Vulnerabilities > CVE-2009-4893 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Unrealircd

#%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 201006-21.
#
# 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(47016);
  script_version("1.17");
  script_cvs_date("Date: 2019/08/02 13:32:45");

  script_cve_id("CVE-2009-4893", "CVE-2010-2075");
  script_bugtraq_id(40820);
  script_xref(name:"GLSA", value:"201006-21");

  script_name(english:"GLSA-201006-21 : UnrealIRCd: Multiple vulnerabilities");
  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-201006-21
(UnrealIRCd: Multiple vulnerabilities)

    Multiple vulnerabilities have been reported in UnrealIRCd:
    The vendor reported a buffer overflow in the user authorization
    code (CVE-2009-4893).
    The vendor reported that the distributed source code of UnrealIRCd
    was compromised and altered to include a system() call that could be
    called with arbitrary user input (CVE-2010-2075).
  
Impact :

    A remote attacker could exploit these vulnerabilities to cause the
    execution of arbitrary commands with the privileges of the user running
    UnrealIRCd, or a Denial of Service condition. NOTE: By default
    UnrealIRCd on Gentoo is run with the privileges of the 'unrealircd'
    user.
  
Workaround :

    There is no known workaround at this time."
  );
  # http://www.unrealircd.com/txt/unrealsecadvisory.20090413.txt
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.unrealircd.org/txt/unrealsecadvisory.20090413.txt"
  );
  # http://www.unrealircd.com/txt/unrealsecadvisory.20100612.txt
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.unrealircd.org/txt/unrealsecadvisory.20100612.txt"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201006-21"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All UnrealIRCd users should upgrade to the latest version:
    # emerge --sync
    # emerge --ask --oneshot --verbose '>=net-irc/unrealircd-3.2.8.1-r1'"
  );
  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:F/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'UnrealIRCD 3.2.8.1 Backdoor Command Execution');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'White_Phosphorus');

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

  script_set_attribute(attribute:"patch_publication_date", value:"2010/06/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/06/15");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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-irc/unrealircd", unaffected:make_list("ge 3.2.8.1-r1"), vulnerable:make_list("lt 3.2.8.1-r1"))) flag++;

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