Add a security advisory for gst-plugins-base

docs/advisories/2024-12-24.md

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+Security Advisory 2024-12-24
+
+In Dangerzone, a security vulnerability was detected in the quarantined
+environment where documents are opened. Vulnerabilities like this are expected
+and do not compromise the security of Dangerzone. However, in combination with
+another more serious vulnerability (also called container escape), a malicious
+document may be able to breach the security of Dangerzone. We are not aware of
+any container escapes that affect Dangerzone. **To reduce that risk, you are
+strongly advised to update Dangerzone to the latest version**.
+
+# Summary
+
+A series of vulnerabilities in gst-plugins-base (CVE-2024-47538, CVE-2024-47607
+and CVE-2024-47615) affects the **contained** environment where the document
+rendering takes place.
+
+If one attempts to convert a malicious file with an embedded Vorbis or Opus
+media elements,  arbitrary code may run within that environment. Such files
+look like regular Office documents, which means that you cannot avoid a specific
+extension. Other programs that open Office documents, such as LibreOffice, are
+also affected, unless the system has been upgraded in the meantime.
+
+# How does this impact me?
+
+The expectation is that malicious code will run in a container without Internet
+access, meaning that it won't be able to infect the rest of the system.
+
+If you are running Dangerzone via the Qubes OS, you are not impacted.
+
+# What do I need to do?
+
+You are **strongly** advised to update your Dangerzone installation to 0.8.1 as
+soon as possible.