Spoofing attack in PuTTY



Published: 2021-07-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-36367
CWE-ID CWE-345
Exploitation vector Network
Public exploit N/A
Vulnerable software
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PuTTY
Client/Desktop applications / Software for system administration

Vendor Simon Tatham

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Insufficient verification of data authenticity

EUVDB-ID: #VU55005

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36367

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient verification of data source when processing authentication responses. A remote attacker can send a spoofed authentication prompt even after an SSH session has been established with the original server and trick the victim into providing authentication credentials.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PuTTY: 0.45 - beta 0.67

External links

http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
http://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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