrcsec:pax::::::::

History

21 Nov 2024, 04:44

Type	Values Removed	Values Added
References	~~() https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784 - Exploit, Third Party Advisory~~	() https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784 - Exploit, Third Party Advisory

Information

Published : 2019-10-31 21:15

Updated : 2024-11-21 04:44

NVD link : CVE-2019-5023

Mitre link : CVE-2019-5023

CVE.ORG link : CVE-2019-5023

JSON object : View

Products Affected

opensrcsec

grsecurity
pax

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

CWE-772

Missing Release of Resource after Effective Lifetime

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