Vulnerabilities > CVE-2018-20751 - NULL Pointer Dereference vulnerability in Podofo Project Podofo 0.9.6

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2019:1849-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(126739);
  script_version("1.3");
  script_cvs_date("Date: 2020/01/08");

  script_cve_id("CVE-2017-8054", "CVE-2018-11255", "CVE-2018-12982", "CVE-2018-20751", "CVE-2018-5783");

  script_name(english:"SUSE SLED12 Security Update : podofo (SUSE-SU-2019:1849-1)");
  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 podofo fixes the following issues :

Security issues fixed :

CVE-2017-8054: Fixed a vulnerability in
PdfPagesTree::GetPageNodeFromArray function which could allow remote
attackers to cause Denial of Service (bsc#1035596).

CVE-2018-5783: Fixed an uncontrolled memory allocation in
PdfVecObjects::Reserve function (bsc#1076962).

CVE-2018-11255: Fixed a NULL pointer dereference in
PdfPage::GetPageNumber() function which could lead to Denial of
Service (bsc#1096890).

CVE-2018-20751: Fixed a NULL pointer dereference in crop_page function
(bsc#1124357).

CVE-2018-12982: Fixed an invalid memory read in
PdfVariant::DelayedLoad() function which could allow remote attackers
to cause Denial of Service (bsc#1099720).

Fixed a buffer overflow in TestEncrypt function.

Fixed a NULL pointer dereference in PdfTranslator-setTarget function.

Fixed a heap-based buffer overflow PdfVariant:DelayedLoad function.

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=1035596"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1076962"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1096890"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1099720"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1124357"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8054/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-11255/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-12982/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-20751/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-5783/"
  );
  # https://www.suse.com/support/update/announcement/2019/suse-su-20191849-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?69b78ba5"
  );
  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 Workstation Extension 12-SP4:zypper in -t patch
SUSE-SLE-WE-12-SP4-2019-1849=1

SUSE Linux Enterprise Software Development Kit 12-SP4:zypper in -t
patch SUSE-SLE-SDK-12-SP4-2019-1849=1

SUSE Linux Enterprise Desktop 12-SP4:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP4-2019-1849=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:R/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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libpodofo0_9_2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libpodofo0_9_2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:podofo-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:podofo-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/07/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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:"^(SLED12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12", "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 == "SLED12" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP4", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"libpodofo0_9_2-0.9.2-3.9.2")) flag++;
if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"libpodofo0_9_2-debuginfo-0.9.2-3.9.2")) flag++;
if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"podofo-debuginfo-0.9.2-3.9.2")) flag++;
if (rpm_check(release:"SLED12", sp:"4", cpu:"x86_64", reference:"podofo-debugsource-0.9.2-3.9.2")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "podofo");
}