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ID

VDE-2024-014

Published

2024-02-22 08:00 (CET)

Last update

2024-02-19 09:08 (CET)

Vendor(s)

WAGO GmbH & Co. KG

Product(s)

Article No┬░ Product Name Affected Version(s)
750-810x < FW 22, Patch 2
750-811x < FW 27
750-820x < FW 22, Patch 2
750-820x < 03.03.08 (80)
750-821x < FW 27
750-821x < 04.03.03 (70)
750-821x < FW 22, Patch 2
751-9301 < FW 27
751-9301 < 04.03.03 (72)
751-9401 < FW 27
751-9401 < 04.03.03 (72)
752-8303 < FW 27
752-8303 < FW 22, Patch 2
762-4x0x < FW 27
762-4x0x < FW 22, Patch 2
762-5x0x < FW 22, Patch 2
762-5x0x < FW 27
762-6x0x < FW 27
762-6x0x < FW 22, Patch 2

Last Update:

Feb. 2, 2024, 11:24 a.m.

Weakness

Improper Validation of Integrity Check Value  (CWE-354) 

Summary

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in chacha20-poly1305@openssh.com and (if CBC is used) the -etm@openssh.com MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.10.6, libssh2 through 1.11.0, Thorn Tech SFTP Gateway before 3.4.6, Tera Term before 5.1, Paramiko before 3.4.0, jsch before 0.2.15, SFTPGo before 2.5.6, Netgate pfSense Plus through 23.09.1, Netgate pfSense CE through 2.7.2, HPN-SSH through 18.2.0, ProFTPD before 1.3.8b (and before 1.3.9rc2), ORYX CycloneSSH before 2.3.4, NetSarang XShell 7 before Build 0144, CrushFTP before 10.6.0, ConnectBot SSH library before 2.2.22, Apache MINA sshd through 2.11.0, sshj through 0.37.0, TinySSH through 20230101, trilead-ssh2 6401, LANCOM LCOS and LANconfig, FileZilla before 3.66.4, Nova before 11.8, PKIX-SSH before 14.4, SecureCRT before 9.4.3, Transmit5 before 5.10.4, Win32-OpenSSH before 9.5.0.0p1-Beta, WinSCP before 6.2.2, Bitvise SSH Server before 9.32, Bitvise SSH Client before 9.33, KiTTY through 0.76.1.13, the net-ssh gem 7.2.0 for Ruby, the mscdex ssh2 module before 1.15.0 for Node.js, the thrussh library before 0.35.1 for Rust, and the Russh crate before 0.40.2 for Rust.


Impact

The Terrapin attack vulnerability in the SSH transport protocol poses a risk by allowing remote attackers to compromise the integrity of connections, potentially leading to the downgrade or disablement of critical security features.

Solution

Remediation

A fix for the affected Firmwares will be provided with the following firmware versions:

  • >= FW 22, Patch 2 installed on 750-810x
  • >= FW 22, Patch 2 installed on 750-821x
  • >= FW 22, Patch 2 installed on 762-4x0x
  • >= FW 22, Patch 2 installed on 762-5x0x
  • >= FW 22, Patch 2 installed on 762-6x0x
  • >= FW 22, Patch 2 installed on 752-8303
  • >= FW 27 installed on 750-811x
  • >= FW 27 installed on 750-821x
  • >= FW 27 installed on 751-9301
  • >= FW 27 installed on 751-9401
  • >= FW 27 installed on 762-4x0x
  • >= FW 27 installed on 762-5x0x
  • >= FW 27 installed on 762-6x0x
  • >= FW 27 installed on 752-8303
  • >= Custom Firmware 03.03.08 (80) installed on 750-820x
  • >= Custom Firmware 04.03.03 (72) installed on 751-9301
  • >= Custom Firmware 04.03.03 (72) installed on 751-9401
  • >= Custom Firmware 04.04.03 (70) installed on 750-821x

Reported by

CERT@VDE coordinated with WAGO GmbH & Co. KG