https://bugzilla.redhat.com/show_bug.cgi?id=2135229
Bug ID: 2135229
Summary: CVE-2021-36369 <net-misc/dropbear-2022.82: forwarded
agent abuse
Product: Security Response
Hardware: All
OS: Linux
Status: NEW
Component: vulnerability
Keywords: Security
Severity: high
Priority: high
Assignee: security-response-team(a)redhat.com
Reporter: mrehak(a)redhat.com
CC: buytenh(a)wantstofly.org, cickumqt(a)gmail.com,
daniellarasouza(a)yahoo.com.br,
epel-packagers-sig(a)lists.fedoraproject.org
Target Milestone: ---
Classification: Other
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
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https://bugzilla.redhat.com/show_bug.cgi?id=2135229