Amazon Linux 2 : nss (ALAS-2020-1384)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2020-1384.
#

include('compat.inc');

if (description)
{
  script_id(133094);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/29");

  script_cve_id("CVE-2019-11729", "CVE-2019-11745");
  script_xref(name:"ALAS", value:"2020-1384");

  script_name(english:"Amazon Linux 2 : nss (ALAS-2020-1384)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"A heap-based buffer overflow was found in the NSC_EncryptUpdate()
function in Mozilla nss. A remote attacker could trigger this flaw via
SRTP encrypt or decrypt operations, to execute arbitrary code with the
permissions of the user running the application (compiled with nss).
While the attack complexity is high, the impact to confidentiality,
integrity, and availability are high as well. (CVE-2019-11745)

Empty or malformed p256-ECDH public keys may trigger a segmentation
fault due values being improperly sanitized before being copied into
memory and used. This vulnerability affects Firefox ESR < 60.8,
Firefox < 68, and Thunderbird < 60.8. (CVE-2019-11729)");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2020-1384.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:P/A:P");
  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-2019-11745");

  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:"2019/07/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/21");

  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:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Amazon Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2024 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("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-3.44.0-7.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-debuginfo-3.44.0-7.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-devel-3.44.0-7.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-pkcs11-devel-3.44.0-7.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-sysinit-3.44.0-7.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"nss-tools-3.44.0-7.amzn2")) 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");
}