CVE-2019-5023
Last modified
CVE-2019-5023 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 0.74% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Opensrcsec | Grsecurity | >= 3.1-4.9.8-201702060653, <= 3.1-4.9.24-201704252333 |
| Opensrcsec | Grsecurity | >= 4.9.25, <= 4.9.74 |
| Opensrcsec | Pax | >= pax-linux-4.9.8-test1, <= pax-linux-4.9.8-test7 |
References
- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784Exploit, Third Party Advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0784Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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