Amazon Linux AMI : glibc (ALAS-2015-468)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2015-468.
#

include("compat.inc");

if (description)
{
  script_id(80419);
  script_version("1.6");
  script_cvs_date("Date: 2018/04/18 15:09:35");

  script_cve_id("CVE-2014-6040", "CVE-2014-7817");
  script_xref(name:"ALAS", value:"2015-468");
  script_xref(name:"RHSA", value:"2015:0016");

  script_name(english:"Amazon Linux AMI : glibc (ALAS-2015-468)");
  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:
"An out-of-bounds read flaw was found in the way glibc's iconv()
function converted certain encoded data to UTF-8. An attacker able to
make an application call the iconv() function with a specially crafted
argument could use this flaw to crash that application.
(CVE-2014-6040)

It was found that the wordexp() function would perform command
substitution even when the WRDE_NOCMD flag was specified. An attacker
able to provide specially crafted input to an application using the
wordexp() function, and not sanitizing the input correctly, could
potentially use this flaw to execute arbitrary commands with the
credentials of the user running that application. (CVE-2014-7817)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2015-468.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update glibc' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");

  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:"patch_publication_date", value:"2015/01/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/01/09");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2018 Tenable Network Security, Inc.");
  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-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-common-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-debuginfo-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-debuginfo-common-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-devel-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-headers-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-static-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"glibc-utils-2.17-55.92.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"nscd-2.17-55.92.amzn1")) 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, "glibc / glibc-common / glibc-debuginfo / glibc-debuginfo-common / etc");
}