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-5067-1 advisory.
A flaw was found in sssd Group Policy Objects implementation. When the GPO is not readable by SSSD due to a too strict permission settings on the server side, SSSD will allow all authenticated users to login instead of denying access. (CVE-2018-16838)
The UNIX pipe which sudo uses to contact SSSD and read the available sudo rules from SSSD has too wide permissions, which means that anyone who can send a message using the same raw protocol that sudo and SSSD use can read the sudo rules available for any user. This affects versions of SSSD before 1.16.3.
(CVE-2018-10852)
A vulnerability was found in sssd. If a user was configured with no home directory set, sssd would return ‘/’ (the root directory) instead of ‘’ (the empty string / no home directory). This could impact services that restrict the user’s filesystem access to within their home directory through chroot() etc. All versions before 2.1 are vulnerable. (CVE-2019-3811)
A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs- fetch and cache-expire subcommands. This flaw allows an attacker to trick the root user into running a specially crafted sssctl command, such as via sudo, to gain root access. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2021-3621)
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-5067-1. 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(153144);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/16");
script_cve_id(
"CVE-2018-10852",
"CVE-2018-16838",
"CVE-2019-3811",
"CVE-2021-3621"
);
script_xref(name:"USN", value:"5067-1");
script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS : SSSD vulnerabilities (USN-5067-1)");
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-5067-1 advisory.
- A flaw was found in sssd Group Policy Objects implementation. When the GPO is not readable by SSSD due to
a too strict permission settings on the server side, SSSD will allow all authenticated users to login
instead of denying access. (CVE-2018-16838)
- The UNIX pipe which sudo uses to contact SSSD and read the available sudo rules from SSSD has too wide
permissions, which means that anyone who can send a message using the same raw protocol that sudo and SSSD
use can read the sudo rules available for any user. This affects versions of SSSD before 1.16.3.
(CVE-2018-10852)
- A vulnerability was found in sssd. If a user was configured with no home directory set, sssd would return
'/' (the root directory) instead of '' (the empty string / no home directory). This could impact services
that restrict the user's filesystem access to within their home directory through chroot() etc. All
versions before 2.1 are vulnerable. (CVE-2019-3811)
- A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs-
fetch and cache-expire subcommands. This flaw allows an attacker to trick the root user into running a
specially crafted sssctl command, such as via sudo, to gain root access. The highest threat from this
vulnerability is to confidentiality, integrity, as well as system availability. (CVE-2021-3621)
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-5067-1");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3621");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/26");
script_set_attribute(attribute:"patch_publication_date", value:"2021/09/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/08");
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:libipa-hbac-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libipa-hbac0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss-sss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-sss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-certmap-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-certmap0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-idmap-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-idmap0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-simpleifp-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-simpleifp0");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsss-sudo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient-sssd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient-sssd-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libipa-hbac");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-libsss-nss-idmap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-sss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-libipa-hbac");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-libsss-nss-idmap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-sss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-ad");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-ad-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-dbus");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-ipa");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-kcm");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-krb5");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-krb5-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-proxy");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sssd-tools");
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': 'libipa-hbac-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libipa-hbac0', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libnss-sss', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libpam-sss', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-certmap-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-certmap0', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-idmap-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-idmap0', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-nss-idmap-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-nss-idmap0', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-simpleifp-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-simpleifp0', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libsss-sudo', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libwbclient-sssd', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'libwbclient-sssd-dev', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python-libipa-hbac', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python-libsss-nss-idmap', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python-sss', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python3-libipa-hbac', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python3-libsss-nss-idmap', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'python3-sss', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-ad', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-ad-common', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-common', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-dbus', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-ipa', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-kcm', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-krb5', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-krb5-common', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-ldap', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-proxy', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '18.04', 'pkgname': 'sssd-tools', 'pkgver': '1.16.1-1ubuntu1.8'},
{'osver': '20.04', 'pkgname': 'libipa-hbac-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libipa-hbac0', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libnss-sss', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libpam-sss', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-certmap-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-certmap0', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-idmap-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-idmap0', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-nss-idmap-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-nss-idmap0', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-simpleifp-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-simpleifp0', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libsss-sudo', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libwbclient-sssd', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'libwbclient-sssd-dev', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'python3-libipa-hbac', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'python3-libsss-nss-idmap', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'python3-sss', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-ad', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-ad-common', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-common', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-dbus', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-ipa', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-kcm', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-krb5', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-krb5-common', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-ldap', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-proxy', 'pkgver': '2.2.3-3ubuntu0.7'},
{'osver': '20.04', 'pkgname': 'sssd-tools', 'pkgver': '2.2.3-3ubuntu0.7'}
];
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, 'libipa-hbac-dev / libipa-hbac0 / libnss-sss / libpam-sss / 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 | libipa-hbac-dev | p-cpe:/a:canonical:ubuntu_linux:libipa-hbac-dev |
canonical | ubuntu_linux | libipa-hbac0 | p-cpe:/a:canonical:ubuntu_linux:libipa-hbac0 |
canonical | ubuntu_linux | libnss-sss | p-cpe:/a:canonical:ubuntu_linux:libnss-sss |
canonical | ubuntu_linux | libpam-sss | p-cpe:/a:canonical:ubuntu_linux:libpam-sss |
canonical | ubuntu_linux | libsss-certmap-dev | p-cpe:/a:canonical:ubuntu_linux:libsss-certmap-dev |
canonical | ubuntu_linux | libsss-certmap0 | p-cpe:/a:canonical:ubuntu_linux:libsss-certmap0 |
canonical | ubuntu_linux | libsss-idmap-dev | p-cpe:/a:canonical:ubuntu_linux:libsss-idmap-dev |
canonical | ubuntu_linux | libsss-idmap0 | p-cpe:/a:canonical:ubuntu_linux:libsss-idmap0 |