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OpenSSH 9.0 released

Submitted by Rianne Schestowitz on Friday 8th of April 2022 05:38:41 PM Filed under
Security

OpenSSH 9.0 has been released. It is claimed to be primarily a bug-fix release, but it also switches to a new, quantum-computer-proof key-exchange protocol by default and includes a number of sftp changes, some of which may create some compatibility issues (described in the announcement) with scp.

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OpenSSH 9.0 Release Notes

Submitted by Roy Schestowitz on Tuesday 12th of April 2022 01:07:02 PM.
  • OpenSSH 9.0 Release Notes

    This release switches scp(1) from using the legacy scp/rcp protocol to using the SFTP protocol by default.

    Legacy scp/rcp performs wildcard expansion of remote filenames (e.g. "scp host:* .") through the remote shell. This has the side effect of requiring double quoting of shell meta-characters in file names included on scp(1) command-lines, otherwise they could be interpreted as shell commands on the remote side.

    This creates one area of potential incompatibility: scp(1) when using the SFTP protocol no longer requires this finicky and brittle quoting, and attempts to use it may cause transfers to fail. We consider the removal of the need for double-quoting shell characters in file names to be a benefit and do not intend to introduce bug-compatibility for legacy scp/rcp in scp(1) when using the SFTP protocol.

    Another area of potential incompatibility relates to the use of remote paths relative to other user's home directories, for example - "scp host:~user/file /tmp". The SFTP protocol has no native way to expand a ~user path. However, sftp-server(8) in OpenSSH 8.7 and later support a protocol extension "expand-path@openssh.com" to support this.

    In case of incompatibility, the scp(1) client may be instructed to use the legacy scp/rcp using the -O flag.

"OpenBSD 7.1 will include the new release."

Submitted by Roy Schestowitz on Tuesday 12th of April 2022 01:07:17 PM.

Further coverage

Submitted by Roy Schestowitz on Thursday 14th of April 2022 05:12:56 AM.
  • OpenSSH Moves to Prevent 'Capture Now, Decrypt Later' Attacks

    Security experts warn that advanced threat actors are already stealing and storing encrypted data for a future when quantum computers are capable of cracking all known encryption algorithms and the latest moves by OpenSSH is meant to proactively address these risks.

    According to notes published alongside the release of OpenSSH 9.0, the open-source group will now use the hybrid Streamlined NTRU Prime + x25519 key exchange method by default, a move that includes a backstop against future discoveries of flaws in the NTRU algorithm.

OpenSSH takes aim at 'capture now, decrypt later' quantum attack

Submitted by Roy Schestowitz on Saturday 16th of April 2022 02:58:15 PM.
  • OpenSSH takes aim at 'capture now, decrypt later' quantum attacks

    OpenSSH 9 is here, with updates aimed at dealing with cryptographically challenging quantum computers.

    The popular open-source SSH implementation aims to provide secure communication in a potentially unsecure network environments. While version 9 is ostensibly focused on bug-fixing, there are some substantial changes lurking within that could catch the unwary, most notably, the switch from the legacy SCP/RCP protocol to SFTP by default.

    The OpenSSH group warned the change was coming earlier this year, with a deprecation notice in February's version 8.9 release. Experimental support for transfers using the SFTP protocol as a replacement for the SCP/RCP protocol turned up in version 8.7 in August 2021 with the warning: "It is intended for SFTP to become the default transfer mode in the near future."

    The future, it appears, has arrived (at least as far as OpenSSH is concerned) with the defaulting to SFTP, which introduces some potential incompatibilities: gone is the requirement for the "finicky and brittle quoting" used by the legacy SCP/RCP "and attempts to use it may cause transfers to fail," according to the OpenSSH group, which added there was no intention to introduce bug-compatibility for legacy SCP/RCP when using the SFTP protocol (although the -O flag can be used to force scp to use the legacy protocol.)

New OpenSSH version uses stronger key-exchange mechanism

Submitted by Roy Schestowitz on Saturday 16th of April 2022 03:34:40 PM.

  • iTWire - New OpenSSH version uses stronger key-exchange mechanism by default

    A new version of OpenSSH, an implementation of the secure shell protocol, includes a switch to a new key-exchange mechanism by default, among other changes.

    An advisory from developer Damien Miller said the new release, OpenSSH 9.0, switched scp, the secure copy tool which is part of the app, from using the legacy scp/rcp protocol to using the SFTP protocol by default.

    OpenSSH is run by the OpenBSD project which is headed by Theo de Raadt. SSH or secure shell is a program used to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another.

    It provides strong authentication and secure communications over insecure channels. OpenSSH is a free implementation of the program.

OpenSSH 9.0 bakes in post-quantum cryptography...

Submitted by Roy Schestowitz on Saturday 23rd of April 2022 07:37:13 AM.
  • OpenSSH 9.0 bakes in post-quantum cryptography to future proof against attacks

    The latest OpenSSH 9.0 release defaults to the NTRU Prime algorithm – a scheme designed to resist brute-force attacks that might be enabled by future quantum computers – while supporting the previous default (X25519 ECDH key exchange) as a backstop. In either case, the algorithms are used to negotiate session keys that protect data in transit.

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