Vulnerabilities > CVE-2011-3298 - Improper Authentication vulnerability in Cisco products

047910
CVSS 0.0 - NONE
Attack vector
UNKNOWN
Attack complexity
UNKNOWN
Privileges required
UNKNOWN
Confidentiality impact
UNKNOWN
Integrity impact
UNKNOWN
Availability impact
UNKNOWN

Summary

Cisco Adaptive Security Appliances (ASA) 5500 series devices, and the ASA Services module in Cisco Catalyst 6500 series devices, with software 7.0 before 7.0(8.13), 7.1 and 7.2 before 7.2(5.3), 8.0 before 8.0(5.24), 8.1 before 8.1(2.50), 8.2 before 8.2(5), 8.3 before 8.3(2.18), 8.4 before 8.4(1.10), and 8.5 before 8.5(1.1) and Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7) allow remote attackers to bypass authentication via a crafted TACACS+ reply, aka Bug IDs CSCto40365 and CSCto74274.

Vulnerable Configurations

Part Description Count
OS
Cisco
73
Hardware
Cisco
4
Application
Cisco
64

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.

Nessus

NASL familyCISCO
NASL idCISCO-SA-20111005-ASA.NASL
descriptionThe remote Cisco ASA is missing a security patch and may be affected by the following issues : - When MSN IM inspection is enabled, inspecting malformed transit traffic could cause the device to reload. (CVE-2011-3304) - TACACS+ authentication can be bypassed by an attacker with access between the ASA and the TACACS+ server. (CVE-2011-3298) - Four DoS vulnerabilities in the SunRPC inspection engine can be triggered by specially crafted UDP traffic, causing the device to reload. (CVE-2011-3299, CVE-2011-3300, CVE-2011-3301, CVE-2011-3302) - When ILS inspection is enabled, inspecting malformed transit traffic could cause the device to reload, resulting in a sustained DoS condition. (CVE-2011-3303)
last seen2020-06-01
modified2020-06-02
plugin id56631
published2011-10-25
reporterThis script is Copyright (C) 2011-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/56631
titleCisco ASA 5500 Series Multiple Vulnerabilities (cisco-sa-20111005-asa)
code
#
# (C) Tenable Network Security, Inc.
#


include("compat.inc");


if (description)
{
  script_id(56631);
  script_version("1.7");
  script_cvs_date("Date: 2018/11/15 20:50:20");

  script_cve_id(
    "CVE-2011-3298",
    "CVE-2011-3299",
    "CVE-2011-3300",
    "CVE-2011-3301",
    "CVE-2011-3302",
    "CVE-2011-3303",
    "CVE-2011-3304"
  );
  script_bugtraq_id(49951, 49952, 49956);
  script_xref(name:"CISCO-BUG-ID", value:"CSCtl67486");
  script_xref(name:"CISCO-BUG-ID", value:"CSCto40365");
  script_xref(name:"CISCO-BUG-ID", value:"CSCto92380");
  script_xref(name:"CISCO-BUG-ID", value:"CSCto92398");
  script_xref(name:"CISCO-BUG-ID", value:"CSCtq06062");
  script_xref(name:"CISCO-BUG-ID", value:"CSCtq06065");
  script_xref(name:"CISCO-BUG-ID", value:"CSCtq57697");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20111005-asa");

  script_name(english:"Cisco ASA 5500 Series Multiple Vulnerabilities (cisco-sa-20111005-asa)");
  script_summary(english:"Checks the version of the remote ASA.");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The remote security device is missing a vendor-supplied security
patch."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The remote Cisco ASA is missing a security patch and may be affected
by the following issues :

  - When MSN IM inspection is enabled, inspecting malformed
    transit traffic could cause the device to reload.
    (CVE-2011-3304)

  - TACACS+ authentication can be bypassed by an attacker
    with access between the ASA and the TACACS+ server.
    (CVE-2011-3298)

  - Four DoS vulnerabilities in the SunRPC inspection
    engine can be triggered by specially crafted
    UDP traffic, causing the device to reload.
   (CVE-2011-3299, CVE-2011-3300, CVE-2011-3301, CVE-2011-3302)

  - When ILS inspection is enabled, inspecting malformed
    transit traffic could cause the device to reload,
    resulting in a sustained DoS condition. (CVE-2011-3303)"
  );
  script_set_attribute(attribute:"see_also",value:"http://www.nessus.org/u?4d707431");
  script_set_attribute(
    attribute:"solution",
    value:"Apply the appropriate Cisco ASA patch (see plugin output)."
  );
 script_set_cvss_base_vector("CVSS2#AV:A/AC:M/Au:N/C:C/I:C/A:C");
 script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:"vuln_publication_date", value:"2011/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/10/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/10/25");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:cisco:asa_5500");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:adaptive_security_appliance_software");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CISCO");

  script_copyright(english:"This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.");
 
  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/Cisco/ASA", "Host/Cisco/ASA/model");
  exit(0);
}

include("cisco_func.inc");
include("audit.inc");

asa = get_kb_item_or_exit('Host/Cisco/ASA');
model = get_kb_item_or_exit('Host/Cisco/ASA/model');
ver = extract_asa_version(asa);
if (isnull(ver)) audit(AUDIT_FN_FAIL, 'extract_asa_version');

if (model !~ '^55[0-9][0-9]')
  audit(AUDIT_HOST_NOT, 'ASA 5500');

# first check 7.1 (the recommendation is to migrate to 7.2 and upgrade)
if (ver =~ '^7\\.1($|[^0-9])')
{
  report =
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : 7.2(5.4)\n';
  security_hole(port:0, extra:report);
  exit(0);
}

# then check 8.1 (the recommendation is to migrate to 8.2 or later and upgrade)
if (ver =~ '^8\\.1($|[^0-9])')
{
  report =
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : migrate to 8.2 or later and apply patches\n';
  security_hole(port:0, extra:report);
  exit(0);
}

# compare the ASA version versus all recommended releases.  The
# comparison is only made if the major versions match up
recommended_releases = make_list('7.0(8.13)', '7.2(5.4)', '8.0(5.25)', '8.2(5.11)', '8.3(2.23)', '8.4(2.7)', '8.5(1.1)');
foreach patch (recommended_releases)
{
  if (check_asa_release(version:ver, patched:patch))
  {
    report =
      '\n  Installed release : ' + ver +
      '\n  Fixed release     : ' + patch + '\n';
    security_hole(port:0, extra:report);
    exit(0);
  }
}

audit(AUDIT_INST_VER_NOT_VULN, 'ASA', ver);