SUSE SLES12 Security Update : kernel (SUSE-SU-2019:0095-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2019:0095-1.
# The text itself is copyright (C) SUSE.
#

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  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/24");

  script_cve_id(
    "CVE-2018-7480",
    "CVE-2018-7757",
    "CVE-2018-9516",
    "CVE-2018-10940",
    "CVE-2018-14613",
    "CVE-2018-14617",
    "CVE-2018-14633",
    "CVE-2018-16276",
    "CVE-2018-16597",
    "CVE-2018-16658",
    "CVE-2018-17182",
    "CVE-2018-18281",
    "CVE-2018-18386",
    "CVE-2018-18690",
    "CVE-2018-18710"
  );

  script_name(english:"SUSE SLES12 Security Update : kernel (SUSE-SU-2019:0095-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The SUSE Linux Enterprise 12 SP3 Azure kernel was updated to 4.4.162
to receive various security and bugfixes.

The following security bugs were fixed :

CVE-2018-18281: The mremap() syscall performs TLB flushes after
dropping pagetable locks. If a syscall such as ftruncate() removes
entries from the pagetables of a task that is in the middle of
mremap(), a stale TLB entry can remain for a short time that permits
access to a physical page after it has been released back to the page
allocator and reused. (bnc#1113769).

CVE-2018-18710: An information leak in cdrom_ioctl_select_disc in
drivers/cdrom/cdrom.c could be used by local attackers to read kernel
memory because a cast from unsigned long to int interferes with bounds
checking. This is similar to CVE-2018-10940 and CVE-2018-16658
(bnc#1113751).

CVE-2018-18690: A local attacker able to set attributes on an xfs
filesystem could make this filesystem non-operational until the next
mount by triggering an unchecked error condition during an xfs
attribute change, because xfs_attr_shortform_addname in
fs/xfs/libxfs/xfs_attr.c mishandled ATTR_REPLACE operations with
conversion of an attr from short to long form (bnc#1105025).

CVE-2018-18386: drivers/tty/n_tty.c allowed local attackers (who are
able to access pseudo terminals) to hang/block further usage of any
pseudo terminal devices due to an EXTPROC versus ICANON confusion in
TIOCINQ (bnc#1094825).

CVE-2018-9516: In hid_debug_events_read of drivers/hid/hid-debug.c,
there is a possible out of bounds write due to a missing bounds check.
This could lead to local escalation of privilege with System execution
privileges needed. User interaction is not needed for exploitation.
(bnc#1108498).

CVE-2018-14633: A security flaw was found in the
chap_server_compute_md5() function in the ISCSI target code in a way
an authentication request from an ISCSI initiator is processed. An
unauthenticated remote attacker can cause a stack-based 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. (bnc#1107829).

CVE-2018-17182: The vmacache_flush_all function in mm/vmacache.c
mishandled sequence number overflows. An attacker can trigger a
use-after-free (and possibly gain privileges) via certain thread
creation, map, unmap, invalidation, and dereference operations
(bnc#1108399).

CVE-2018-16597: Incorrect access checking in overlayfs mounts could be
used by local attackers to modify or truncate files in the underlying
filesystem (bnc#1106512).

CVE-2018-14613: There is an invalid pointer dereference in
io_ctl_map_page() when mounting and operating a crafted btrfs image,
because of a lack of block group item validation in check_leaf_item in
fs/btrfs/tree-checker.c (bnc#1102896).

CVE-2018-14617: There is a NULL pointer dereference and panic in
hfsplus_lookup() in fs/hfsplus/dir.c when opening a file (that is
purportedly a hard link) in an hfs+ filesystem that has malformed
catalog data, and is mounted read-only without a metadata directory
(bnc#1102870).

CVE-2018-16276: Local attackers could use user access read/writes with
incorrect bounds checking in the yurex USB driver to crash the kernel
or potentially escalate privileges (bnc#1106095 bnc#1115593).

CVE-2018-7757: Memory leak in the sas_smp_get_phy_events function in
drivers/scsi/libsas/sas_expander.c allowed local users to cause a
denial of service (memory consumption) via many read accesses to files
in the /sys/class/sas_phy directory, as demonstrated by the
/sys/class/sas_phy/phy-1:0:12/invalid_dword_count file (bnc#1087209).

CVE-2018-7480: The blkcg_init_queue function in block/blk-cgroup.c
allowed local users to cause a denial of service (double free) or
possibly have unspecified other impact by triggering a creation
failure (bnc#1082863).

The update package also includes non-security fixes. See advisory for
details.

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.");
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  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2018-7757/");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2018-9516/");
  # https://www.suse.com/support/update/announcement/2019/suse-su-20190095-1/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fa701622");
  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 12-SP3:zypper in -t patch
SUSE-SLE-SERVER-12-SP3-2019-95=1");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/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:L/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:"cvss_score_source", value:"CVE-2018-14633");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-9516");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/02/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/01/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure-base-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-azure-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:kernel-syms-azure");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SuSE Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP3", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-base-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-base-debuginfo-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-debuginfo-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-debugsource-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-azure-devel-4.4.162-4.19.2")) flag++;
if (rpm_check(release:"SLES12", sp:"3", cpu:"x86_64", reference:"kernel-syms-azure-4.4.162-4.19.1")) 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");
}