Bug 2086690 (CVE-2021-36368) - CVE-2021-36368 openssh: possible bypass of fido 2 devices and ssh-askpass
Summary: CVE-2021-36368 openssh: possible bypass of fido 2 devices and ssh-askpass
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-36368
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 2086696
TreeView+ depends on / blocked
 
Reported: 2022-05-16 13:18 UTC by TEJ RATHI
Modified: 2022-05-27 15:43 UTC (History)
10 users (show)

Fixed In Version:
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Last Closed: 2022-05-16 13:19:11 UTC


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Description TEJ RATHI 2022-05-16 13:18:57 UTC
** DISPUTED ** An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed."

https://github.com/openssh/openssh-portable/pull/258
https://docs.ssh-mitm.at/trivialauth.html
https://bugzilla.mindrot.org/show_bug.cgi?id=3316
https://www.openssh.com/security.html
https://security-tracker.debian.org/tracker/CVE-2021-36368


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