CVE-2021-36367
First published: Fri Jul 09 2021(Updated: )
PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/putty | <=0.63-10+deb8u1<=0.75-2<=0.63-10 | 0.75-3 0.74-1+deb11u1 |
| debian/putty | <=0.70-6<=0.74-1 | 0.74-1+deb11u1 0.78-2 0.78-2+deb12u1 0.80-1 |
| PuTTY | <=0.75 |
Remedy
https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa
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Reference Links
- https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
- https://security-tracker.debian.org/tracker/CVE-2021-36367
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36367
- https://git.tartarus.org/?p=simon/putty.git;a=commit;h=413398af85b27cd83134f5618bd82f81758f9603
- https://salsa.debian.org/ssh-team/putty/-/commit/038d22ebea69fad4bf26e32a7c5e82845ba9b29d
- https://bugs.debian.org/990901
- https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/reject-trivial-auth.html
- https://security-tracker.debian.org/tracker/CVE-2023-48795
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990901
- https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa
- https://www.debian.org/security/2023/dsa-5588
- https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-36367.
What is the severity of CVE-2021-36367?
The severity of CVE-2021-36367 is high (8.1).
What software is affected by CVE-2021-36367?
PuTTY version 0.75 is affected by CVE-2021-36367.
How does CVE-2021-36367 affect PuTTY?
CVE-2021-36367 allows for an attacker-controlled SSH server to present a spoofed authentication prompt and capture credential data.
Are there any references available for CVE-2021-36367?
Yes, you can find more information about CVE-2021-36367 in the references section.
- collector/debian-bugs
- alias/CVE-2021-36367
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/author
- agent/remedy
- agent/weakness
- agent/severity
- agent/event
- agent/references
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- collector/nvd-index
- package-manager/debian
- vendor/putty
- canonical/putty
- version/putty/0.75