PuTTY 0.73

PuTTY is a free implementation of SSH and Telnet for Windows and Unix platforms, along with an xterm terminal emulator.

Tags win32 putty ssh telnet terminal-client file-transfer ftp tftp
License MITL
State beta

Recent Releases

0.7330 Sep 2019 16:25 minor feature: Security : on Windows, other applications were able to bind to the same TCP port as a PuTTY local port forwarding. Security : in bracketed paste mode, the terminal escape sequences that should delimit the pasted data were appearing together on one side of it, making it possible to misidentify pasted data as manual keyboard input. possibly security-related): an SSH-1 server sending a disconnection message could cause an access to freed memory. Windows Plink would crash on startup if it was acting as a connection-sharing downstream. Windows PuTTY now updates its terminal window size correctly if the screen resolution changes while it's maximised. tweaked terminal handling to prevent lost characters at the ends of lines in gcc's coloured error messages. removed a bad interaction between the 'clear scrollback' operation and mouse selection that could give rise to the dreaded "line==NULL" assertion box.
0.7221 Jul 2019 12:25 minor feature: Security found by the EU-funded bounty: two separate vulnerabilities affecting the obsolete SSH-1 protocol, both available before host key checking a vulnerability in all the SSH client tools (PuTTY, Plink, PSFTP and PSCP) if a malicious program can impersonate Pageant. crash in GSSAPI / Kerberos key exchange affecting third-party GSSAPI providers on Windows (such as MIT Kerberos for Windows). crash in GSSAPI / Kerberos key exchange triggered if the server provided an ordinary SSH host key as part of the exchange. trust sigils were never turned off in SSH-1 or Rlogin. trust sigils were never turned back on if you used Restart Session. PSCP in SCP download mode could create files with a spurious newline at the end of their names. PSCP in SCP download mode with the. -p option would generate spurious complaints about illegal file renaming. the initial instruction message was never printed during SSH. keyboard-interactive authentication. pasting very long lines through connection sharing could crash the downstream PuTTY window. in keyboard layouts with a ',' key on the numeric keypad (e.g. German), Windows PuTTY would generate '.' instead for that key. PuTTYgen could generate RSA keys with a modulus one bit shorter than requested.
0.7117 Mar 2019 11:05 minor feature: Security found by an EU-funded bounty programme: a remotely triggerable memory overwrite in RSA key exchange, which can occur before host key verification potential recycling of random numbers used in cryptography. on Windows, hijacking by a malicious help file in the same directory as the executable. on Unix, remotely triggerable buffer overflow in any kind of server-to-client forwarding. multiple denial-of-service attacks that can be triggered by writing to the terminal. Other security enhancements: major rewrite of the crypto code to remove cache and timing side channels. We now provide pre-built binaries for Windows on Arm. Hardware-accelerated versions of the most common cryptographic primitives: AES, SHA-256, SHA-1. GTK PuTTY now supports non-X11 displays (e.g. Wayland) and high-DPI configurations. Type-ahead now works as soon as a PuTTY window is opened: keystrokes typed before authentication has finished will be buffered instead of being dropped. Support for GSSAPI key exchange: an alternative to the older GSSAPI authentication system which can keep your forwarded Kerberos credentials updated during a long session. More choices of user interface for clipboard handling. New terminal features: support the REP escape sequence, true colour, and SGR 2 dim text. Pressing Ctrl+Shift+PgUp or Ctrl+Shift+PgDn now takes you straight to the top or bottom of the terminal scrollback.
0.7011 Jul 2017 01:25 minor feature: Security : the Windows PuTTY binaries should no longer be Vulnerable to hijacking by specially named DLLs in the same directory, Even a name we missed when we thought we'd this in 0.69. See vuln-indirect-dll-hijack-3. Windows PuTTY should be able to print again, after our DLL. Hijacking defences broke that functionality. Windows PuTTY should be able to accept keyboard input outside the. Current code page, after our DLL hijacking defences broke that too.
0.6726 Mar 2016 21:15 minor feature: Security fix: a buffer overrun in the old-style SCP protocol when receiving the header of each file downloaded from the server is fixed. See vuln-pscp-sink-sscanf. Windows PuTTY now sets its process ACL more restrictively, in an attempt to defend against malicious other processes reading sensitive data out of its memory. Assorted other robustness fixes for crashes and memory leaks. We have started using Authenticode to sign our Windows executables and installer.