What it is about

Netty ist ein asynchrones, ereignisgesteuertes Netzwerk-Anwendungs-Framework für die schnelle Entwicklung von wartbaren, hochleistungsfähigen Protokollservern und -clients. Ein Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und um Daten zu manipulieren.

Under what conditions?

The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.

What can happen in the worst case

An attacker could use the vulnerability to

• Sicherheitsvorkehrungen zu umgehen
• Daten zu manipulieren

Am I affected?

Affected according to the BSI:

• IBM DB2
• Red Hat Enterprise Linux
• IBM License Metric Tool
• SUSE Linux
• Open Source Netty <4.2.16.Final
• Open Source Netty <4.1.136.Final
• IBM App Connect Enterprise for Manufactoring
• IBM SPSS Analytic Server

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

• Open Source Netty 4.2.16.Final
• Open Source Netty 4.1.136.Final

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.