Amazon Linux 2 : xerces-c (ALAS-2020-1415)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2020-1415.
#

include('compat.inc');

if (description)
{
  script_id(135933);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/14");

  script_cve_id("CVE-2018-1311");
  script_xref(name:"ALAS", value:"2020-1415");

  script_name(english:"Amazon Linux 2 : xerces-c (ALAS-2020-1415)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"A use-after-free vulnerability was found in xerces-c in the way an XML
document is processed via the SAX API. Applications that process XML
documents with an external Document Type Definition (DTD) may be
vulnerable to this flaw. A remote attacker could exploit this flaw by
creating a specially crafted XML file that would crash the application
or potentially lead to arbitrary code execution. (CVE-2018-1311)");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2020-1415.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update xerces-c' 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:H/PR:N/UI:N/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-2018-1311");

  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:"2019/12/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xerces-c");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xerces-c-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xerces-c-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xerces-c-doc");
  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:"xerces-c-3.1.1-10.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"xerces-c-debuginfo-3.1.1-10.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"xerces-c-devel-3.1.1-10.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"xerces-c-doc-3.1.1-10.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, "xerces-c / xerces-c-debuginfo / xerces-c-devel / xerces-c-doc");
}