Debian DLA-331-1 : polarssl security update

2015-10-23T00:00:00
ID DEBIAN_DLA-331.NASL
Type nessus
Reporter Tenable
Modified 2018-07-06T00:00:00

Description

A flaw was found in PolarSSl and mbed TLS :

When the client creates its ClientHello message, due to insufficient bounds checking it can overflow the heap-based buffer containing the message while writing some extensions. Two extensions in particular could be used by a remote attacker to trigger the overflow: the session ticket extension and the server name indication (SNI) extension.

Although most of the vulnerable code is not present in the Squeeze version, this upload contains at least a length check for incoming data.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-331-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(86552);
  script_version("2.5");
  script_cvs_date("Date: 2018/07/06 11:26:06");

  script_cve_id("CVE-2015-5291");

  script_name(english:"Debian DLA-331-1 : polarssl 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 flaw was found in PolarSSl and mbed TLS :

When the client creates its ClientHello message, due to insufficient
bounds checking it can overflow the heap-based buffer containing the
message while writing some extensions. Two extensions in particular
could be used by a remote attacker to trigger the overflow: the
session ticket extension and the server name indication (SNI)
extension.

Although most of the vulnerable code is not present in the Squeeze
version, this upload contains at least a length check for incoming
data.

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/2015/10/msg00009.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze-lts/polarssl"
  );
  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_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:libpolarssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolarssl-runtime");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpolarssl0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/10/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/10/23");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2018 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:"6.0", prefix:"libpolarssl-dev", reference:"1.2.9-1~deb6u5")) flag++;
if (deb_check(release:"6.0", prefix:"libpolarssl-runtime", reference:"1.2.9-1~deb6u5")) flag++;
if (deb_check(release:"6.0", prefix:"libpolarssl0", reference:"1.2.9-1~deb6u5")) 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");