MitM attack in PuTTY



Published: 2020-07-02
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-14002
CWE-ID CWE-300
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		PuTTY
Client/Desktop applications / Software for system administration

Vendor Simon Tatham

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Man-in-the-Middle (MitM) attack

EUVDB-ID: #VU29487

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-14002

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a Man-in-the-Middle (MitM) attack.

The vulnerability exists due to an observable discrepancy issue in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PuTTY: 0.68 - 0.73

CPE2.3 External links

http://lists.tartarus.org/pipermail/putty-announce/
http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
http://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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