CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
AI Score
Confidence
Low
EPSS
Percentile
99.3%
This host is accepting
# SPDX-FileCopyrightText: 2015 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.805142");
script_version("2024-09-27T05:05:23+0000");
script_cve_id("CVE-2015-0204");
script_tag(name:"cvss_base", value:"4.3");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
script_tag(name:"last_modification", value:"2024-09-27 05:05:23 +0000 (Fri, 27 Sep 2024)");
script_tag(name:"creation_date", value:"2015-03-06 16:42:13 +0530 (Fri, 06 Mar 2015)");
script_name("SSL/TLS: RSA Temporary Key Handling 'RSA_EXPORT' Downgrade Issue (FREAK)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2015 Greenbone AG");
script_family("SSL and TLS");
script_dependencies("gb_ssl_tls_ciphers_gathering.nasl");
script_mandatory_keys("ssl_tls/ciphers/supported_ciphers", "ssl_tls/port");
script_xref(name:"URL", value:"https://freakattack.com");
script_xref(name:"URL", value:"http://www.securityfocus.com/bid/71936");
script_xref(name:"URL", value:"http://secpod.org/blog/?p=3818");
script_xref(name:"URL", value:"http://blog.cryptographyengineering.com/2015/03/attack-of-week-freak-or-factoring-nsa.html");
script_tag(name:"summary", value:"This host is accepting 'RSA_EXPORT' cipher suites
and is prone to man in the middle attack.");
script_tag(name:"vuldetect", value:"Check previous collected cipher suites saved in the KB.");
script_tag(name:"insight", value:"Flaw is due to improper handling RSA
temporary keys in a non-export RSA key exchange cipher suite.");
script_tag(name:"impact", value:"Successful exploitation will allow remote
attacker to downgrade the security of a session to use 'RSA_EXPORT' cipher suites,
which are significantly weaker than non-export cipher suites. This may allow a
man-in-the-middle attacker to more easily break the encryption and monitor
or tamper with the encrypted stream.");
script_tag(name:"affected", value:"- Hosts accepting 'RSA_EXPORT' cipher suites
- OpenSSL version before 0.9.8zd, 1.0.0 before 1.0.0p, and 1.0.1 before 1.0.1k.");
script_tag(name:"solution", value:"- Remove support for 'RSA_EXPORT' cipher
suites from the service.
- If running OpenSSL update to version 0.9.8zd or 1.0.0p
or 1.0.1k or later.");
script_tag(name:"qod_type", value:"remote_banner");
script_tag(name:"solution_type", value:"VendorFix");
exit(0);
}
include("ssl_funcs.inc");
include("host_details.inc");
cipherText = "'RSA_EXPORT' cipher suites";
if( ! port = tls_ssl_get_port() )
exit( 0 );
if( ! sup_ssl = get_kb_item( "tls/supported/" + port ) )
exit( 0 );
if( "SSLv3" >< sup_ssl ) {
sslv3CipherList = get_kb_list( "secpod_ssl_ciphers/sslv3/" + port + "/supported_ciphers" );
if( ! isnull( sslv3CipherList ) ) {
# Sort to not report changes on delta reports if just the order is different
sslv3CipherList = sort( sslv3CipherList );
foreach sslv3Cipher( sslv3CipherList ) {
if( "_RSA_EXPORT_" >< sslv3Cipher ) {
sslv3Vuln = TRUE;
sslv3tmpReport += sslv3Cipher + '\n';
}
}
if( sslv3Vuln ) {
report += cipherText + ' accepted by this service via the SSLv3 protocol:\n\n' + sslv3tmpReport + '\n';
}
}
}
if( "TLSv1.0" >< sup_ssl ) {
tlsv1_0CipherList = get_kb_list( "secpod_ssl_ciphers/tlsv1/" + port + "/supported_ciphers" );
if( ! isnull( tlsv1_0CipherList ) ) {
# Sort to not report changes on delta reports if just the order is different
tlsv1_0CipherList = sort( tlsv1_0CipherList );
foreach tlsv1_0Cipher( tlsv1_0CipherList ) {
if( "_RSA_EXPORT_" >< tlsv1_0Cipher ) {
tlsv1_0Vuln = TRUE;
tlsv1_0tmpReport += tlsv1_0Cipher + '\n';
}
}
if( tlsv1_0Vuln ) {
report += cipherText + ' accepted by this service via the TLSv1.0 protocol:\n\n' + tlsv1_0tmpReport + '\n';
}
}
}
if( "TLSv1.1" >< sup_ssl ) {
tlsv1_1CipherList = get_kb_list( "secpod_ssl_ciphers/tlsv1_1/" + port + "/supported_ciphers" );
if( ! isnull( tlsv1_1CipherList ) ) {
# Sort to not report changes on delta reports if just the order is different
tlsv1_1CipherList = sort( tlsv1_1CipherList );
foreach tlsv1_1Cipher( tlsv1_1CipherList ) {
if( "_RSA_EXPORT_" >< tlsv1_1Cipher ) {
tlsv1_1Vuln = TRUE;
tlsv1_1tmpReport += tlsv1_1Cipher + '\n';
}
}
if( tlsv1_1Vuln ) {
report += cipherText + ' accepted by this service via the TLSv1.1 protocol:\n\n' + tlsv1_1tmpReport + '\n';
}
}
}
if( "TLSv1.2" >< sup_ssl ) {
tlsv1_2CipherList = get_kb_list( "secpod_ssl_ciphers/tlsv1_2/" + port + "/supported_ciphers" );
if( ! isnull( tlsv1_2CipherList ) ) {
# Sort to not report changes on delta reports if just the order is different
tlsv1_2CipherList = sort( tlsv1_2CipherList );
foreach tlsv1_2Cipher( tlsv1_2CipherList ) {
if( "_RSA_EXPORT_" >< tlsv1_2Cipher ) {
tlsv1_2Vuln = TRUE;
tlsv1_2tmpReport += tlsv1_2Cipher + '\n';
}
}
if( tlsv1_2Vuln ) {
report += cipherText + ' accepted by this service via the TLSv1.2 protocol:\n\n' + tlsv1_2tmpReport + '\n';
}
}
}
if( report ) {
# nb:
# - Store the reference from this one to gb_ssl_tls_ciphers_report.nasl to show a cross-reference within the
# reports
# - We don't want to use get_app_* functions as we're only interested in the cross-reference here
register_host_detail( name:"detected_by", value:"1.3.6.1.4.1.25623.1.0.802067" ); # gb_ssl_tls_ciphers_report.nasl
register_host_detail( name:"detected_at", value:port + "/tcp" );
security_message( port:port, data:report );
exit( 0 );
}
exit( 99 );