Debian 9: DLA-2629-1 Critical: Libebml Heap Overflow Threat

A heap overflow issue was detected in libebml, a library to read and
write files in the EBML format, a binary pendant to XML.
These issues appeared in several ReadData functions of various data type
classes. This update also fixes the issue in EbmlString::ReadData and
EbmlUnicodeString::ReadData, which were mentioned in CVE-2021-3405.


For Debian 9 stretch, this problem has been fixed in version
1.3.4-1+deb9u2.

We recommend that you upgrade your libebml packages.

For the detailed security status of libebml please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libebml

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS