Copssh version 5.4.1 bundle contains 32/64-bit client/server installers with updated OpenSSL and Cygwin/GNU tools. OpenSSL 1.0.2e fixes 5 security vulnerabilities:

• Moderate - BN_mod_exp may produce incorrect results on x86_64 (CVE-2015-3193)
• Moderate - Certificate verify crash with missing PSS parameter (CVE-2015-3194)
• Moderate - X509_ATTRIBUTE memory leak (CVE-2015-3195)
• Low - Race condition handling PSK identify hint (CVE-2015-3196)
• Low - Anon DH ServerKeyExchange with 0 p parameter (CVE-2015-1794)

We have also updated Cygwin/GNU Tools to the latest stable versions. Enjoy!

Version 5.4.4 of cwRsync installers come with newer versions of Cygwin, OpenSSH and OpenSSL. See version page for more details.

Copssh version 5.3.0 bundle contains 32/64-bit client/server installers with OpenSSH 7.0. Focus of this release is primarily to deprecate weak, legacy and/or unsafe cryptography:

• Support for the legacy SSH version 1 protocol is disabled by default at compile time.
• Support for the 1024-bit diffie-hellman-group1-sha1 key exchange is disabled by default at run-time. It may be re-enabled using the instructions at http://www.openssh.com/legacy.html
• Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html
• Support for the legacy v00 cert format has been removed.

 Security related fixes:

• sshd(8): OpenSSH 6.8 and 6.9 incorrectly set TTYs to be world-writable. Local attackers may be able to write arbitrary messages to logged-in users, including terminal escape sequences. Reported by Nikolay Edigaryev.
• sshd(8): Portable OpenSSH only: Fixed a privilege separation weakness related to PAM support. Attackers who could successfully compromise the pre-authentication process for remote code execution and who had valid credentials on the host could impersonate other users. Reported by Moritz Jodeit.
• sshd(8): Portable OpenSSH only: Fixed a use-after-free bug related to PAM support that was reachable by attackers who could compromise the pre-authentication process for remote code execution. Also reported by Moritz Jodeit.
• sshd(8): fix circumvention of MaxAuthTries using keyboard-interactive authentication. By specifying a long, repeating keyboard-interactive "devices" string, an attacker could request the same authentication method be tried thousands of times in a single pass. The LoginGraceTime timeout in sshd(8) and any authentication failure delays implemented by the authentication mechanism itself were still applied. Found by Kingcope.

Copssh version 5.1.1 is a maintenance release and contains the latest available versions of Cygwin (2.0.2) and related GNU tools.

Copssh version 5.0.4 comes with a custom patch addressing session hang problems during logout for domain users. Users experiencing the problem reported that they observe following lines in the event log:

error: chmod /dev/pty1 0666 failed: No such file or directory

error: chown /dev/pty1 0 0 failed: No such file or directory

As a result of that failure, you may observe multiple hanging sshd processes at the server side as well. Please upgrade if you experience those problems in your environment.

Contents of the custom patch:

--- sshpty.c 2014-05-21 09:06:47.000000000 +0200+++ sshpty.new.c 2015-03-06 17:26:49.125000000 +0100@@ -85,12 +85,7 @@ void pty_release(const char *tty) {-#ifndef __APPLE_PRIVPTY__- if (chown(tty, (uid_t) 0, (gid_t) 0) < 0)- error("chown %.100s 0 0 failed: %.100s", tty, strerror(errno));- if (chmod(tty, (mode_t) 0666) < 0)- error("chmod %.100s 0666 failed: %.100s", tty, strerror(errno));-#endif /* __APPLE_PRIVPTY__ */+ return; }  /* Makes the tty the process's controlling tty and sets it to sane modes. */