Overview
- 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.
- Source
- talos-cna@cisco.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 5.9
- Impact score
- 3.6
- Exploitability score
- 2.2
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- MEDIUM
CVSS 3.0
- Type
- Secondary
- Base score
- 5.9
- Impact score
- 4
- Exploitability score
- 1.4
- Vector string
- CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
- Severity
- MEDIUM
CVSS 2.0
- Type
- Primary
- Base score
- 4.3
- Impact score
- 2.9
- Exploitability score
- 8.6
- Vector string
- AV:N/AC:M/Au:N/C:N/I:N/A:P
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:official:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D949E9AD-ECE0-4C9D-B2BD-4091D957EBB1",
"versionEndIncluding": "3.1-4.9.24-201704252333",
"versionStartIncluding": "3.1-4.9.8-201702060653"
},
{
"criteria": "cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:unofficial:*:*:*",
"vulnerable": true,
"matchCriteriaId": "187DBEE6-4986-41C1-8735-38EEF94A3108",
"versionEndIncluding": "4.9.74",
"versionStartIncluding": "4.9.25"
},
{
"criteria": "cpe:2.3:a:opensrcsec:pax:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "319F79C1-0EA7-44F5-8837-FC4A146AB160",
"versionEndIncluding": "pax-linux-4.9.8-test7",
"versionStartIncluding": "pax-linux-4.9.8-test1"
}
],
"operator": "OR"
}
]
}
]