Debian DLA-1652-1 : libvncserver 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-1652-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(121517);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2018-15126", "CVE-2018-20748", "CVE-2018-20749", "CVE-2018-20750");

  script_name(english:"Debian DLA-1652-1 : libvncserver 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:
"A vulnerability was found by Kaspersky Lab in libvncserver, a C
library to implement VNC server/client functionalities. In addition,
some of the vulnerabilities addressed in DLA 1617-1 were found to have
incomplete fixes, and have been addressed in this update.

CVE-2018-15126

An attacker can cause denial of service or remote code execution via a
heap use-after-free issue in the tightvnc-filetransfer extension.

CVE-2018-20748 CVE-2018-20749 CVE-2018-20750

Some of the out of bound heap write fixes for CVE-2018-20019 and
CVE-2018-15127 were incomplete. These CVEs address those issues.

For Debian 8 'Jessie', these problems have been fixed in version
0.9.9+dfsg2-6.1+deb8u5.

We recommend that you upgrade your libvncserver 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/2019/01/msg00029.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/libvncserver"
  );
  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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncclient0-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncserver-config");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncserver-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncserver0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libvncserver0-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:linuxvnc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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:"8.0", prefix:"libvncclient0", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"libvncclient0-dbg", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"libvncserver-config", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"libvncserver-dev", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"libvncserver0", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"libvncserver0-dbg", reference:"0.9.9+dfsg2-6.1+deb8u5")) flag++;
if (deb_check(release:"8.0", prefix:"linuxvnc", reference:"0.9.9+dfsg2-6.1+deb8u5")) 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");