Vulnerability Details : 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.
Products affected by CVE-2019-5023
- Opensrcsec » Grsecurity » Unofficial EditionVersions from including (>=) 4.9.25 and up to, including, (<=) 4.9.74cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:unofficial:*:*:*
- Opensrcsec » Grsecurity » Official EditionVersions from including (>=) 3.1-4.9.8-201702060653 and up to, including, (<=) 3.1-4.9.24-201704252333cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:official:*:*:*
- Opensrcsec » PAXVersions from including (>=) pax-linux-4.9.8-test1 and up to, including, (<=) pax-linux-4.9.8-test7cpe:2.3:a:opensrcsec:pax:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-5023
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 44 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-5023
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:N/A:P |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
1.4
|
4.0
|
Talos | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2019-5023
-
The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.Assigned by: talos-cna@cisco.com (Secondary)
-
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-5023
-
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784
TALOS-2019-0784 || Cisco Talos Intelligence Group - Comprehensive Threat IntelligenceExploit;Third Party Advisory
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