Debian DLA-634-1 : dropbear security update

2016-09-26T00:00:00
ID DEBIAN_DLA-634.NASL
Type nessus
Reporter This script is Copyright (C) 2016 Tenable Network Security, Inc.
Modified 2020-02-02T00:00:00

Description

It was discovered that there were two issues in dropbear, a lightweight SSH2 server and client :

  • CVE-2016-7406: Potential issues in exit message formatting.

  • CVE-2016-7407: Overflows when parsing OpenSSH

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-634-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(93688);
  script_version("$Revision: 2.1 $");
  script_cvs_date("$Date: 2016/09/26 13:31:37 $");

  script_name(english:"Debian DLA-634-1 : dropbear security update");
  script_summary(english:"Checks dpkg output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that there were two issues in dropbear, a
lightweight SSH2 server and client :

  - CVE-2016-7406: Potential issues in exit message
    formatting.

  - CVE-2016-7407: Overflows when parsing OpenSSH's ASN.1
    key format.

For Debian 7 'Wheezy', this issue has been fixed in dropbear version
2012.55-1.3+deb7u1.

We recommend that you upgrade your dropbear 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/2016/09/msg00027.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/dropbear"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Upgrade the affected dropbear package."
  );
  script_set_attribute(attribute:"risk_factor", value:"High");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dropbear");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/09/26");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016 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:"dropbear", reference:"2012.55-1.3+deb7u1")) 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");