Vulnerabilities > CVE-2015-3420 - Improper Certificate Validation vulnerability in multiple products

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2015-7159.
#

include("compat.inc");

if (description)
{
  script_id(83549);
  script_version("2.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2015-3420");
  script_xref(name:"FEDORA", value:"2015-7159");

  script_name(english:"Fedora 20 : dovecot-2.2.16-2.fc20 (2015-7159)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"fixes CVE-2015-3420: SSL/TLS handshake failures leading to a crash of
the login process

  - dovecot updated to 2.2.16

    - auth: Don't crash if master user login is attempted
      without any configured master=yes passdbs

  - Parsing UTF-8 text for mails could have caused broken
    results sometimes if buffering was split in the middle
    of a UTF-8 character. This affected at least searching
    messages.

  - String sanitization for some logged output wasn't done
    properly: UTF-8 text could have been truncated wrongly
    or the truncation may not have happened at all.

  - fts-lucene: Lookups from virtual mailbox consisting of
    over 32 physical mailboxes could have caused crashes.

  - dovecot updated to 2.2.16

    - auth: Don't crash if master user login is attempted
      without any configured master=yes passdbs

  - Parsing UTF-8 text for mails could have caused broken
    results sometimes if buffering was split in the middle
    of a UTF-8 character. This affected at least searching
    messages.

  - String sanitization for some logged output wasn't done
    properly: UTF-8 text could have been truncated wrongly
    or the truncation may not have happened at all.

  - fts-lucene: Lookups from virtual mailbox consisting of
    over 32 physical mailboxes could have caused crashes.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora 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://bugzilla.redhat.com/show_bug.cgi?id=1216057"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?8ec481f0"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected dovecot package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/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:fedoraproject:fedora:dovecot");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:20");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/05/20");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2020 Tenable Network Security, Inc.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^20([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 20.x", "Fedora " + 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 ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC20", reference:"dovecot-2.2.16-2.fc20")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "dovecot");
}