GLSA-201701-74 : libpng: Remote execution of arbitrary code

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201701-74.
#
# The advisory text is Copyright (C) 2001-2017 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(96860);
  script_version("3.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2016-10087");
  script_xref(name:"GLSA", value:"201701-74");

  script_name(english:"GLSA-201701-74 : libpng: Remote execution of arbitrary code");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201701-74
(libpng: Remote execution of arbitrary code)

    A NULL pointer dereference was discovered in libpng in the
      png_push_save_buffer function.  In order to be vulnerable, an application
      has to load a text chunk into the PNG structure, then delete all text,
      then add another text chunk to the same PNG structure, which seems to be
      an unlikely sequence, but it is possible.
  
Impact :

    A remote attacker, by enticing a user to process a specially crafted PNG
      file, could execute arbitrary code with the privileges of the process.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201701-74"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All libpng 1.6.x users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=media-libs/libpng-1.6.27'
    All libpng 1.5.x users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=media-libs/libpng-1.5.28:1.5'
    All libpng 1.2.x users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=media-libs/libpng-1.2.57:1.2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:gentoo:linux:libpng");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/30");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"media-libs/libpng", unaffected:make_list("ge 1.6.27", "ge 1.5.28", "ge 1.2.57"), vulnerable:make_list("lt 1.6.27"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libpng");
}