Oracle Linux 6 : kernel (ELSA-2013-0830)

2013-07-12T00:00:00
ID ORACLELINUX_ELSA-2013-0830.NASL
Type nessus
Reporter Tenable
Modified 2017-12-04T00:00:00

Description

From Red Hat Security Advisory 2013:0830 :

Updated kernel packages that fix one security issue are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issue :

  • It was found that the Red Hat Enterprise Linux 6.1 kernel update (RHSA-2011:0542) introduced an integer conversion issue in the Linux kernel's Performance Events implementation. This led to a user-supplied index into the perf_swevent_enabled array not being validated properly, resulting in out-of-bounds kernel memory access. A local, unprivileged user could use this flaw to escalate their privileges. (CVE-2013-2094, Important)

A public exploit that affects Red Hat Enterprise Linux 6 is available.

Refer to Red Hat Knowledge Solution 373743, linked to in the References, for further information and mitigation instructions for users who are unable to immediately apply this update.

Users should upgrade to these updated packages, which contain a backported patch to correct this issue. The system must be rebooted for this update to take effect.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2013:0830 and 
# Oracle Linux Security Advisory ELSA-2013-0830 respectively.
#

include("compat.inc");

if (description)
{
  script_id(68823);
  script_version("$Revision: 1.7 $");
  script_cvs_date("$Date: 2017/12/04 14:30:54 $");

  script_cve_id("CVE-2013-2094");
  script_osvdb_id(93361);
  script_xref(name:"RHSA", value:"2013:0830");

  script_name(english:"Oracle Linux 6 : kernel (ELSA-2013-0830)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Oracle Linux host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"From Red Hat Security Advisory 2013:0830 :

Updated kernel packages that fix one security issue are now available
for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System
(CVSS) base score, which gives a detailed severity rating, is
available from the CVE link in the References section.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issue :

* It was found that the Red Hat Enterprise Linux 6.1 kernel update
(RHSA-2011:0542) introduced an integer conversion issue in the Linux
kernel's Performance Events implementation. This led to a
user-supplied index into the perf_swevent_enabled array not being
validated properly, resulting in out-of-bounds kernel memory access. A
local, unprivileged user could use this flaw to escalate their
privileges. (CVE-2013-2094, Important)

A public exploit that affects Red Hat Enterprise Linux 6 is available.

Refer to Red Hat Knowledge Solution 373743, linked to in the
References, for further information and mitigation instructions for
users who are unable to immediately apply this update.

Users should upgrade to these updated packages, which contain a
backported patch to correct this issue. The system must be rebooted
for this update to take effect."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/el-errata/2013-May/003476.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected kernel packages."
  );
  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:H/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-debug-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-firmware");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:kernel-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:perf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:python-perf");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:6");

  script_set_attribute(attribute:"patch_publication_date", value:"2013/05/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2017 Tenable Network Security, Inc.");
  script_family(english:"Oracle Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/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);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !eregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = eregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! ereg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 6", "Oracle Linux " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Oracle Linux", cpu);

flag = 0;
if (rpm_exists(release:"EL6", rpm:"kernel-2.6.32") && rpm_check(release:"EL6", reference:"kernel-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-debug-2.6.32") && rpm_check(release:"EL6", reference:"kernel-debug-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-debug-devel-2.6.32") && rpm_check(release:"EL6", reference:"kernel-debug-devel-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-devel-2.6.32") && rpm_check(release:"EL6", reference:"kernel-devel-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-doc-2.6.32") && rpm_check(release:"EL6", reference:"kernel-doc-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-firmware-2.6.32") && rpm_check(release:"EL6", reference:"kernel-firmware-2.6.32-358.6.2.el6")) flag++;
if (rpm_exists(release:"EL6", rpm:"kernel-headers-2.6.32") && rpm_check(release:"EL6", reference:"kernel-headers-2.6.32-358.6.2.el6")) flag++;
if (rpm_check(release:"EL6", reference:"perf-2.6.32-358.6.2.el6")) flag++;
if (rpm_check(release:"EL6", reference:"python-perf-2.6.32-358.6.2.el6")) 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, "affected kernel");
}