CyberArk Password Vault Web Access .NET Object Deserialization (Direct Check)

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

include("compat.inc");

if (description)
{
  script_id(110287);
  script_version("1.5");
  script_cvs_date("Date: 2019/10/07 15:15:27");

  script_cve_id("CVE-2018-9843");
  script_bugtraq_id(105180);

  script_name(english:"CyberArk Password Vault Web Access .NET Object Deserialization (Direct Check)");
  script_summary(english:"Sends a .NET object to trigger an error message.");

  script_set_attribute(attribute:"synopsis", value:
"An Identity Management application running on the remote host is affected by
a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The CyberArk Password Vault Web Access running on the remote host is
affected by a remote code execution vulnerability due to unsafe
deserialization of an .NET object. An unauthenticated, remote
attacker can exploit this, via a crafted a .NET object, to execute
arbitrary .NET code in the context of the IIS server.");

  # https://www.redteam-pentesting.de/en/advisories/rt-sa-2017-014/-cyberark-password-vault-web-access-remote-code-execution
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e1d84c64");
  script_set_attribute(attribute:"solution", value:
"Upgrade to CyberArk Password Vault Web Access 9.9.5, 9.10.1, 10.2 or Later.");
  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:POC/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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-9843");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/02/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/06/01");

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

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cyberark_password_vault_detection.nbin");
  script_require_keys("installed_sw/CyberArk Password Vault Web Access");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("install_func.inc");

app   = 'CyberArk Password Vault Web Access';

# Plugin will exit if app is not detected on host
get_install_count(app_name:app, exit_if_zero:TRUE);

# Plugin will exit if app is not detected on this port
port = get_http_port(default:80);
install = get_single_install(app_name:app, port:port, exit_if_unknown_ver:FALSE);

url = "/PasswordVault/WebServices/PIMServices.svc/Applications/?Location=\&IncludeSublocations=true";

cmd = 'ping -n 3 localhost';

# vuln verification 
#cmd = 'dir > c:\\Windows\\Temp\\hacked.txt';

cmd = '/c ' + cmd;

obj = raw_string(
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0x00) +
mkword(strlen(cmd)) + cmd +
raw_string(
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); 

# PVWA can be slow to respond
http_set_read_timeout(30);

token = base64(str: obj);
res = http_send_recv3(
        port        : port, 
        method      : 'GET',
        item        : url,
        add_headers : make_array('authorization', token),
        content_type: 'application/json',
        fetch404    : TRUE,
        exit_on_fail: TRUE
      );

if(isnull(res[2]))
  audit(AUDIT_RESP_NOT, port, 'a GET request: No data in the response body');

# 
# Patched:
# 403 
# {"ErrorCode":"CAWS00001E","ErrorMessage":"Connection to the Vault was terminated."}
if (res[2] !~ "Unable to cast object of type.* to type 'CyberArk.Services.Web.SessionIdentifiers")
{
  audit(AUDIT_INST_VER_NOT_VULN, app, install['version']);
}

#
# Vulenrable:
# 403
# {"ErrorCode":"CAWS00001E","ErrorMessage":"Error raised while trying to establish session using session token provided. Error: Unable to cast object of type 'System.Collections.Generic.SortedSet`1[System.String]' to type 'CyberArk.Services.Web.SessionIdentifiers'."}
#
report =
  '\nNessus was able to detect the .NET deserialization vulnerability by' +
  '\nsending a crafted .NET object.' +
  '\n';
security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);