PT-2021-4694 · F5 · Big-Ip

Published 2021-08-24 · Updated 2021-09-27 · CVE-2021-23034

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions BIG-IP versions 15.1.x through 15.1.3.0 BIG-IP versions 16.x through 16.0.x

Description The issue is related to the Traffic Management Microkernel (TMM) component of BIG-IP's access control and remote authentication system, which has inadequate boundary controls. This can be exploited by a remote attacker to cause a denial of service. When a DNS profile using a DNS cache resolver is configured on a virtual server, undisclosed requests can cause the TMM process to terminate.

Recommendations For BIG-IP versions 15.1.x through 15.1.3.0, update to version 15.1.3.1 or later to resolve the issue. For BIG-IP versions 16.x through 16.0.x, update to version 16.1.0 or later to resolve the issue. As a temporary workaround, consider disabling the DNS cache resolver on virtual servers until a patch is available.

Fix

RCE

Exposure of Resource to Wrong Sphere

Weakness Enumeration

CWE-688

CWE-20

CWE-668

Related Identifiers

BDU:2021-05396

CVE-2021-23034

Affected Products

Big-Ip

References · 6

• https://bdu.fstec.ru/vul/2021-05396 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-23034 · Security Note
• https://osv.dev/vulnerability/CVE-2021-23034 · Vendor Advisory
• https://support.f5.com/csp/article/K30523121 · Vendor Advisory
• https://t.me/cvenotify/21501 · Telegram Post
• https://t.me/cibsecurity/28840 · Telegram Post