SUSE SLES12 Security Update : kernel (SUSE-SU-2018:3789-1)

2018-11-19T00:00:00
ID SUSE_SU-2018-3789-1.NASL
Type nessus
Reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-12-02T00:00:00

Description

This update for the Linux Kernel 4.4.121-92_98 fixes several issues.

The following security issues were fixed :

CVE-2018-14633: A security flaw was found in the chap_server_compute_md5() function in the ISCSI target code in the Linux kernel in a way an authentication request from an ISCSI initiator is processed. An unauthenticated remote attacker can cause a stack buffer overflow and smash up to 17 bytes of the stack. The attack requires the iSCSI target to be enabled on the victim host. Depending on how the target's code was built (i.e. depending on a compiler, compile flags and hardware architecture) an attack may lead to a system crash and thus to a denial-of-service or possibly to a non-authorized access to data exported by an iSCSI target. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is highly unlikely (bsc#1107832).

CVE-2018-5390: Fixed the possiblilty that the kernel can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service (bnc#1102682).

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:3789-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(119034);
  script_version("1.2");
  script_cvs_date("Date: 2019/09/10 13:51:49");

  script_cve_id("CVE-2018-14633", "CVE-2018-5390");

  script_name(english:"SUSE SLES12 Security Update : kernel (SUSE-SU-2018:3789-1)");
  script_summary(english:"Checks rpm output for the updated package.");

  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 4.4.121-92_98 fixes several issues.

The following security issues were fixed :

CVE-2018-14633: A security flaw was found in the
chap_server_compute_md5() function in the ISCSI target code in the
Linux kernel in a way an authentication request from an ISCSI
initiator is processed. An unauthenticated remote attacker can cause a
stack buffer overflow and smash up to 17 bytes of the stack. The
attack requires the iSCSI target to be enabled on the victim host.
Depending on how the target's code was built (i.e. depending on a
compiler, compile flags and hardware architecture) an attack may lead
to a system crash and thus to a denial-of-service or possibly to a
non-authorized access to data exported by an iSCSI target. Due to the
nature of the flaw, privilege escalation cannot be fully ruled out,
although we believe it is highly unlikely (bsc#1107832).

CVE-2018-5390: Fixed the possiblilty that the kernel can be forced to
make very expensive calls to tcp_collapse_ofo_queue() and
tcp_prune_ofo_queue() for every incoming packet which can lead to a
denial of service (bnc#1102682).

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=1102682"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1107832"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-14633/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-5390/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20183789-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?8a631f40"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server for SAP 12-SP2:zypper in -t patch
SUSE-SLE-SAP-12-SP2-2018-2688=1

SUSE Linux Enterprise Server 12-SP2-LTSS:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2018-2688=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kgraft-patch-4_4_121-92_98-default");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/19");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 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:"^(2)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"2", cpu:"x86_64", reference:"kgraft-patch-4_4_121-92_98-default-2-2.1")) 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");
}