SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2018:0830-1)

2018-03-28T00:00:00
ID SUSE_SU-2018-0830-1.NASL
Type nessus
Reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2021-01-02T00:00:00

Description

LibVNCServer was updated to fix two security issues. These security issues were fixed :

  • CVE-2018-7225: Missing input sanitization inside rfbserver.c rfbProcessClientNormalMessage() (bsc#1081493).

  • CVE-2016-9942: Heap-based buffer overflow in ultra.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions (bsc#1017712).

  • CVE-2016-9941: Heap-based buffer overflow in rfbproto.c allowed remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area (bsc#1017711).

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-2018:0830-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(108685);
  script_version("1.5");
  script_cvs_date("Date: 2019/09/10 13:51:47");

  script_cve_id("CVE-2016-9941", "CVE-2016-9942", "CVE-2018-7225");

  script_name(english:"SUSE SLES12 Security Update : LibVNCServer (SUSE-SU-2018:0830-1)");
  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:
"LibVNCServer was updated to fix two security issues. These security
issues were fixed :

  - CVE-2018-7225: Missing input sanitization inside
    rfbserver.c rfbProcessClientNormalMessage()
    (bsc#1081493).

  - CVE-2016-9942: Heap-based buffer overflow in ultra.c
    allowed remote servers to cause a denial of service
    (application crash) or possibly execute arbitrary code
    via a crafted FramebufferUpdate message with the Ultra
    type tile, such that the LZO payload decompressed length
    exceeds what is specified by the tile dimensions
    (bsc#1017712).

  - CVE-2016-9941: Heap-based buffer overflow in rfbproto.c
    allowed remote servers to cause a denial of service
    (application crash) or possibly execute arbitrary code
    via a crafted FramebufferUpdate message containing a
    subrectangle outside of the client drawing area
    (bsc#1017711).

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=1017711"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1017712"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1081493"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-9941/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-9942/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-7225/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20180830-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?3b21b199"
  );
  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 Software Development Kit 12-SP3:zypper in -t
patch SUSE-SLE-SDK-12-SP3-2018-554=1

SUSE Linux Enterprise Software Development Kit 12-SP2:zypper in -t
patch SUSE-SLE-SDK-12-SP2-2018-554=1

SUSE Linux Enterprise Server for Raspberry Pi 12-SP2:zypper in -t
patch SUSE-SLE-RPI-12-SP2-2018-554=1

SUSE Linux Enterprise Server 12-SP3:zypper in -t patch
SUSE-SLE-SERVER-12-SP3-2018-554=1

SUSE Linux Enterprise Server 12-SP2:zypper in -t patch
SUSE-SLE-SERVER-12-SP2-2018-554=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:LibVNCServer-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libvncclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libvncclient0-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libvncserver0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libvncserver0-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/12/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/03/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/28");
  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);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(2|3)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP2/3", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"3", reference:"LibVNCServer-debugsource-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libvncclient0-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libvncclient0-debuginfo-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libvncserver0-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libvncserver0-debuginfo-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"LibVNCServer-debugsource-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"libvncclient0-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"libvncclient0-debuginfo-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"libvncserver0-0.9.9-17.5.1")) flag++;
if (rpm_check(release:"SLES12", sp:"2", reference:"libvncserver0-debuginfo-0.9.9-17.5.1")) 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, "LibVNCServer");
}