A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content. This is a variant of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) and affects all NSS versions prior to NSS 3.41. (CVE-2018-12404)
Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache side-channel attack on ECDSA signatures that can be mitigated through the use of blinding during the signing process in the
_gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host. (CVE-2018-0495)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2019-1305.
#
include("compat.inc");
if (description)
{
script_id(129563);
script_version("1.2");
script_cvs_date("Date: 2019/12/23");
script_cve_id("CVE-2018-0495", "CVE-2018-12404");
script_xref(name:"ALAS", value:"2019-1305");
script_name(english:"Amazon Linux 2 : nss (ALAS-2019-1305)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux 2 host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"A cached side channel attack during handshakes using RSA encryption
could allow for the decryption of encrypted content. This is a variant
of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack)
and affects all NSS versions prior to NSS 3.41. (CVE-2018-12404)
Libgcrypt before 1.7.10 and 1.8.x before 1.8.3 allows a memory-cache
side-channel attack on ECDSA signatures that can be mitigated through
the use of blinding during the signing process in the
_gcry_ecc_ecdsa_sign function in cipher/ecc-ecdsa.c, aka the Return Of
the Hidden Number Problem or ROHNP. To discover an ECDSA key, the
attacker needs access to either the local machine or a different
virtual machine on the same physical host. (CVE-2018-0495)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/AL2/ALAS-2019-1305.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update nss' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/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:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss-pkcs11-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss-sysinit");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nss-tools");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/06/13");
script_set_attribute(attribute:"patch_publication_date", value:"2019/10/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/10/04");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string: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);
flag = 0;
if (rpm_check(release:"AL2", reference:"nss-3.44.0-4.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-debuginfo-3.44.0-4.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-devel-3.44.0-4.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-pkcs11-devel-3.44.0-4.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-sysinit-3.44.0-4.amzn2.0.2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-tools-3.44.0-4.amzn2.0.2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "nss / nss-debuginfo / nss-devel / nss-pkcs11-devel / nss-sysinit / etc");
}