6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 High
AI Score
Confidence
Low
0.003 Low
EPSS
Percentile
71.2%
The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5082 advisory.
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)
In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
(CVE-2021-21708)
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.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-5082. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(158202);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/07");
script_cve_id("CVE-2021-21707", "CVE-2021-21708");
script_xref(name:"IAVA", value:"2021-A-0566-S");
script_name(english:"Debian DSA-5082-1 : php7.4 - security update");
script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-5082 advisory.
- 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)
- In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions
with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to
trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of
other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
(CVE-2021-21708)
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:"https://security-tracker.debian.org/tracker/source-package/php7.4");
script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2022/dsa-5082");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-21707");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-21708");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/php7.4");
script_set_attribute(attribute:"solution", value:
"Upgrade the php7.4 packages.
For the stable distribution (bullseye), these problems have been fixed in version 7.4.28-1+deb11u1.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2021-21708");
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:"2021/11/29");
script_set_attribute(attribute:"patch_publication_date", value:"2022/02/18");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/21");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libapache2-mod-php7.4");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libphp7.4-embed");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-bcmath");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-bz2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-cgi");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-cli");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-curl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-dba");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-enchant");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-fpm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-gd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-gmp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-imap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-interbase");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-intl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-json");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-mbstring");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-mysql");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-odbc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-opcache");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-pgsql");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-phpdbg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-pspell");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-readline");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-snmp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-soap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-sqlite3");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-sybase");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-tidy");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-xml");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-xmlrpc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-xsl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php7.4-zip");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Debian Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include('audit.inc');
include('debian_package.inc');
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
var release = get_kb_item('Host/Debian/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Debian');
var release = chomp(release);
if (! preg(pattern:"^(11)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);
var pkgs = [
{'release': '11.0', 'prefix': 'libapache2-mod-php7.4', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'libphp7.4-embed', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-bcmath', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-bz2', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-cgi', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-cli', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-common', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-curl', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-dba', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-dev', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-enchant', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-fpm', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-gd', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-gmp', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-imap', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-interbase', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-intl', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-json', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-ldap', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-mbstring', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-mysql', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-odbc', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-opcache', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-pgsql', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-phpdbg', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-pspell', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-readline', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-snmp', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-soap', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-sqlite3', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-sybase', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-tidy', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-xml', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-xmlrpc', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-xsl', 'reference': '7.4.28-1+deb11u1'},
{'release': '11.0', 'prefix': 'php7.4-zip', 'reference': '7.4.28-1+deb11u1'}
];
var flag = 0;
foreach package_array ( pkgs ) {
var release = NULL;
var prefix = NULL;
var reference = NULL;
if (!empty_or_null(package_array['release'])) release = package_array['release'];
if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (release && prefix && reference) {
if (deb_check(release:release, prefix:prefix, reference:reference)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : deb_report_get()
);
exit(0);
}
else
{
var tested = deb_pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libapache2-mod-php7.4 / libphp7.4-embed / php7.4 / php7.4-bcmath / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | libapache2-mod-php7.4 | p-cpe:/a:debian:debian_linux:libapache2-mod-php7.4 |
debian | debian_linux | libphp7.4-embed | p-cpe:/a:debian:debian_linux:libphp7.4-embed |
debian | debian_linux | php7.4 | p-cpe:/a:debian:debian_linux:php7.4 |
debian | debian_linux | php7.4-bcmath | p-cpe:/a:debian:debian_linux:php7.4-bcmath |
debian | debian_linux | php7.4-bz2 | p-cpe:/a:debian:debian_linux:php7.4-bz2 |
debian | debian_linux | php7.4-cgi | p-cpe:/a:debian:debian_linux:php7.4-cgi |
debian | debian_linux | php7.4-cli | p-cpe:/a:debian:debian_linux:php7.4-cli |
debian | debian_linux | php7.4-common | p-cpe:/a:debian:debian_linux:php7.4-common |
debian | debian_linux | php7.4-curl | p-cpe:/a:debian:debian_linux:php7.4-curl |
debian | debian_linux | php7.4-dba | p-cpe:/a:debian:debian_linux:php7.4-dba |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21707
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21708
packages.debian.org/source/bullseye/php7.4
security-tracker.debian.org/tracker/CVE-2021-21707
security-tracker.debian.org/tracker/CVE-2021-21708
security-tracker.debian.org/tracker/source-package/php7.4
www.debian.org/security/2022/dsa-5082
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 High
AI Score
Confidence
Low
0.003 Low
EPSS
Percentile
71.2%