Ubuntu 14.04 LTS / 16.04 LTS : Irssi vulnerabilities (USN-3184-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3184-1. 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(96953);
  script_version("3.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/03");

  script_cve_id(
    "CVE-2016-7553",
    "CVE-2017-5193",
    "CVE-2017-5194",
    "CVE-2017-5195",
    "CVE-2017-5196",
    "CVE-2017-5356"
  );
  script_xref(name:"USN", value:"3184-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : Irssi vulnerabilities (USN-3184-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-3184-1 advisory.

    It was discovered that the Irssi buf.pl script set incorrect permissions. A local attacker could use this
    issue to retrieve another user's window contents. (CVE-2016-7553)

    Joseph Bisch discovered that Irssi incorrectly handled comparing nicks. A remote attacker could use this
    issue to cause Irssi to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2017-5193)

    It was discovered that Irssi incorrectly handled invalid nick messages. A remote attacker could use this
    issue to cause Irssi to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2017-5194)

    Joseph Bisch discovered that Irssi incorrectly handled certain incomplete control codes. A remote attacker
    could use this issue to cause Irssi to crash, resulting in a denial of service, or possibly execute
    arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5195)

    Hanno Bck and Joseph Bisch discovered that Irssi incorrectly handled certain incomplete character
    sequences. A remote attacker could use this issue to cause Irssi to crash, resulting in a denial of
    service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5196)

    Hanno Bck discovered that Irssi incorrectly handled certain format strings. A remote attacker could use
    this issue to cause Irssi to crash, resulting in a denial of service. (CVE-2017-5356)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-3184-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected irssi and / or irssi-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-7553");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/02/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/02/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/02/02");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:irssi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:irssi-dev");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2017-2025 Canonical, Inc. / NASL script (C) 2017-2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release || '16.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '14.04', 'pkgname': 'irssi', 'pkgver': '0.8.15-5ubuntu3.1', 'cves': ['CVE-2016-7553', 'CVE-2017-5193', 'CVE-2017-5194', 'CVE-2017-5356']},
    {'osver': '14.04', 'pkgname': 'irssi-dev', 'pkgver': '0.8.15-5ubuntu3.1', 'cves': ['CVE-2016-7553', 'CVE-2017-5193', 'CVE-2017-5194', 'CVE-2017-5356']},
    {'osver': '16.04', 'pkgname': 'irssi', 'pkgver': '0.8.19-1ubuntu1.3', 'cves': ['CVE-2016-7553', 'CVE-2017-5193', 'CVE-2017-5194', 'CVE-2017-5195', 'CVE-2017-5196', 'CVE-2017-5356']},
    {'osver': '16.04', 'pkgname': 'irssi-dev', 'pkgver': '0.8.19-1ubuntu1.3', 'cves': ['CVE-2016-7553', 'CVE-2017-5193', 'CVE-2017-5194', 'CVE-2017-5195', 'CVE-2017-5196', 'CVE-2017-5356']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'irssi / irssi-dev');
}