Vulnerabilities > CVE-2010-0014 - Improper Authentication vulnerability in Fedoraproject Sssd

047910
CVSS 3.7 - LOW
Attack vector
LOCAL
Attack complexity
HIGH
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
local
high complexity
fedoraproject
CWE-287
nessus

Summary

System Security Services Daemon (SSSD) before 1.0.1, when the krb5 auth_provider is configured but the KDC is unreachable, allows physically proximate attackers to authenticate, via an arbitrary password, to the screen-locking program on a workstation that has any user's Kerberos ticket-granting ticket (TGT); and might allow remote attackers to bypass intended access restrictions via vectors involving an arbitrary password in conjunction with a valid TGT.

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 familyFedora Local Security Checks
    NASL idFEDORA_2010-0413.NASL
    descriptionFixes CVE-2010-0014 - SSSD accepts any password when offline with a valid TGT available Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id47183
    published2010-07-01
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/47183
    titleFedora 12 : sssd-1.0.1-1.fc12 (2010-0413)
    code
    #%NASL_MIN_LEVEL 80502
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Fedora Security Advisory 2010-0413.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(47183);
      script_version("1.10");
      script_cvs_date("Date: 2019/08/02 13:32:30");
    
      script_cve_id("CVE-2010-0014");
      script_xref(name:"FEDORA", value:"2010-0413");
    
      script_name(english:"Fedora 12 : sssd-1.0.1-1.fc12 (2010-0413)");
      script_summary(english:"Checks rpm output for the updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Fedora host is missing a security update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "Fixes CVE-2010-0014 - SSSD accepts any password when offline with a
    valid TGT available
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Fedora security advisory. Tenable
    has attempted to automatically clean and format it as much as possible
    without introducing additional issues."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.redhat.com/show_bug.cgi?id=553631"
      );
      # https://lists.fedoraproject.org/pipermail/package-announce/2010-January/033822.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?1948f1d8"
      );
      script_set_attribute(attribute:"solution", value:"Update the affected sssd package.");
      script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:P/I:P/A:P");
      script_cwe_id(287);
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:sssd");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:12");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2010/01/12");
      script_set_attribute(attribute:"plugin_publication_date", value:"2010/07/01");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2010-2019 Tenable Network Security, Inc.");
      script_family(english:"Fedora Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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);
    release = get_kb_item("Host/RedHat/release");
    if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
    os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
    os_ver = os_ver[1];
    if (! ereg(pattern:"^12([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 12.x", "Fedora " + os_ver);
    
    if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
    
    flag = 0;
    if (rpm_check(release:"FC12", reference:"sssd-1.0.1-1.fc12")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
      else security_note(0);
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "sssd");
    }
    
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2010-0451.NASL
    descriptionFixes CVE-2010-0014 - SSSD accepts any password when offline with a valid TGT available Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id47185
    published2010-07-01
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/47185
    titleFedora 11 : sssd-1.0.1-1.fc11 (2010-0451)

Seebug

  • bulletinFamilyexploit
    descriptionBUGTRAQ ID: 37747 CVE ID: CVE-2010-0014 系统安全服务守护程序(SSSD)用于在Fedora系统中提供一些安全服务。 在配置了krb5 auth_provider但KDC不可到达的情况下,SSSD允许物理接触的本地用户通过任意口令认证到使用Kerberos TGT工作站上的受到锁屏保护的程序。 Fedora SSSD &lt; 1.0.1 厂商补丁: Fedora ------ 目前厂商已经发布了升级补丁以修复这个安全问题,请到厂商的主页下载: https://fedorahosted.org/sssd/wiki/Releases/Notes-1.0.1
    idSSV:18961
    last seen2017-11-19
    modified2010-01-19
    published2010-01-19
    reporterRoot
    titleFedora SSSD绕过Kerberos认证漏洞
  • bulletinFamilyexploit
    descriptionBugraq ID: 37747 CVE ID:CVE-2010-0014 Fedora是一款基于linux内核的发行版本。 当sssd配置使用Kerberos进行校验时(在域段中设置auth_provider = krb5),在如下条件下可接收任意密码作为合法密码使用: -系统离线的情况下,如KDC配置的krb5_kdcip选项没有启用到。 -尝试验证的用户在Kerberos realm中拥有一个合法TGT,并且在凭据缓存文件中设置了krb5_realm选项。 RedHat SSSD 1.0.0-2 RedHat SSSD 1.0.0-1 RedHat SSSD 0.99.1-1 RedHat Fedora 12 RedHat Fedora 11 RedHat SSSD 1.0.1-1已经修复此漏洞,建议用户下载使用: https://fedorahosted.org/sssd/wiki/Releases/Notes-1.0.1
    idSSV:18937
    last seen2017-11-19
    modified2010-01-13
    published2010-01-13
    reporterRoot
    sourcehttps://www.seebug.org/vuldb/ssvid-18937
    titleFedora SSSD Kerberos验证安全绕过漏洞