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
7.2 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
51.1%
The version of PHP installed on the remote host is prior to 8.1.0. It is, therefore, affected by multiple vulnerabilities as referenced in the Version 8.1.0 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)
In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS permissions. (CVE-2021-21706)
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.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(155730);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id("CVE-2021-21703", "CVE-2021-21706", "CVE-2021-21707");
script_xref(name:"IAVA", value:"2021-A-0503-S");
script_xref(name:"IAVA", value:"2021-A-0566-S");
script_name(english:"PHP 8.1.x < 8.1.0 Multiple Vulnerabilities");
script_set_attribute(attribute:"synopsis", value:
"The version PHP running on the remote web server is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of PHP installed on the remote host is prior to 8.1.0. It is, therefore, affected by multiple
vulnerabilities as referenced in the Version 8.1.0 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)
- In PHP versions 7.3.x below 7.3.31, 7.4.x below 7.4.24 and 8.0.x below 8.0.11, in Microsoft Windows
environment, ZipArchive::extractTo may be tricked into writing a file outside target directory when
extracting a ZIP file, thus potentially causing files to be created or overwritten, subject to OS
permissions. (CVE-2021-21706)
- 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.");
script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/79971");
script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/81026");
script_set_attribute(attribute:"see_also", value:"http://bugs.php.net/81420");
script_set_attribute(attribute:"see_also", value:"http://php.net/ChangeLog-8.php#8.1.0");
script_set_attribute(attribute:"solution", value:
"Upgrade to PHP version 8.1.0 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:F/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:F/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:"2021/10/04");
script_set_attribute(attribute:"patch_publication_date", value:"2021/11/25");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/30");
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' : '8.1.0alpha1', 'fixed_version' : '8.1.0' }
];
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
7.2 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
51.1%