=========================================================================Ubuntu Security Notice USN-5905-1
March 02, 2023

php7.0 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in PHP.

Software Description:
- php7.0: HTML-embedded scripting language interpreter

Details:

It was discovered that PHP incorrectly handled certain gzip files.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2022-31628)

It was discovered that PHP incorrectly handled certain cookies.
An attacker could possibly use this issue to compromise data integrity.
(CVE-2022-31629)

It was discovered that PHP incorrectly handled certain inputs.
An attacker could possibly use this issue to cause a crash or
execute arbitrary code. (CVE-2022-31631)

It was discovered that PHP incorrectly handled resolving long paths. A
remote attacker could possibly use this issue to obtain or modify sensitive
information. (CVE-2023-0568)

It was discovered that PHP incorrectly handled a large number of field 
and file
parts in HTTP form uploads. A remote attacker could possibly use this 
issue to
cause PHP to consume resources, leading to a denial of service. 
(CVE-2023-0662)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
   libapache2-mod-php7.0           7.0.33-0ubuntu0.16.04.16+esm5
   php7.0 7.0.33-0ubuntu0.16.04.16+esm5
   php7.0-cgi 7.0.33-0ubuntu0.16.04.16+esm5
   php7.0-cli 7.0.33-0ubuntu0.16.04.16+esm5
   php7.0-fpm 7.0.33-0ubuntu0.16.04.16+esm5
   php7.0-sqlite3 7.0.33-0ubuntu0.16.04.16+esm5
   php7.0-zip 7.0.33-0ubuntu0.16.04.16+esm5

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5905-1 

   CVE-2022-31628, CVE-2022-31629, CVE-2022-31631, CVE-2023-0568,
   CVE-2023-0662