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CVE-2023-38408: Disallow remote addition of FIDO/PKCS11 provider libraries to · openbsd/src@7bc29a9

The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if an agent is forwarded to an attacker-controlled system. (Code in /usr/lib is not necessarily safe for loading into ssh-agent.) NOTE: this issue exists because of an incomplete fix for CVE-2016-10009.

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Disallow remote addition of FIDO/PKCS11 provider libraries to

ssh-agent by default.

The old behaviour of allowing remote clients from loading providers can be restored using `ssh-agent -O allow-remote-pkcs11`.

Detection of local/remote clients requires a ssh(1) that supports the `[email protected]` extension. Forwarding access to a ssh-agent socket using non-OpenSSH tools may circumvent this control.

ok markus@

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