CVE-2021-21431

Description

sopel-channelmgnt is a channelmgnt plugin for sopel. In versions prior to 2.0.1, on some IRC servers, restrictions around the removal of the bot using the kick/kickban command could be bypassed when kicking multiple users at once. We also believe it may have been possible to remove users from other channels but due to the wonder that is IRC and following RfCs, We have no POC for that. Freenode is not affected. This is fixed in version 2.0.1. As a workaround, do not use this plugin on networks where TARGMAX > 1.

How to fix CVE-2021-21431

To remediate CVE-2021-21431, upgrade the affected package to a fixed version below.

• —upgrade to 2.0.1 or later
• —upgrade to 7c96d400358221e59135f0a0be0744f3fad73856 or later

Is CVE-2021-21431 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2.0.1
• from 0, < 7c96d400358221e59135f0a0be0744f3fad73856 | from 0, < 2.0.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21431
• PATCHgithub.com/MirahezeBots/sopel-channelmgnt
• PATCHpypi.org/project/sopel-plugins.channelmgnt/
• WEBgithub.com/MirahezeBots/sopel-channelmgnt/commit/643388365f28c5cc682254ab913c401f0e53260a