Amazon Linux AMI : kernel (ALAS-2013-233)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2013-233.
#

include("compat.inc");

if (description)
{
  script_id(70569);
  script_version("1.4");
  script_cvs_date("Date: 2018/04/18 15:09:35");

  script_cve_id("CVE-2012-4398", "CVE-2013-2141", "CVE-2013-4162", "CVE-2013-4299", "CVE-2013-4387");
  script_xref(name:"ALAS", value:"2013-233");

  script_name(english:"Amazon Linux AMI : kernel (ALAS-2013-233)");
  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:
"The do_tkill function in kernel/signal.c in the Linux kernel before
3.8.9 does not initialize a certain data structure, which allows local
users to obtain sensitive information from kernel memory via a crafted
application that makes a (1) tkill or (2) tgkill system call.

The udp_v6_push_pending_frames function in net/ipv6/udp.c in the IPv6
implementation in the Linux kernel through 3.10.3 makes an incorrect
function call for pending data, which allows local users to cause a
denial of service (BUG and system crash) via a crafted application
that uses the UDP_CORK option in a setsockopt system call.

net/ipv6/ip6_output.c in the Linux kernel through 3.11.4 does not
properly determine the need for UDP Fragmentation Offload (UFO)
processing of small packets after the UFO queueing of a large packet,
which allows remote attackers to cause a denial of service (memory
corruption and system crash) or possibly have unspecified other impact
via network traffic that triggers a large response packet.

The __request_module function in kernel/kmod.c in the Linux kernel
before 3.4 does not set a certain killable attribute, which allows
local users to cause a denial of service (memory consumption) via a
crafted application.

Interpretation conflict in drivers/md/dm-snap-persistent.c in the
Linux kernel through 3.11.6 allows remote authenticated users to
obtain sensitive information or modify data via a crafted mapping to a
snapshot block device."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2013-233.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Run 'yum update kernel' to update your system. You will need to reboot
your system in order for the new kernel to be running."
  );
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-i686");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:kernel-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2013/10/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/24");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2018 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:"kernel-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-debuginfo-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"i686", reference:"kernel-debuginfo-common-i686-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", cpu:"x86_64", reference:"kernel-debuginfo-common-x86_64-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-devel-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-doc-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-headers-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-3.4.66-55.43.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"kernel-tools-debuginfo-3.4.66-55.43.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, "kernel / kernel-debuginfo / kernel-debuginfo-common-i686 / etc");
}