6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
51.0%
The version of PHP installed on the remote host is prior to 7.3.32. It is, therefore, affected by a vulnerability as referenced in the Version 7.3.32 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(154663);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id("CVE-2021-21703");
script_xref(name:"IAVA", value:"2021-A-0503-S");
script_name(english:"PHP 7.3.x < 7.3.32");
script_set_attribute(attribute:"synopsis", value:
"The version PHP running on the remote web server is affected by a vulnerability.");
script_set_attribute(attribute:"description", value:
"The version of PHP installed on the remote host is prior to 7.3.32. It is, therefore, affected by a vulnerability as
referenced in the Version 7.3.32 advisory.
- In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running
PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-
privileged users, it is possible for the child processes to access memory shared with the main process and
write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and
writes, which can be used to escalate privileges from local unprivileged user to the root user.
(CVE-2021-21703)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/81026");
script_set_attribute(attribute:"see_also", value:"http://php.net/ChangeLog-7.php#7.3.32");
script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 7.3.32 or later.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-21703");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/25");
script_set_attribute(attribute:"patch_publication_date", value:"2021/10/28");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/28");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:php:php");
script_set_attribute(attribute:"stig_severity", value:"I");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_set_attribute(attribute:"enable_cgi_scanning", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CGI abuses");
script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("php_version.nasl");
script_require_keys("www/PHP", "installed_sw/PHP");
script_exclude_keys("Settings/disable_cgi_scanning");
script_require_ports("Services/www", 80);
exit(0);
}
include('vcf.inc');
include('http.inc');
var port = get_http_port(default:80, php:TRUE);
var app_info = vcf::get_app_info(app:'PHP', port:port, webapp:TRUE);
var backported = get_kb_item('www/php/' + port + '/' + app_info.version + '/backported');
if ((report_paranoia < 2) && backported)
audit(AUDIT_BACKPORT_SERVICE, port, 'PHP ' + app_info.version + ' install');
var constraints = [
{ 'min_version' : '7.3.0alpha1', 'fixed_version' : '7.3.32' }
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
51.0%