Debian: DSA-4573-1 Moderate: Symfony Timing Attack and Code Exec

Multiple vulnerabilities have been found in the Symfony PHP framework
which could lead to a timing attack/information leak, argument injection
and code execution via unserialization.

For the oldstable distribution (stretch), these problems have been fixed
in version 2.8.7+dfsg-1.3+deb9u3.

For the stable distribution (buster), these problems have been fixed in
version 3.4.22+dfsg-2+deb10u1.

We recommend that you upgrade your symfony packages.

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

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