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PuTTY bug pageant-aborted-decrypt-crash

PuTTY bug pageant-aborted-decrypt-crash

summary: Pageant crashes if signature request aborted before deferred decryption passphrase is entered
class: bug: This is clearly an actual problem we want fixed.
absent-in: 0.74
present-in: 0.82
fixed-in: ec158a2e19c9f81b3676e157652d93955789f423 5b2fa80c5758fd52b034dd5daac45604285447b3 (0.83)

In Pageant's deferred decryption feature, you can load a key into Pageant still encrypted, and when a PuTTY tool first tries to use it, Pageant will prompt for the passphrase by displaying a dialog box (on Windows, or various alternatives on Unix).

If you do this, then close the PuTTY tool, and then finish entering the passphrase into the dialog box, then Pageant dereferences a stale pointer and crashes.

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Audit trail for this bug.

(last revision of this bug record was at 2025-01-18 13:17:38 +0000)