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TalosCVE-2019-5023

HistoryOct 31, 2019 - 9:15 p.m.

CVE-2019-5023

2019-10-3121:15:13

CWE-401

CWE-772

talos

web.nvd.nist.gov

cve-2019-5023

grsecurity

pax

patch

vulnerability

memory leakage

exploit

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

5.7

Confidence

High

EPSS

0.001

Percentile

45.3%

JSON

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.

Affected configurations

Nvd

Vulners

Node

opensrcsecgrsecurityRange3.1-4.9.8-201702060653–3.1-4.9.24-201704252333official

opensrcsecgrsecurityRange4.9.25–4.9.74unofficial

opensrcsecpaxRangepax-linux-4.9.8-test1–pax-linux-4.9.8-test7

VendorProductVersionCPE
opensrcsecgrsecurity*cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:official:*:*:*
opensrcsecgrsecurity*cpe:2.3:a:opensrcsec:grsecurity:*:*:*:*:unofficial:*:*:*
opensrcsecpax*cpe:2.3:a:opensrcsec:pax:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
opensrcsec	grsecurity	*	cpe:2.3:a:opensrcsec:grsecurity:::::official:::*
opensrcsec	grsecurity	*	cpe:2.3:a:opensrcsec:grsecurity:::::unofficial:::*
opensrcsec	pax	*	cpe:2.3:a:opensrcsec:pax::::::::

CNA Affected

[
  {
    "product": "PaX",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "PaX pax-linux-4.9.24-test7.patch (latest version available to the public) grsecurity grsecurity-3.1-4.9.24-201704252333.patch (latest official version available to the public) v4.9.74-unofficial_grsec (latest unofficial version available to the public)"
      }
    ]
  }
]

References

talosintelligence.com/vulnerability_reports/TALOS-2019-0784

Social References

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

AI Score

5.7

Confidence

High

EPSS

0.001

Percentile

45.3%

JSON

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