The remote Ubuntu 18.04 LTS / 20.04 LTS / 21.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5090-1 advisory.
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
(CVE-2021-33193)
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-34798)
A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive). (CVE-2021-36160)
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-39275)
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-40438)
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 Ubuntu Security Notice USN-5090-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(153768);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/16");
script_cve_id(
"CVE-2021-33193",
"CVE-2021-34798",
"CVE-2021-36160",
"CVE-2021-39275",
"CVE-2021-40438"
);
script_xref(name:"USN", value:"5090-1");
script_xref(name:"IAVA", value:"2021-A-0440-S");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/12/15");
script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS : Apache HTTP Server vulnerabilities (USN-5090-1)");
script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Ubuntu 18.04 LTS / 20.04 LTS / 21.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-5090-1 advisory.
- A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead
to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
(CVE-2021-33193)
- Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP
Server 2.4.48 and earlier. (CVE-2021-34798)
- A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and
crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive). (CVE-2021-36160)
- ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules
pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache
HTTP Server 2.4.48 and earlier. (CVE-2021-39275)
- A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the
remote user. This issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-40438)
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://ubuntu.com/security/notices/USN-5090-1");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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-2021-39275");
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:"2021/08/16");
script_set_attribute(attribute:"patch_publication_date", value:"2021/09/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/27");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-bin");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-data");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-ssl-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-custom");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-pristine");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:apache2-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-md");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-proxy-uwsgi");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Ubuntu Local Security Checks");
script_copyright(english:"Ubuntu Security Notice (C) 2021-2023 Canonical, Inc. / NASL script (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
exit(0);
}
include('debian_package.inc');
if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 18.04 / 20.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var pkgs = [
{'osver': '18.04', 'pkgname': 'apache2', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '18.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.29-1ubuntu4.17'},
{'osver': '20.04', 'pkgname': 'apache2', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-bin', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-data', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-dev', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-ssl-dev', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-suexec-custom', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-suexec-pristine', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'apache2-utils', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'libapache2-mod-md', 'pkgver': '2.4.41-4ubuntu3.5'},
{'osver': '20.04', 'pkgname': 'libapache2-mod-proxy-uwsgi', 'pkgver': '2.4.41-4ubuntu3.5'}
];
var flag = 0;
foreach package_array ( pkgs ) {
var osver = NULL;
var pkgname = NULL;
var pkgver = NULL;
if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
if (osver && pkgname && pkgver) {
if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : ubuntu_report_get()
);
exit(0);
}
else
{
var tested = ubuntu_pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'apache2 / apache2-bin / apache2-data / apache2-dev / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
canonical | ubuntu_linux | 18.04 | cpe:/o:canonical:ubuntu_linux:18.04:-:lts |
canonical | ubuntu_linux | 20.04 | cpe:/o:canonical:ubuntu_linux:20.04:-:lts |
canonical | ubuntu_linux | apache2 | p-cpe:/a:canonical:ubuntu_linux:apache2 |
canonical | ubuntu_linux | apache2-bin | p-cpe:/a:canonical:ubuntu_linux:apache2-bin |
canonical | ubuntu_linux | apache2-data | p-cpe:/a:canonical:ubuntu_linux:apache2-data |
canonical | ubuntu_linux | apache2-dev | p-cpe:/a:canonical:ubuntu_linux:apache2-dev |
canonical | ubuntu_linux | apache2-ssl-dev | p-cpe:/a:canonical:ubuntu_linux:apache2-ssl-dev |
canonical | ubuntu_linux | apache2-suexec-custom | p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-custom |
canonical | ubuntu_linux | apache2-suexec-pristine | p-cpe:/a:canonical:ubuntu_linux:apache2-suexec-pristine |
canonical | ubuntu_linux | apache2-utils | p-cpe:/a:canonical:ubuntu_linux:apache2-utils |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33193
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34798
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36160
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39275
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40438
ubuntu.com/security/notices/USN-5090-1