Vulnerabilities > CVE-2005-0366 - Inadequate Encryption Strength vulnerability in Gnupg

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(19349);
  script_version("1.17");
  script_cvs_date("Date: 2019/08/02 13:32:37");

  script_cve_id("CVE-2005-0366");
  script_xref(name:"CERT", value:"303094");

  script_name(english:"FreeBSD : gnupg -- OpenPGP symmetric encryption vulnerability (8375a73f-01bf-11da-bc08-0001020eed82)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Serge Mister and Robert Zuccherato reports that the OpenPGP protocol
is vulnerable to a cryptographic attack when using symmetric
encryption in an automated way.

David Shaw reports about the impact :

This attack, while very significant from a cryptographic point of
view, is not generally effective in the real world. To be specific,
unless you have your OpenPGP program set up as part of an automated
system to accept encrypted messages, decrypt them, and then provide a
response to the submitter, then this does not affect you at all.

Note that the fix in GnuPG does note completely eliminate the
potential problem :

These patches disable a portion of the OpenPGP protocol that the
attack is exploiting. This change should not be user visible. With the
patch in place, this attack will not work using a public-key encrypted
message. It will still work using a passphrase-encrypted message."
  );
  # http://eprint.iacr.org/2005/033
  script_set_attribute(
    attribute:"see_also",
    value:"https://eprint.iacr.org/2005/033"
  );
  # http://lists.gnupg.org/pipermail/gnupg-announce/2005q1/000191.html
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.gnupg.org/pipermail/gnupg-announce/2005q1/000191.html"
  );
  # http://www.pgp.com/newsroom/ctocorner/openpgp.html
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.symantec.com/business/theme.jsp?themeid=pgp"
  );
  # https://vuxml.freebsd.org/freebsd/8375a73f-01bf-11da-bc08-0001020eed82.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f330b2a6"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:gnupg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:p5-Crypt-OpenPGP");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:pgp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2005/02/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2005/07/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/08/01");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2005-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"gnupg<1.4.1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"p5-Crypt-OpenPGP<=1.03")) flag++;
if (pkg_test(save_report:TRUE, pkg:"pgp>=3.0")) flag++;

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

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200503-29.
#
# The advisory text is Copyright (C) 2001-2015 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(17616);
  script_version("1.14");
  script_cvs_date("Date: 2019/08/02 13:32:42");

  script_cve_id("CVE-2005-0366");
  script_xref(name:"CERT", value:"303094");
  script_xref(name:"GLSA", value:"200503-29");

  script_name(english:"GLSA-200503-29 : GnuPG: OpenPGP protocol attack");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-200503-29
(GnuPG: OpenPGP protocol attack)

    A flaw has been identified in an integrity checking mechanism of
    the OpenPGP protocol.
  
Impact :

    An automated system using GnuPG that allows an attacker to
    repeatedly discover the outcome of an integrity check (perhaps by
    observing the time required to return a response, or via overly verbose
    error messages) could theoretically reveal a small portion of
    plaintext.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200503-29"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All GnuPG users should upgrade to the latest version:
    # emerge --sync
    # emerge --ask --oneshot --verbose '>=app-crypt/gnupg-1.4.1'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:gnupg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2005/03/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/03/25");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2005-2019 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"app-crypt/gnupg", unaffected:make_list("ge 1.4.1"), vulnerable:make_list("lt 1.4.1"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "GnuPG");
}

#%NASL_MIN_LEVEL 80502

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Mandrake Linux Security Advisory MDKSA-2005:057. 
# The text itself is copyright (C) Mandriva S.A.
#

include("compat.inc");

if (description)
{
  script_id(17334);
  script_version ("1.16");
  script_cvs_date("Date: 2019/08/02 13:32:47");

  script_cve_id("CVE-2005-0366");
  script_xref(name:"CERT", value:"303094");
  script_xref(name:"MDKSA", value:"2005:057");

  script_name(english:"Mandrake Linux Security Advisory : gnupg (MDKSA-2005:057)");
  script_summary(english:"Checks rpm output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Mandrake Linux host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The OpenPGP protocol is vulnerable to a timing-attack in order to gain
plain text from cipher text. The timing difference appears as a side
effect of the so-called 'quick scan' and is only exploitable on
systems that accept an arbitrary amount of cipher text for automatic
decryption.

The updated packages have been patched to disable the quick check for
all public key-encrypted messages and files."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.pgp.com/library/ctocorner/openpgp.html"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected gnupg package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:gnupg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:10.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:10.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:9.2");

  script_set_attribute(attribute:"patch_publication_date", value:"2005/03/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/03/16");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2005-2019 Tenable Network Security, Inc.");
  script_family(english:"Mandriva Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);


flag = 0;
if (rpm_check(release:"MDK10.0", reference:"gnupg-1.2.4-1.1.100mdk", yank:"mdk")) flag++;

if (rpm_check(release:"MDK10.1", reference:"gnupg-1.2.4-1.1.101mdk", yank:"mdk")) flag++;

if (rpm_check(release:"MDK9.2", reference:"gnupg-1.2.3-3.2.92mdk", yank:"mdk")) flag++;


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

#%NASL_MIN_LEVEL 80502

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-170-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(20577);
  script_version("1.14");
  script_cvs_date("Date: 2019/08/02 13:33:00");

  script_cve_id("CVE-2005-0366");
  script_xref(name:"USN", value:"170-1");

  script_name(english:"Ubuntu 4.10 / 5.04 : gnupg vulnerability (USN-170-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Serge Mister and Robert Zuccherato discovered a weakness of the
symmetrical encryption algorithm of gnupg. When decrypting a message,
gnupg uses a feature called 'quick scan'; this can quickly check
whether the key that is used for decryption is (probably) the right
one, so that wrong keys can be determined quickly without decrypting
the whole message.

A failure of the quick scan will be determined much faster than a
successful one. Mister/Zuccherato demonstrated that this timing
difference can be exploited to an attack which allows an attacker to
decrypt parts of an encrypted message if an 'oracle' is available, i.
e. an automatic system that receives random encrypted messages from
the attacker and answers whether it passes the quick scan check.

However, since the attack requires a huge amount of oracle answers
(about 32.000 for every 16 bytes of ciphertext), this attack is mostly
theoretical. It does not have any impact on human operation of gnupg
and is not believed to be exploitable in practice.

The updated packages disable the quick check, which renders this
timing attack impossible.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(attribute:"solution", value:"Update the affected gnupg package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gnupg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:4.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:5.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2005/08/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/01/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2005-2019 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! ereg(pattern:"^(4\.10|5\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 4.10 / 5.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"4.10", pkgname:"gnupg", pkgver:"1.2.4-4ubuntu2.1")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"gnupg", pkgver:"1.2.5-3ubuntu5.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gnupg");
}