Bug 2135229 (CVE-2021-36369) - CVE-2021-36369 <net-misc/dropbear-2022.82: forwarded agent abuse
Summary: CVE-2021-36369 <net-misc/dropbear-2022.82: forwarded agent abuse
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-36369
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2135230 2135231
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-10-17 06:15 UTC by Marian Rehak
Modified: 2022-11-29 20:27 UTC (History)
4 users (show)

Fixed In Version:
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Environment:
Last Closed: 2022-11-29 20:27:59 UTC
Embargoed:

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Description Marian Rehak 2022-10-17 06:15:06 UTC 
Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed.

Reference:

https://github.com/mkj/dropbear/pull/128
https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82
https://github.com/mkj/dropbear/releases
Comment 1 Marian Rehak 2022-10-17 06:15:24 UTC 
Created dropbear tracking bugs for this issue:

Affects: epel-all [bug 2135231]
Affects: fedora-all [bug 2135230]
Comment 2 Product Security DevOps Team 2022-11-29 20:27:57 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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