Vulnerabilities > CVE-2019-6956 - Out-of-bounds Read vulnerability in multiple products

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1899-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(128305);
  script_version("1.2");
  script_cvs_date("Date: 2019/12/31");

  script_cve_id("CVE-2018-19502", "CVE-2018-20196", "CVE-2018-20199", "CVE-2018-20360", "CVE-2019-15296", "CVE-2019-6956");

  script_name(english:"Debian DLA-1899-1 : faad2 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:
"Multiple vulnerabilities have been discovered in faad2, the Freeware
Advanced Audio Coder :

CVE-2018-19502

Heap buffer overflow in the function excluded_channels
(libfaad/syntax.c). This vulnerability might allow remote attackers to
cause denial of service via crafted MPEG AAC data.

CVE-2018-20196

Stack buffer overflow in the function calculate_gain
(libfaad/br_hfadj.c). This vulnerability might allow remote attackers
to cause denial of service or any unspecified impact via crafted MPEG
AAC data.

CVE-2018-20199 CVE-2018-20360

NULL pointer dereference in the function ifilter_bank
(libfaad/filtbank.c). This vulnerability might allow remote attackers
to cause denial of service via crafted MPEG AAC data.

CVE-2019-6956

Global buffer overflow in the function ps_mix_phase
(libfaad/ps_dec.c). This vulnerability might allow remote attackers to
cause denial of service or any other unspecified impact via crafted
MPEG AAC data.

CVE-2019-15296

Buffer overflow in the function faad_resetbits (libfaad/bits.c). This
vulnerability might allow remote attackers to cause denial of service
via crafted MPEG AAC data.

For Debian 8 'Jessie', these problems have been fixed in version
2.7-8+deb8u3.

We recommend that you upgrade your faad2 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/2019/08/msg00033.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/faad2"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  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:L/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:debian:debian_linux:faad");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:faad2-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libfaad-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libfaad2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/11/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/29");
  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 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:"faad", reference:"2.7-8+deb8u3")) flag++;
if (deb_check(release:"8.0", prefix:"faad2-dbg", reference:"2.7-8+deb8u3")) flag++;
if (deb_check(release:"8.0", prefix:"libfaad-dev", reference:"2.7-8+deb8u3")) flag++;
if (deb_check(release:"8.0", prefix:"libfaad2", reference:"2.7-8+deb8u3")) flag++;

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