Vulnerabilities > CVE-2010-2075 - Improper Input Validation vulnerability in Unrealircd 3.2.8.1

#%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");
}

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

include("compat.inc");

if (description)
{
 script_id(46882);
 script_version("1.15");
 script_cvs_date("Date: 2018/11/28 22:47:41");

 script_cve_id("CVE-2010-2075");
 script_bugtraq_id(40820);
 
 script_name(english:"UnrealIRCd Backdoor Detection");
 script_summary(english:"IRCD version");
 
 script_set_attribute(attribute:"synopsis", value:
"The remote IRC server contains a backdoor.");
 script_set_attribute(attribute:"description", value:
"The remote IRC server is a version of UnrealIRCd with a backdoor
that allows an attacker to execute arbitrary code on the affected
host.");
 script_set_attribute(attribute:"see_also", value:"https://seclists.org/fulldisclosure/2010/Jun/277");
 script_set_attribute(attribute:"see_also", value:"https://seclists.org/fulldisclosure/2010/Jun/284");
 script_set_attribute(attribute:"see_also", value:"http://www.unrealircd.com/txt/unrealsecadvisory.20100612.txt");
 script_set_attribute(attribute:"solution", value:
"Re-download the software, verify it using the published MD5 / SHA1
checksums, and re-install it.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
 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:"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:"vuln_publication_date", value:"2010/06/12");
 script_set_attribute(attribute:"patch_publication_date", value:"2010/06/12");
 script_set_attribute(attribute:"plugin_publication_date", value:"2010/06/14");

 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_set_attribute(attribute:"cpe", value:"cpe:/a:unrealircd:unrealircd");
 script_end_attributes();

 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2010-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
 script_family(english:"Backdoors");

 script_dependencie("find_service1.nasl", "find_service2.nasl", "ircd.nasl");
 script_require_ports("Services/irc", 6667);
 exit(0);
}

#

include("global_settings.inc");
include("misc_func.inc");
include("data_protection.inc");


port = get_service(svc:"irc", default:6667, exit_on_fail:TRUE);

key = string("irc/banner/", port);
banner = get_kb_item(key);
if (!banner) exit(0, "Could not talk to the IRC server on port "+port+".");


soc = open_sock_tcp(port);
if (! soc) exit(1, "Can't open socket on port "+port+".");

repeat {
 r = recv_line(socket:soc, length:4096);
 n++;
 if ( n > 1024 ) exit(0, "Unexpected answer from the remote IRC server on port "+port+".");
} until (isnull(r) );

 send(socket:soc, data:'AB; for i in `ls /proc/$PPID/fd|sort -nr` ; do id >&$i; done ;');
 if ( get_port_transport(port) > ENCAPS_IP && defined_func("socket_reset_ssl") ) socket_reset_ssl(soc);
r = recv_line(socket:soc, length:4096);
if ( "uid=" >< r )
{
  if (data_protection::is_sanitize_username_enabled())
  {
    report = '\nCommand execution successful';
  }
  else
  {
    report = '\nThe remote IRC server is running as :\n\n' + r;
  }

  security_hole(port:port, extra:report);
}