Vulnerabilities > CVE-2017-12158 - Cross-site Scripting vulnerability in multiple products

047910
CVSS 3.5 - LOW
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
SINGLE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
network
redhat
keycloak
CWE-79
nessus

Summary

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Embedding Scripts in Non-Script Elements
    This attack is a form of Cross-Site Scripting (XSS) where malicious scripts are embedded in elements that are not expected to host scripts such as image tags (<img>), comments in XML documents (< !-CDATA->), etc. These tags may not be subject to the same input validation, output validation, and other content filtering and checking routines, so this can create an opportunity for an attacker to tunnel through the application's elements and launch a XSS attack through other elements. As with all remote attacks, it is important to differentiate the ability to launch an attack (such as probing an internal network for unpatched servers) and the ability of the remote attacker to collect and interpret the output of said attack.
  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Cross-Site Scripting in Error Pages
    An attacker distributes a link (or possibly some other query structure) with a request to a third party web server that is malformed and also contains a block of exploit code in order to have the exploit become live code in the resulting error page. When the third party web server receives the crafted request and notes the error it then creates an error message that echoes the malformed message, including the exploit. Doing this converts the exploit portion of the message into to valid language elements that are executed by the viewing browser. When a victim executes the query provided by the attacker the infected error message error message is returned including the exploit code which then runs in the victim's browser. XSS can result in execution of code as well as data leakage (e.g. session cookies can be sent to the attacker). This type of attack is especially dangerous since the exploit appears to come from the third party web server, who the victim may trust and hence be more vulnerable to deception.
  • Cross-Site Scripting Using Alternate Syntax
    The attacker uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.

Nessus

  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2017-2905.NASL
    descriptionAn update for rh-sso7-keycloak is now available for Red Hat Single Sign-On 7.1 for RHEL 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Red Hat Single Sign-On is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This release of Red Hat Single Sign-On 7.1.3 serves as a replacement for Red Hat Single Sign-On 7.1.2, and includes several bug fixes and enhancements. For further information, refer to the Release Notes linked to in the References section. Security Fix(es) : * It was found that keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server. (CVE-2017-12158) * It was found that the cookie used for CSRF prevention in Keycloak was not unique to each session. An attacker could use this flaw to gain access to an authenticated user session, leading to possible information disclosure or further attacks. (CVE-2017-12159) * It was found that libpam4j did not properly validate user accounts when authenticating. A user with a valid password for a disabled account would be able to bypass security restrictions and possibly access sensitive information. (CVE-2017-12197) * It was found that Keycloak oauth would permit an authenticated resource to obtain an access/refresh token pair from the authentication server, permitting indefinite usage in the case of permission revocation. An attacker on an already compromised resource could use this flaw to grant himself continued permissions and possibly conduct further attacks. (CVE-2017-12160) Red Hat would like to thank Mykhailo Stadnyk (Playtech) for reporting CVE-2017-12158; Prapti Mittal for reporting CVE-2017-12159; and Bart Toersche (Simacan) for reporting CVE-2017-12160. The CVE-2017-12197 issue was discovered by Christian Heimes (Red Hat).
    last seen2020-06-01
    modified2020-06-02
    plugin id103957
    published2017-10-19
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103957
    titleRHEL 7 : rh-sso7-keycloak (RHSA-2017:2905)
    code
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Red Hat Security Advisory RHSA-2017:2905. The text 
    # itself is copyright (C) Red Hat, Inc.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(103957);
      script_version("3.11");
      script_cvs_date("Date: 2019/10/24 15:35:43");
    
      script_cve_id("CVE-2014-9970", "CVE-2017-12158", "CVE-2017-12159", "CVE-2017-12160", "CVE-2017-12197");
      script_xref(name:"RHSA", value:"2017:2905");
    
      script_name(english:"RHEL 7 : rh-sso7-keycloak (RHSA-2017:2905)");
      script_summary(english:"Checks the rpm output for the updated packages");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Red Hat host is missing one or more security updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "An update for rh-sso7-keycloak is now available for Red Hat Single
    Sign-On 7.1 for RHEL 7.
    
    Red Hat Product Security has rated this update as having a security
    impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
    score, which gives a detailed severity rating, is available for each
    vulnerability from the CVE link(s) in the References section.
    
    Red Hat Single Sign-On is a standalone server, based on the Keycloak
    project, that provides authentication and standards-based single
    sign-on capabilities for web and mobile applications.
    
    This release of Red Hat Single Sign-On 7.1.3 serves as a replacement
    for Red Hat Single Sign-On 7.1.2, and includes several bug fixes and
    enhancements. For further information, refer to the Release Notes
    linked to in the References section.
    
    Security Fix(es) :
    
    * It was found that keycloak would accept a HOST header URL in the
    admin console and use it to determine web resource locations. An
    attacker could use this flaw against an authenticated user to attain
    reflected XSS via a malicious server. (CVE-2017-12158)
    
    * It was found that the cookie used for CSRF prevention in Keycloak
    was not unique to each session. An attacker could use this flaw to
    gain access to an authenticated user session, leading to possible
    information disclosure or further attacks. (CVE-2017-12159)
    
    * It was found that libpam4j did not properly validate user accounts
    when authenticating. A user with a valid password for a disabled
    account would be able to bypass security restrictions and possibly
    access sensitive information. (CVE-2017-12197)
    
    * It was found that Keycloak oauth would permit an authenticated
    resource to obtain an access/refresh token pair from the
    authentication server, permitting indefinite usage in the case of
    permission revocation. An attacker on an already compromised resource
    could use this flaw to grant himself continued permissions and
    possibly conduct further attacks. (CVE-2017-12160)
    
    Red Hat would like to thank Mykhailo Stadnyk (Playtech) for reporting
    CVE-2017-12158; Prapti Mittal for reporting CVE-2017-12159; and Bart
    Toersche (Simacan) for reporting CVE-2017-12160. The CVE-2017-12197
    issue was discovered by Christian Heimes (Red Hat)."
      );
      # https://access.redhat.com/documentation/en-us/red_hat_single_sign-on/7.1/
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?1825fcce"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/errata/RHSA-2017:2905"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/security/cve/cve-2014-9970"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/security/cve/cve-2017-12158"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/security/cve/cve-2017-12159"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/security/cve/cve-2017-12160"
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://access.redhat.com/security/cve/cve-2017-12197"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Update the affected rh-sso7-keycloak and / or rh-sso7-keycloak-server
    packages."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
      script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/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:redhat:enterprise_linux:rh-sso7-keycloak");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-sso7-keycloak-server");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
    
      script_set_attribute(attribute:"vuln_publication_date", value:"2017/05/21");
      script_set_attribute(attribute:"patch_publication_date", value:"2017/10/17");
      script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/19");
      script_set_attribute(attribute:"generated_plugin", value:"current");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Red Hat Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("misc_func.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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
    os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
    os_ver = os_ver[1];
    if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "Red Hat " + 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$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
    
    yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
    if (!empty_or_null(yum_updateinfo)) 
    {
      rhsa = "RHSA-2017:2905";
      yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
      if (!empty_or_null(yum_report))
      {
        security_report_v4(
          port       : 0,
          severity   : SECURITY_WARNING,
          extra      : yum_report 
        );
        exit(0);
      }
      else
      {
        audit_message = "affected by Red Hat security advisory " + rhsa;
        audit(AUDIT_OS_NOT, audit_message);
      }
    }
    else
    {
      flag = 0;
      if (rpm_check(release:"RHEL7", reference:"rh-sso7-keycloak-2.5.14-1.Final_redhat_1.1.jbcs.el7")) flag++;
      if (rpm_check(release:"RHEL7", reference:"rh-sso7-keycloak-server-2.5.14-1.Final_redhat_1.1.jbcs.el7")) flag++;
    
      if (flag)
      {
        security_report_v4(
          port       : 0,
          severity   : SECURITY_WARNING,
          extra      : rpm_report_get() + redhat_report_package_caveat()
        );
        exit(0);
      }
      else
      {
        tested = pkg_tests_get();
        if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
        else audit(AUDIT_PACKAGE_NOT_INSTALLED, "rh-sso7-keycloak / rh-sso7-keycloak-server");
      }
    }
    
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2017-2904.NASL
    descriptionAn update for rh-sso7-keycloak is now available for Red Hat Single Sign-On 7.1 for RHEL 6. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Red Hat Single Sign-On is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This release of Red Hat Single Sign-On 7.1.3 serves as a replacement for Red Hat Single Sign-On 7.1.2, and includes several bug fixes and enhancements. For further information, refer to the Release Notes linked to in the References section. Security Fix(es) : * It was found that keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server. (CVE-2017-12158) * It was found that the cookie used for CSRF prevention in Keycloak was not unique to each session. An attacker could use this flaw to gain access to an authenticated user session, leading to possible information disclosure or further attacks. (CVE-2017-12159) * It was found that libpam4j did not properly validate user accounts when authenticating. A user with a valid password for a disabled account would be able to bypass security restrictions and possibly access sensitive information. (CVE-2017-12197) * It was found that Keycloak oauth would permit an authenticated resource to obtain an access/refresh token pair from the authentication server, permitting indefinite usage in the case of permission revocation. An attacker on an already compromised resource could use this flaw to grant himself continued permissions and possibly conduct further attacks. (CVE-2017-12160) Red Hat would like to thank Mykhailo Stadnyk (Playtech) for reporting CVE-2017-12158; Prapti Mittal for reporting CVE-2017-12159; and Bart Toersche (Simacan) for reporting CVE-2017-12160. The CVE-2017-12197 issue was discovered by Christian Heimes (Red Hat).
    last seen2020-06-01
    modified2020-06-02
    plugin id103956
    published2017-10-19
    reporterThis script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103956
    titleRHEL 6 : rh-sso7-keycloak (RHSA-2017:2904)

Redhat

advisories
  • rhsa
    idRHSA-2017:2904
  • rhsa
    idRHSA-2017:2905
  • rhsa
    idRHSA-2017:2906
rpms
  • rh-sso7-keycloak-0:2.5.14-1.Final_redhat_1.1.jbcs.el6
  • rh-sso7-keycloak-server-0:2.5.14-1.Final_redhat_1.1.jbcs.el6
  • rh-sso7-keycloak-0:2.5.14-1.Final_redhat_1.1.jbcs.el7
  • rh-sso7-keycloak-server-0:2.5.14-1.Final_redhat_1.1.jbcs.el7