Amazon Linux AMI : glibc (ALAS-2017-844) (Stack Clash)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-844.
#

include("compat.inc");

if (description)
{
  script_id(100873);
  script_version("3.7");
  script_cvs_date("Date: 2019/05/31 10:20:51");

  script_cve_id("CVE-2017-1000366");
  script_xref(name:"ALAS", value:"2017-844");

  script_name(english:"Amazon Linux AMI : glibc (ALAS-2017-844) (Stack Clash)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux AMI host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Glibc contains a vulnerability that allows specially crafted
LD_LIBRARY_PATH values to manipulate the heap/stack, causing them to
alias, potentially resulting in arbitrary code execution. Please note
that additional hardening changes have been made to glibc to prevent
manipulation of stack and heap memory but these issues are not
directly exploitable, as such they have not been given a CVE. This
affects glibc 2.25 and earlier. (CVE-2017-1000366)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2017-844.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update glibc' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-debuginfo-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:glibc-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:nscd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/20");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 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 != "A")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"ALA", reference:"glibc-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-common-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-debuginfo-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-debuginfo-common-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-devel-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-headers-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-static-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-utils-2.17-157.170.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"nscd-2.17-157.170.amzn1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "glibc / glibc-common / glibc-debuginfo / glibc-debuginfo-common / etc");
}