A php7.0 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities.

DLA 2708-1: php7.0 security update

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Debian LTS Advisory DLA-2708-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
July 15, 2021   https://wiki.debian.org/LTS
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Package : php7.0
Version : 7.0.33-0+deb9u11
CVE ID : CVE-2019-18218 CVE-2020-7071 CVE-2021-21702 CVE-2021-21704
CVE-2021-21705
Debian Bug : 942830 990575

Several vulnerabilities were discovered in php5, a server-side,
HTML-embedded scripting language. An attacker could cause denial of
service (DoS), memory corruption and potentially execution of
arbitrary code, and server-side request forgery (SSRF) bypass.

CVE-2019-18218

fileinfo: cdf_read_property_info in cdf.c does not restrict the
number of CDF_VECTOR elements, which allows a heap-based buffer
overflow (4-byte out-of-bounds write).

CVE-2020-7071

When validating URL with functions like filter_var($url,
FILTER_VALIDATE_URL), PHP will accept an URL with invalid password
as valid URL. This may lead to functions that rely on URL being
valid to mis-parse the URL and produce wrong data as components of
the URL.

CVE-2021-21702

When using SOAP extension to connect to a SOAP server, a malicious
SOAP server could return malformed XML data as a response that
would cause PHP to access a null pointer and thus cause a crash.

CVE-2021-21704

Multiple firebird issues.

CVE-2021-21705

SSRF bypass in FILTER_VALIDATE_URL.

For Debian 9 stretch, these problems have been fixed in version
7.0.33-0+deb9u11.

We recommend that you upgrade your php7.0 packages.

For the detailed security status of php7.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/php7.0

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