Vulnerabilities > CVE-2017-7507 - NULL Pointer Dereference vulnerability in GNU Gnutls

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3318-1. 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(100781);
  script_version("3.7");
  script_cvs_date("Date: 2019/09/18 12:31:47");

  script_cve_id("CVE-2017-7507", "CVE-2017-7869");
  script_xref(name:"USN", value:"3318-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 16.10 / 17.04 : gnutls26, gnutls28 vulnerabilities (USN-3318-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Hubert Kario discovered that GnuTLS incorrectly handled decoding a
status response TLS extension. A remote attacker could possibly use
this issue to cause GnuTLS to crash, resulting in a denial of service.
This issue only applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu
17.04. (CVE-2017-7507)

It was discovered that GnuTLS incorrectly handled decoding certain
OpenPGP certificates. A remote attacker could use this issue to cause
GnuTLS to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2017-7869).

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:"see_also",
    value:"https://usn.ubuntu.com/3318-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libgnutls26 and / or libgnutls30 packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls26");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libgnutls30");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:17.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/14");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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 (! preg(pattern:"^(14\.04|16\.04|16\.10|17\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04 / 16.04 / 16.10 / 17.04", "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:"14.04", pkgname:"libgnutls26", pkgver:"2.12.23-12ubuntu2.8")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libgnutls30", pkgver:"3.4.10-4ubuntu1.3")) flag++;
if (ubuntu_check(osver:"16.10", pkgname:"libgnutls30", pkgver:"3.5.3-5ubuntu1.2")) flag++;
if (ubuntu_check(osver:"17.04", pkgname:"libgnutls30", pkgver:"3.5.6-4ubuntu4.1")) 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, "libgnutls26 / libgnutls30");
}

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text is (C) Scientific Linux.
#

include("compat.inc");

if (description)
{
  script_id(102642);
  script_version("3.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/02/25");

  script_cve_id("CVE-2016-7444", "CVE-2017-5334", "CVE-2017-5335", "CVE-2017-5336", "CVE-2017-5337", "CVE-2017-7507", "CVE-2017-7869");

  script_name(english:"Scientific Linux Security Update : gnutls on SL7.x x86_64 (20170801)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Scientific Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The following packages have been upgraded to a later upstream version:
gnutls (3.3.26).

Security Fix(es) :

  - A double-free flaw was found in the way GnuTLS parsed
    certain X.509 certificates with Proxy Certificate
    Information extension. An attacker could create a
    specially crafted certificate which, when processed by
    an application compiled against GnuTLS, could cause that
    application to crash. (CVE-2017-5334)

  - Multiple flaws were found in the way gnutls processed
    OpenPGP certificates. An attacker could create specially
    crafted OpenPGP certificates which, when parsed by
    gnutls, would cause it to crash. (CVE-2017-5335,
    CVE-2017-5336, CVE-2017-5337, CVE-2017-7869)

  - A NULL pointer dereference flaw was found in the way
    GnuTLS processed ClientHello messages with
    status_request extension. A remote attacker could use
    this flaw to cause an application compiled with GnuTLS
    to crash. (CVE-2017-7507)

  - A flaw was found in the way GnuTLS validated
    certificates using OCSP responses. This could falsely
    report a certificate as valid under certain
    circumstances. (CVE-2016-7444)"
  );
  # https://listserv.fnal.gov/scripts/wa.exe?A2=ind1708&L=scientific-linux-errata&F=&S=&P=10261
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f99f9a2e"
  );
  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:P/A:P");
  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_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls-c++");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls-dane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fermilab:scientific_linux:gnutls-utils");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:fermilab:scientific_linux");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/09/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Scientific Linux Local Security Checks");

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

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Scientific Linux " >!< release) audit(AUDIT_HOST_NOT, "running Scientific Linux");
os_ver = pregmatch(pattern: "Scientific Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Scientific Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Scientific Linux 7.x", "Scientific Linux " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

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


flag = 0;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-3.3.26-9.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-c++-3.3.26-9.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-dane-3.3.26-9.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-debuginfo-3.3.26-9.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-devel-3.3.26-9.el7")) flag++;
if (rpm_check(release:"SL7", cpu:"x86_64", reference:"gnutls-utils-3.3.26-9.el7")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gnutls / gnutls-c++ / gnutls-dane / gnutls-debuginfo / gnutls-devel / etc");
}

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103061);
  script_version("3.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/04");

  script_cve_id(
    "CVE-2016-7444",
    "CVE-2017-5334",
    "CVE-2017-5335",
    "CVE-2017-5336",
    "CVE-2017-5337",
    "CVE-2017-7507"
  );

  script_name(english:"EulerOS 2.0 SP1 : gnutls (EulerOS-SA-2017-1203)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the gnutls packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - A double-free flaw was found in the way GnuTLS parsed
    certain X.509 certificates with Proxy Certificate
    Information extension. An attacker could create a
    specially-crafted certificate which, when processed by
    an application compiled against GnuTLS, could cause
    that application to crash. (CVE-2017-5334)

  - Multiple flaws were found in the way gnutls processed
    OpenPGP certificates. An attacker could create
    specially crafted OpenPGP certificates which, when
    parsed by gnutls, would cause it to crash.
    (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337,
    CVE-2017-7869)

  - A null pointer dereference flaw was found in the way
    GnuTLS processed ClientHello messages with
    status_request extension. A remote attacker could use
    this flaw to cause an application compiled with GnuTLS
    to crash. (CVE-2017-7507)

  - A flaw was found in the way GnuTLS validated
    certificates using OCSP responses. This could falsely
    report a certificate as valid under certain
    circumstances. (CVE-2016-7444)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2017-1203
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?91370497");
  script_set_attribute(attribute:"solution", value:
"Update the affected gnutls 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:"patch_publication_date", value:"2017/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls-c++");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls-dane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnutls-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  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);

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(1)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP1");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP1", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) 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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["gnutls-3.3.26-9",
        "gnutls-c++-3.3.26-9",
        "gnutls-dane-3.3.26-9",
        "gnutls-devel-3.3.26-9",
        "gnutls-utils-3.3.26-9"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"1", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gnutls");
}

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-3884. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100852);
  script_version("3.8");
  script_cvs_date("Date: 2018/11/10 11:49:38");

  script_cve_id("CVE-2017-7507");
  script_xref(name:"DSA", value:"3884");

  script_name(english:"Debian DSA-3884-1 : gnutls28 - 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-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Hubert Kario discovered that GnuTLS, a library implementing the TLS
and SSL protocols, does not properly decode a status response TLS
extension, allowing a remote attacker to cause an application using
the GnuTLS library to crash (denial of service)."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864560"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/gnutls28"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2017/dsa-3884"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the gnutls28 packages.

For the stable distribution (jessie), this problem has been fixed in
version 3.3.8-6+deb8u6.

For the upcoming stable distribution (stretch), this problem has been
fixed in version 3.5.8-5+deb9u1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls28");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/19");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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:"gnutls-bin", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"gnutls-doc", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"guile-gnutls", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"libgnutls-deb0-28", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"libgnutls-openssl27", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"libgnutls28-dbg", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"libgnutls28-dev", reference:"3.3.8-6+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"libgnutlsxx28", reference:"3.3.8-6+deb8u6")) 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");

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201710-15.
#
# The advisory text is Copyright (C) 2001-2018 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(103850);
  script_version("3.2");
  script_cvs_date("Date: 2018/06/07 13:15:38");

  script_cve_id("CVE-2017-7507");
  script_xref(name:"GLSA", value:"201710-15");

  script_name(english:"GLSA-201710-15 : GnuTLS: Denial of Service");
  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-201710-15
(GnuTLS: Denial of Service)

    A NULL pointer dereference while decoding a status response TLS
      extension with valid contents was discovered in GnuTLS.
  
Impact :

    A remote attacker could possibly cause a Denial of Service condition.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201710-15"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All GnuTLS users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=net-libs/gnutls-3.5.13'
    Packages which depend on this library may need to be recompiled. Tools
      such as revdep-rebuild may assist in identifying some of these packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

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

  script_set_attribute(attribute:"patch_publication_date", value:"2017/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/16");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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:"net-libs/gnutls", unaffected:make_list("ge 3.5.13"), vulnerable:make_list("lt 3.5.13"))) 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, "GnuTLS");
}

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2017:2292 and 
# CentOS Errata and Security Advisory 2017:2292 respectively.
#

include("compat.inc");

if (description)
{
  script_id(102759);
  script_version("3.7");
  script_cvs_date("Date: 2019/12/31");

  script_cve_id("CVE-2016-7444", "CVE-2017-5334", "CVE-2017-5335", "CVE-2017-5336", "CVE-2017-5337", "CVE-2017-7507", "CVE-2017-7869");
  script_xref(name:"RHSA", value:"2017:2292");

  script_name(english:"CentOS 7 : gnutls (CESA-2017:2292)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for gnutls is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS)
library, which implements cryptographic algorithms and protocols such
as SSL, TLS, and DTLS.

The following packages have been upgraded to a later upstream version:
gnutls (3.3.26). (BZ#1378373)

Security Fix(es) :

* A double-free flaw was found in the way GnuTLS parsed certain X.509
certificates with Proxy Certificate Information extension. An attacker
could create a specially crafted certificate which, when processed by
an application compiled against GnuTLS, could cause that application
to crash. (CVE-2017-5334)

* Multiple flaws were found in the way gnutls processed OpenPGP
certificates. An attacker could create specially crafted OpenPGP
certificates which, when parsed by gnutls, would cause it to crash.
(CVE-2017-5335, CVE-2017-5336, CVE-2017-5337, CVE-2017-7869)

* A NULL pointer dereference flaw was found in the way GnuTLS
processed ClientHello messages with status_request extension. A remote
attacker could use this flaw to cause an application compiled with
GnuTLS to crash. (CVE-2017-7507)

* A flaw was found in the way GnuTLS validated certificates using OCSP
responses. This could falsely report a certificate as valid under
certain circumstances. (CVE-2016-7444)

The CVE-2017-7507 issue was discovered by Hubert Kario (Red Hat QE
BaseOS Security team).

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section."
  );
  # https://lists.centos.org/pipermail/centos-cr-announce/2017-August/004178.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?5f298e83"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected gnutls 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:"cvss_score_source", value:"CVE-2017-5334");
  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:centos:centos:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gnutls-c++");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gnutls-dane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gnutls-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gnutls-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/09/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/25");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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);
release = get_kb_item("Host/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/rpm-list")) 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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gnutls-3.3.26-9.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gnutls-c++-3.3.26-9.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gnutls-dane-3.3.26-9.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gnutls-devel-3.3.26-9.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"gnutls-utils-3.3.26-9.el7")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils");
}