Vulnerabilities > CVE-2011-2701 - Improper Authentication vulnerability in Freeradius 2.1.11

047910
CVSS 5.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
NONE
network
freeradius
CWE-287
nessus
NVD
Published: 2011-08-04
Updated: 2018-10-09

Summary

The ocsp_check function in rlm_eap_tls.c in FreeRADIUS 2.1.11, when OCSP is enabled, does not properly parse replies from OCSP responders, which allows remote attackers to bypass authentication by using the EAP-TLS protocol with a revoked X.509 client certificate.

Vulnerable Configurations

Part Description Count
Application
Freeradius
1

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 familyMandriva Local Security Checks
    NASL idMANDRIVA_MDVSA-2012-047.NASL
    descriptionA vulnerability has been found and corrected in freeradius : The ocsp_check function in rlm_eap_tls.c in FreeRADIUS 2.1.11, when OCSP is enabled, does not properly parse replies from OCSP responders, which allows remote attackers to bypass authentication by using the EAP-TLS protocol with a revoked X.509 client certificate (CVE-2011-2701). The updated packages have been patched to correct this issue.
    last seen2020-06-01
    modified2020-06-02
    plugin id61948
    published2012-09-06
    reporterThis script is Copyright (C) 2012-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/61948
    titleMandriva Linux Security Advisory : freeradius (MDVSA-2012:047)
    code
    #%NASL_MIN_LEVEL 80502

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Mandriva Linux Security Advisory MDVSA-2012:047. 
# The text itself is copyright (C) Mandriva S.A.
#

include("compat.inc");

if (description)
{
  script_id(61948);
  script_version("1.7");
  script_cvs_date("Date: 2019/08/02 13:32:54");

  script_cve_id("CVE-2011-2701");
  script_bugtraq_id(48880);
  script_xref(name:"MDVSA", value:"2012:047");

  script_name(english:"Mandriva Linux Security Advisory : freeradius (MDVSA-2012:047)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Mandriva Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"A vulnerability has been found and corrected in freeradius :

The ocsp_check function in rlm_eap_tls.c in FreeRADIUS 2.1.11, when
OCSP is enabled, does not properly parse replies from OCSP responders,
which allows remote attackers to bypass authentication by using the
EAP-TLS protocol with a revoked X.509 client certificate
(CVE-2011-2701).

The updated packages have been patched to correct this issue."
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-krb5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-postgresql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-sqlite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-unixODBC");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:freeradius-web");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:lib64freeradius-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:lib64freeradius1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:libfreeradius-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:libfreeradius1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2011");

  script_set_attribute(attribute:"patch_publication_date", value:"2012/04/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/09/06");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2012-2019 Tenable Network Security, Inc.");
  script_family(english:"Mandriva Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/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);
if (!get_kb_item("Host/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);


flag = 0;
if (rpm_check(release:"MDK2011", reference:"freeradius-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-krb5-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-ldap-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-mysql-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-postgresql-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-sqlite-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-unixODBC-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", reference:"freeradius-web-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", cpu:"x86_64", reference:"lib64freeradius-devel-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", cpu:"x86_64", reference:"lib64freeradius1-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", cpu:"i386", reference:"libfreeradius-devel-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2011", cpu:"i386", reference:"libfreeradius1-2.1.11-1.1-mdv2011.0", yank:"mdv")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201311-09.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201311-09 (FreeRADIUS: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in FreeRADIUS. Please review the CVE identifiers referenced below for details. Impact : A remote attacker could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id70869
    published2013-11-13
    reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/70869
    titleGLSA-201311-09 : FreeRADIUS: Multiple vulnerabilities
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201311-09.
#
# The advisory text is Copyright (C) 2001-2015 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(70869);
  script_version("1.6");
  script_cvs_date("Date: 2018/07/12 19:01:15");

  script_cve_id("CVE-2010-3696", "CVE-2010-3697", "CVE-2011-2701", "CVE-2012-3547");
  script_bugtraq_id(48880, 55483);
  script_xref(name:"GLSA", value:"201311-09");

  script_name(english:"GLSA-201311-09 : FreeRADIUS: 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-201311-09
(FreeRADIUS: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in FreeRADIUS. Please
      review the CVE identifiers referenced below for details.
  
Impact :

    A remote attacker could possibly execute arbitrary code with the
      privileges of the process or cause a Denial of Service condition.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201311-09"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All FreeRADIUS users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=net-dialup/freeradius-2.2.0'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:freeradius");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2013/11/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/11/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
  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-dialup/freeradius", unaffected:make_list("ge 2.2.0"), vulnerable:make_list("lt 2.2.0"))) flag++;

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

References