Vulnerabilities > CVE-2016-2053 - Cryptographic Issues vulnerability in Linux Kernel

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2016:2002-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(93276);
  script_version("2.7");
  script_cvs_date("Date: 2019/09/11 11:22:13");

  script_cve_id("CVE-2013-7446", "CVE-2015-8816", "CVE-2016-0758", "CVE-2016-1583", "CVE-2016-2053", "CVE-2016-3134", "CVE-2016-4470", "CVE-2016-4565");

  script_name(english:"SUSE SLES12 Security Update : kernel (SUSE-SU-2016:2002-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for the Linux Kernel 3.12.51-52_34 fixes several issues.
The following security bugs were fixed :

  - CVE-2016-4470: The key_reject_and_link function in
    security/keys/key.c in the Linux kernel did not ensure
    that a certain data structure is initialized, which
    allowed local users to cause a denial of service (system
    crash) via vectors involving a crafted keyctl request2
    command (bsc#984764).

  - CVE-2016-1583: The ecryptfs_privileged_open function in
    fs/ecryptfs/kthread.c in the Linux kernel allowed local
    users to gain privileges or cause a denial of service
    (stack memory consumption) via vectors involving crafted
    mmap calls for /proc pathnames, leading to recursive
    pagefault handling (bsc#983144).

  - CVE-2016-4565: The InfiniBand (aka IB) stack in the
    Linux kernel incorrectly relied on the write system
    call, which allowed local users to cause a denial of
    service (kernel memory write operation) or possibly have
    unspecified other impact via a uAPI interface
    (bsc#980883).

  - CVE-2016-0758: Integer overflow in lib/asn1_decoder.c in
    the Linux kernel allowed local users to gain privileges
    via crafted ASN.1 data (bsc#980856).

  - CVE-2016-2053: The asn1_ber_decoder function in
    lib/asn1_decoder.c in the Linux kernel allowed attackers
    to cause a denial of service (panic) via an ASN.1 BER
    file that lacks a public key, leading to mishandling by
    the public_key_verify_signature function in
    crypto/asymmetric_keys/public_key.c (bsc#979074).

  - CVE-2015-8816: The hub_activate function in
    drivers/usb/core/hub.c in the Linux kernel did not
    properly maintain a hub-interface data structure, which
    allowed physically proximate attackers to cause a denial
    of service (invalid memory access and system crash) or
    possibly have unspecified other impact by unplugging a
    USB hub device (bsc#979064).

  - CVE-2016-3134: The netfilter subsystem in the Linux
    kernel did not validate certain offset fields, which
    allowed local users to gain privileges or cause a denial
    of service (heap memory corruption) via an
    IPT_SO_SET_REPLACE setsockopt call (bsc#971793).

  - CVE-2013-7446: Use-after-free vulnerability in
    net/unix/af_unix.c in the Linux kernel allowed local
    users to bypass intended AF_UNIX socket permissions or
    cause a denial of service (panic) via crafted epoll_ctl
    calls (bsc#973570, bsc#955837).

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=955837"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=971793"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=973570"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=979064"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=979074"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=980856"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=980883"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=983144"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=984764"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2013-7446/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2015-8816/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-0758/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-1583/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-2053/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-3134/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-4470/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-4565/"
  );
  # https://www.suse.com/support/update/announcement/2016/suse-su-20162002-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?664c10b2"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server for SAP 12:zypper in -t patch
SUSE-SLE-SAP-12-2016-1190=1

SUSE Linux Enterprise Server 12-LTSS:zypper in -t patch
SUSE-SLE-SERVER-12-2016-1190=1

To bring your system up-to-date, use 'zypper patch'."
  );
  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:N/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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kgraft-patch-3_12_51-52_34-default");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kgraft-patch-3_12_51-52_34-xen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/02");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/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/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES12", "SUSE " + os_ver);

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

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);
if (cpu >!< "x86_64") audit(AUDIT_ARCH_NOT, "x86_64", cpu);


sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(0)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP0", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"0", cpu:"x86_64", reference:"kgraft-patch-3_12_51-52_34-default-5-2.2")) flag++;
if (rpm_check(release:"SLES12", sp:"0", cpu:"x86_64", reference:"kgraft-patch-3_12_51-52_34-xen-5-2.2")) 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, "kernel");
}