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SIGIL GENERATOR PAGEANT SOLOVEEV SOFTWARE
SIGIL GENERATOR PAGEANT SOLOVEEV CODE

Should only appear if you're using Plink for terminal-based Which was the original use case for Plink in any case.

Should cover all cases where Plink is being used as a transport for an In particular, the rule about redirecting Plink's standard input Unconditionally eliminates the new prompt.

Plink with the -no-antispoof option, which

If you trust your server not to do this in any case, you can run.

Wouldn't be able to enter a response even if you were fooledīy the prompt. Spoofing would not gain the server anything in any case, since you Other than the terminal, then server-side authentication-prompt

If you run Plink with its standard input redirected to anywhere.

Interactive authentication prompts, so you'll already be suspicious ofĪnything that resembles one.

If you run Plink with the -batch option, it isĪssumed that you already know that you're not expecting any.

This additional interactive prompt is rather annoying (especially if you had set up one-touch authentication via a passphraseless SSH key or Pageant), so we provide as many methods as possible to avoid it: It already and will know to be suspicious. Overwrites the message immediately afterwards, the user will have seen Then we wait for the user toĪcknowledge it by pressing Return, which means that even if the server Session begins, we print a new interactive message: ‘Access granted. In Plink: at the point where authentication ends and the main Is saying whatever is written next to it.) (You can think of itĪs the name of the speaker in a chat: it's indicating that PuTTY Icon, because it's multicoloured and distinctive. We've chosen a small copy of the PuTTY program's Must be something the server can't cause PuTTY to display by sendingĮscape sequences.

SIGIL GENERATOR PAGEANT SOLOVEEV CODE

Marked with what our code describes as a ‘trust sigil’. Legitimately emitted by the local PuTTY during SSH connection setup is In GUI PuTTY: any line of the terminal containing data that was The screen and didn't catch the (probable) rapid flicker, you mightĮasily miss that completely, and then the separator line would haveĪs of 0.71, we're using the following combination of strategies toĭistinguish legitimate from fake authentication prompts. Server could immediately send escape sequences that moved the cursorīack up by a line and erased the separator! If you looked away from For example, it wouldn't beĮnough for PuTTY to display a separator line between the realĪuthentication prompts and the start of the main session, because the It's alsoĭifficult to fix because the Unix terminal model gives the server so

SIGIL GENERATOR PAGEANT SOLOVEEV SOFTWARE

Software vulnerability, so it requires a user-interface fix. This is a user-interface weakness rather than the usual kind of (which, for example, you might have considered safe to copy aroundīecause it was securely encrypted), then this would give it

If the server had also acquired a copy of your encrypted key file

Passphrase, which should not have been sent to any remote server. If you didn't know for sure that you didn'tĮxpect that prompt, the server might trick you into entering your Text that looked exactly like PuTTY prompting you for your private key The server after PuTTY's authentication phase had already completed.įor example, suppose that a malicious server let you log in withoutĪny authentication at all, and then started the session by sending SSH private key passphrase), or whether it was a faked version sent by User-authentication prompt (such as a prompt for a password, or for an Indicate whether a piece of terminal output was a genuine Up to and including version 0.70, the PuTTY tools had no way to Wishlist summary: Authentication prompts can be spoofed by a malicious serverĬlass: vulnerability: This is a security vulnerability. PuTTY vulnerability vuln-auth-prompt-spoofing PuTTY vulnerability vuln-auth-prompt-spoofing