The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5300-1 advisory.

  - An issue was discovered in PHP 7.3.x before 7.3.0alpha3, 7.2.x before 7.2.8, and before 7.1.20. The php-     fpm master process restarts a child process in an endless loop when using program execution functions     (e.g., passthru, exec, shell_exec, or system) with a non-blocking STDIN stream, causing this master     process to consume 100% of the CPU, and consume disk space with a large volume of error logs, as     demonstrated by an attack by a customer of a shared-hosting facility. (CVE-2015-9253)

  - The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to     string objects that result in a negative length, which allows remote attackers to cause a denial of     service (application crash) or possibly have unspecified other impact by leveraging a script's use of .=     with a long string. (CVE-2017-8923)

  - PHP 7.1.5 has an Out of bounds access in php_pcre_replace_impl via a crafted preg_replace call.
    (CVE-2017-9118)

  - The i_zval_ptr_dtor function in Zend/zend_variables.h in PHP 7.1.5 allows attackers to cause a denial of     service (memory consumption and application crash) or possibly have unspecified other impact by triggering     crafted operations on array data structures. (CVE-2017-9119)

  - PHP 7.x through 7.1.5 allows remote attackers to cause a denial of service (buffer overflow and     application crash) or possibly have unspecified other impact via a long string because of an Integer     overflow in mysqli_real_escape_string. (CVE-2017-9120)

  - In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing     functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains     URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus     interpreting the filename differently from what the user intended, which may lead it to reading a     different file than intended. (CVE-2021-21707)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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Ubuntu 16.04 ESM : PHP vulnerabilities (USN-5300-1)

critical Nessus Plugin ID 158273

Version 1.4