Updated symfony packages are available for both Debian GNU/Linux 9 and 10 to address multiple vulnerabilities which could lead to a timing attack/information leak

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Debian Security Advisory DSA-4573-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
November 18, 2019 https://www.debian.org/security/faq
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Package : symfony
CVE ID : CVE-2019-18887 CVE-2019-18888 CVE-2019-18889

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/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/