PT-2019-17775 · Freebsd · Freebsd

Published 2019-07-24 · Updated 2023-02-01 · CVE-2019-5606

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions FreeBSD versions 11.2-RELEASE through 11.2-RELEASE-p11 FreeBSD versions 11.3-RELEASE through 11.3-RELEASE-p0 FreeBSD versions 12.0-RELEASE through 12.0-RELEASE-p7

Description The issue arises from the handling of the close of a descriptor created by posix openpt, which fails to undo a signal configuration. This results in an incorrect signal being raised, leading to a write after free of kernel memory. A malicious user can exploit this to gain root privileges or escape a jail.

Recommendations For FreeBSD versions 11.2-RELEASE through 11.2-RELEASE-p11, update to 11.2-RELEASE-p12 or later. For FreeBSD versions 11.3-RELEASE through 11.3-RELEASE-p0, update to 11.3-RELEASE-p1 or later. For FreeBSD versions 12.0-RELEASE through 12.0-RELEASE-p7, update to 12.0-RELEASE-p8 or later.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2019-5606

FREEBSD-SA-19_13

Affected Products

Freebsd

References · 5

• https://osv.dev/vulnerability/CVE-2019-5606 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-5606 · Security Note
• https://security.freebsd.org/advisories/FreeBSD-SA-19:13.pts.asc · Vendor Advisory
• https://security.netapp.com/advisory/ntap-20190814-0003 · Note
• http://packetstormsecurity.com/files/153748/FreeBSD-Security-Advisory-FreeBSD-SA-19-13.pts.html · Note