Debian DLA-1194-1 : libxml2 security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1194-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(104936);
  script_version("3.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2017-16931", "CVE-2017-16932");

  script_name(english:"Debian DLA-1194-1 : libxml2 security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"CVE-2017-16931 parser.c in libxml2 before 2.9.5 mishandles
parameter-entity references because the NEXTL macro calls the
xmlParserHandlePEReference function in the case of a '%' character in
a DTD name.

CVE-2017-16932 parser.c in libxml2 before 2.9.5 does not prevent
infinite recursion in parameter entities.

For Debian 7 'Wheezy', these problems have been fixed in version
2.8.0+dfsg1-7+wheezy11.

We recommend that you upgrade your libxml2 packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA 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://lists.debian.org/debian-lts-announce/2017/11/msg00041.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/libxml2"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  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:debian:debian_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-utils-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2-dbg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/11/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/01");
  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:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"libxml2", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"libxml2-dbg", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"libxml2-dev", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"libxml2-doc", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"libxml2-utils", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"libxml2-utils-dbg", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"python-libxml2", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;
if (deb_check(release:"7.0", prefix:"python-libxml2-dbg", reference:"2.8.0+dfsg1-7+wheezy11")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");