PuTTY Information for VU#888801

SSL/TLS implementations disclose side channel information via PKCS #1 v1.5 version number extension


Not Affected

Vendor Statement

PuTTY cannot be vulnerable to any attack of this type in the SSH1 transport layer, since it is an SSH client only and the RSA decryption is done in the server. An SSH agent could feasibly be vulnerable if it reported SSH_AGENT_FAILURE in response to PKCS encoding errors, but PuTTY's agent implementation (Pageant) will never do this, so it is believed safe.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References



The CERT/CC has no additional comments at this time.

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