PT-2020-18839 · F5 · Big-Ip

Published 2020-11-05 · Updated 2020-11-16 · CVE-2020-5941

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions BIG-IP versions 15.1.0 through 15.1.0.5 BIG-IP versions 16.0.0 through 16.0.0.1

Description The issue occurs when using the RESOLV::lookup command within an iRule and data exceeding the maximum limit of a hostname is passed to it, causing the Traffic Management Microkernel (TMM) to generate a core file and restart.

Recommendations For BIG-IP versions 15.1.0 through 15.1.0.5, consider disabling the RESOLV::lookup command within iRules until a patch is available. For BIG-IP versions 16.0.0 through 16.0.0.1, consider disabling the RESOLV::lookup command within iRules until a patch is available. As a temporary workaround, restrict the amount of data passed to the RESOLV::lookup command to prevent it from exceeding the maximum limit of a hostname.

Fix

Related Identifiers

CVE-2020-5941

Affected Products

Big-Ip

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2020-5941 · Security Note
• https://osv.dev/vulnerability/CVE-2020-5941 · Vendor Advisory
• https://support.f5.com/csp/article/K03125360 · Vendor Advisory
• https://t.me/cibsecurity/15885 · Telegram Post