| code | #
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(62777);
script_version("1.6");
script_cvs_date("Date: 2018/11/15 20:50:26");
script_cve_id("CVE-2011-2592", "CVE-2011-2593");
script_bugtraq_id(54754);
script_xref(name:"Secunia", value:"45299");
script_xref(name:"IAVB", value:"2012-B-0077");
script_name(english:"Citrix Access Gateway Plug-in for Windows ActiveX Control StartEPA() Method HTTP Response Header Parsing Overflows (CTX134303)");
script_summary(english:"Checks control's version / kill bit");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Windows host has an ActiveX control that is affected by
multiple buffer overflow vulnerabilities."
);
script_set_attribute(
attribute:"description",
value:
"The Citrix Access Gateway ActiveX control for Citrix Access Gateway
Enterprise Edition is installed on the remote Windows host. It is the
ActiveX component of the Citrix Access Gateway Plug-in for Windows and
provides an SSL-based VPN via a web browser.
The installed version of this control (nsepa.exe) is affected by the
following vulnerabilities involving the 'StartEPA()' method that could
lead to arbitrary code execution :
- A boundary error exists that can be exploited to cause
a heap-based buffer overflow when processing overly
long 'CSEC' HTTP response headers. (CVE-2011-2592)
- An integer overflow exists that can be exploited to
cause a heap-based buffer overflow when processing
specially crafted 'Content-Length' HTTP response
headers. (CVE-2011-2593)"
);
script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/523728/30/0/threaded");
script_set_attribute(attribute:"see_also", value:"https://www.securityfocus.com/archive/1/523729/30/0/threaded");
script_set_attribute(attribute:"see_also", value:"https://support.citrix.com/article/CTX134303");
script_set_attribute(
attribute:"solution",
value:
"Update to version 9.3-57.5 / 10.0-69.4 or set the kill bit for the
control."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:"vuln_publication_date", value:"2012/08/01");
script_set_attribute(attribute:"patch_publication_date", value:"2012/08/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2012/10/31");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:citrix:access_gateway");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows");
script_copyright(english:"This script is Copyright (C) 2012-2018 Tenable Network Security, Inc.");
script_dependencies("smb_hotfixes.nasl");
script_require_keys("SMB/Registry/Enumerated");
script_require_ports(139, 445);
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("smb_func.inc");
include("smb_activex_func.inc");
get_kb_item_or_exit("SMB/Registry/Enumerated");
if (activex_init() != ACX_OK) audit(code:1, AUDIT_FN_FAIL, 'activex_init');
# Test each control
info = "";
clsids = make_list(
# 9.x
'{391DFC1F-B9B9-4A3D-A352-9A541A3630A6}',
# 10.x
'{69B69991-62EC-4b51-9E72-8FC664BEC7DB}'
);
not_vuln_ver_installed = FALSE;
foreach clsid (clsids)
{
file = activex_get_filename(clsid:clsid);
if (isnull(file))
{
activex_end();
audit(AUDIT_FN_FAIL, 'activex_get_filename', 'NULL');
}
if (!file) continue;
# Get its version.
version = activex_get_fileversion(clsid:clsid);
if (!version)
{
activex_end();
audit(AUDIT_VER_FAIL, file);
}
ver_pat = "^([0-9]+\.[0-9]+)\.([0-9]+\.[0-9]+)$";
version_ui = ereg_replace(pattern:ver_pat, replace:"\1-\2", string:version);
ver = split(version,sep:'.', keep:FALSE);
for (x=0; x<max_index(ver); x++)
ver[x] = int(ver[x]);
# And check it.
# Affected versions :
# 10.x < 10.0-69.4
# 9.x < 9.3-57.5
if (
(
clsid == '{69B69991-62EC-4b51-9E72-8FC664BEC7DB}' &&
ver[0] == 10 && ver[1] == 0 &&
(
ver[2] < 69 ||
(
ver[2] == 69 && ver[3] < 4
)
)
) ||
(
clsid == '{391DFC1F-B9B9-4A3D-A352-9A541A3630A6}' &&
ver[0] == 9 &&
(
ver[1] < 5 ||
(
ver[1] == 5 &&
(
ver[2] < 57 ||
(
ver[2] == 57 && ver[3] < 5
)
)
)
)
)
)
{
vuln_version = TRUE;
if (report_paranoia > 1 || activex_get_killbit(clsid:clsid) == 0)
{
info = '\n Class identifier : ' + clsid +
'\n Filename : ' + file +
'\n Installed version : ' + version_ui +
'\n Fixed version : 9.3-57.5 / 10.0-69.4\n';
}
}
else
{
not_vuln_ver_installed = TRUE;
not_vuln_version = version_ui;
not_vuln_path = file;
}
}
activex_end();
# Report findings.
if (info)
{
if (report_paranoia > 1)
{
report = info +
'\n' +
'Note, though, that Nessus did not check whether the kill bit was\n' +
"set for the control's CLSID because of the Report Paranoia setting" + '\n' +
'in effect when this scan was run.\n';
}
else
{
report = info +
'\n' +
'Moreover, its kill bit is not set so it is accessible via Internet\n' +
'Explorer.\n';
}
if (report_verbosity > 0) security_hole(port:kb_smb_transport(), extra:report);
else security_hole(kb_smb_transport());
exit(0);
}
else
{
if (vuln_version == TRUE) audit(AUDIT_ACTIVEX, version_ui);
else
{
if (not_vuln_ver_installed) audit(AUDIT_INST_PATH_NOT_VULN, "'nsepa.exe'", not_vuln_version, not_vuln_path);
else audit(AUDIT_NOT_INST, "'nsepacom' control");
}
}
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