The version of openssl11 installed on the remote host is prior to 1.1.1g-12. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2039 advisory.
A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the
X509_VERIFY_PARAM_set1_policies()’ function. (CVE-2023-0464)
Applications that use a non-default option when verifying certificates may be vulnerable to an attack from a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether. Policy processing is disabled by default but can be enabled by passing the -policy' argument to the command line utilities or by calling the
X509_VERIFY_PARAM_set1_policies()’ function. (CVE-2023-0465)
The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification.
As suddenly enabling the policy check could break existing deployments it was decided to keep the existing behavior of the X509_VERIFY_PARAM_add0_policy() function. Instead the applications that require OpenSSL to perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument.
Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.
(CVE-2023-0466)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2023-2039.
##
include('compat.inc');
if (description)
{
script_id(175969);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/10");
script_cve_id("CVE-2023-0464", "CVE-2023-0465", "CVE-2023-0466");
script_xref(name:"IAVA", value:"2023-A-0158-S");
script_name(english:"Amazon Linux 2 : openssl11 (ALAS-2023-2039)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The version of openssl11 installed on the remote host is prior to 1.1.1g-12. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2023-2039 advisory.
- A security vulnerability has been identified in all supported versions of OpenSSL related to the
verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit
this vulnerability by creating a malicious certificate chain that triggers exponential use of
computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy
processing is disabled by default but can be enabled by passing the `-policy' argument to the command line
utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function. (CVE-2023-0464)
- Applications that use a non-default option when verifying certificates may be vulnerable to an attack from
a malicious CA to circumvent certain checks. Invalid certificate policies in leaf certificates are
silently ignored by OpenSSL and other certificate policy checks are skipped for that certificate. A
malicious CA could use this to deliberately assert invalid certificate policies in order to circumvent
policy checking on the certificate altogether. Policy processing is disabled by default but can be enabled
by passing the `-policy' argument to the command line utilities or by calling the
`X509_VERIFY_PARAM_set1_policies()' function. (CVE-2023-0465)
- The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy
check when doing certificate verification. However the implementation of the function does not enable the
check which allows certificates with invalid or incorrect policies to pass the certificate verification.
As suddenly enabling the policy check could break existing deployments it was decided to keep the existing
behavior of the X509_VERIFY_PARAM_add0_policy() function. Instead the applications that require OpenSSL to
perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the
policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument.
Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.
(CVE-2023-0466)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2023-2039.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-0464.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-0465.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2023-0466.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update openssl11' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
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:N/S:U/C:N/I:L/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-0466");
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:"2023/03/22");
script_set_attribute(attribute:"patch_publication_date", value:"2023/05/11");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/05/17");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl11");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl11-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl11-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl11-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:openssl11-static");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 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/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var pkgs = [
{'reference':'openssl11-1.1.1g-12.amzn2.0.14', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-1.1.1g-12.amzn2.0.14', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-1.1.1g-12.amzn2.0.14', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-debuginfo-1.1.1g-12.amzn2.0.14', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-debuginfo-1.1.1g-12.amzn2.0.14', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-debuginfo-1.1.1g-12.amzn2.0.14', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-devel-1.1.1g-12.amzn2.0.14', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-devel-1.1.1g-12.amzn2.0.14', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-devel-1.1.1g-12.amzn2.0.14', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-libs-1.1.1g-12.amzn2.0.14', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-libs-1.1.1g-12.amzn2.0.14', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-libs-1.1.1g-12.amzn2.0.14', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-static-1.1.1g-12.amzn2.0.14', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-static-1.1.1g-12.amzn2.0.14', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'openssl11-static-1.1.1g-12.amzn2.0.14', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "openssl11 / openssl11-debuginfo / openssl11-devel / etc");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0464
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0465
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-0466
alas.aws.amazon.com/AL2/ALAS-2023-2039.html
alas.aws.amazon.com/cve/html/CVE-2023-0464.html
alas.aws.amazon.com/cve/html/CVE-2023-0465.html
alas.aws.amazon.com/cve/html/CVE-2023-0466.html
alas.aws.amazon.com/faqs.html