What it is about

Red Hat Enterprise Linux (RHEL) ist eine populäre Linux-Distribution. Ein lokaler Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux in libxslt ausnutzen, um einen Denial of Service zu verursachen beliebigen Programmcode auszuführen.

Under what conditions?

Only with access to the device or an account on it. Often the second step after a phishing email.

What can happen in the worst case

An attacker could use the vulnerability to

• einen Denial of Service zu verursachen beliebigen Programmcode auszuführen

Am I affected?

Affected according to the BSI:

• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• IBM App Connect Enterprise
• Xerox FreeFlow Print Server v7
• NetApp Data ONTAP 9
• Red Hat Enterprise Linux <9
• Red Hat Enterprise Linux <8
• Red Hat Enterprise Linux <9.4 Extended Update Support
• Red Hat Enterprise Linux <9.2 Extended Update Support
• Red Hat Enterprise Linux <7 Extended Lifecycle Support

and 24 more

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

What helps?

Update to at least:

• Red Hat Enterprise Linux 9
• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 9.4 Extended Update Support
• Red Hat Enterprise Linux 9.2 Extended Update Support
• Red Hat Enterprise Linux 7 Extended Lifecycle Support
• Red Hat Enterprise Linux 8.2 Advanced Update Support
• Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
• Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
• Red Hat Enterprise Linux 8.4 Telecommunications Update Service
• Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
• Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
• Red Hat Enterprise Linux 8.6 Telecommunications Update Service

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.