FreeBSD 11.2/11.3/12.0 Signal Kernel Memory use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.1$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in FreeBSD 11.2/11.3/12.0. This issue affects some unknown processing of the component Signal Handler. This manipulation causes use after free (Kernel Memory). This vulnerability is registered as CVE-2019-5606. The attack needs to be launched locally. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical was found in FreeBSD 11.2/11.3/12.0 (Operating System). Affected by this vulnerability is an unknown code of the component Signal Handler. The manipulation with an unknown input leads to a use after free vulnerability (Kernel Memory). The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In FreeBSD 12.0-STABLE before r349805, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r349806, 11.3-RELEASE before 11.3-RELEASE-p1, and 11.2-RELEASE before 11.2-RELEASE-p12, code which handles close of a descriptor created by posix_openpt fails to undo a signal configuration. This causes an incorrect signal to be raised leading to a write after free of kernel memory allowing a malicious user to gain root privileges or escape a jail.

The weakness was published 07/26/2019 (Website). It is possible to read the advisory at security.FreeBSD.org. This vulnerability is known as CVE-2019-5606 since 01/07/2019. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

Applying a patch is able to eliminate this problem.

Similar entries are available at VDB-138833, VDB-138834 and VDB-138836. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.3
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Use after free / Kernel Memory
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/07/2019 🔍
07/26/2019 +200 days 🔍
07/26/2019 +0 days 🔍
11/13/2023 +1571 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: 153748
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-5606 (🔍)
GCVE (CVE): GCVE-0-2019-5606
GCVE (VulDB): GCVE-100-138835
See also: 🔍

Entryinfo

Created: 07/26/2019 08:03
Updated: 11/13/2023 08:39
Changes: 07/26/2019 08:03 (57), 07/12/2020 18:15 (1), 11/13/2023 08:39 (4)
Complete: 🔍
Cache ID: 216::103

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