Various other products utilizing the underlying SSH implementation.
Get for checking your ISE software version?
Ensure that your Cisco devices only negotiate modern, secure ciphers and key exchange algorithms. Enter global configuration mode and explicitly define acceptable parameters:
If you meant a different vulnerability involving , such as the CVE-2024-20329 root-access flaw, or the September 2022 SSH DoS , I can provide those details instead. ssh20cisco125 vulnerability
no ip ssh version 1
! Force the device to only accept SSH Version 2 ip ssh version 2 ! Block weak, legacy encryption ciphers ip ssh cipher aes256-gcm aes128-gcm ! Enforce strong Key Exchange and HMAC algorithms ip ssh dh min size 4096 ip ssh hmac sha2-256 sha2-512 ! Lower time-outs and connection retry thresholds to deter scanners ip ssh time-out 30 ip ssh authentication-retries 3 Use code with caution. Step 2: Implement VTY Access Control Lists
This vulnerability affects Cisco devices running if the Web UI feature is enabled. Block weak, legacy encryption ciphers ip ssh cipher
The affected devices would identify their SSH protocol version as 2.0 when only SSHv2 was enabled, or 1.99 when both v1 and v2 were supported. These specific version strings are important because the exploit conditions depended on the protocol version and authentication method in use.
The keyword ssh20cisco125 refers to a combination of and a specific Cisco internal bug identifier (CSCso125) . This identifier is associated with a well-documented set of vulnerabilities in early Cisco IOS releases that supported the Secure Shell (SSH) protocol version 2. These issues were publicly disclosed by Cisco in April 2005 and have been tracked under official security advisories and CVE (Common Vulnerabilities and Exposures) identifiers, primarily CVE-2005-1020 and CVE-2005-1021 .
Always backup your configuration before upgrading. primarily CVE-2005-1020 and CVE-2005-1021 .
Because the attacker utilizes valid SSH parameters, standard network monitoring tools may register the malicious configuration changes as legitimate administrative tasks. Detection and Remediation Strategies
. When a client initiates a connection to a Secure Shell (SSH) server, the server responds with a version string to negotiate the connection. SSH-2.0-Cisco-1.25 breaks down as:
: Ensure that access to the SSH server is restricted to trusted management networks using Access Control Lists (ACLs) to limit the attack surface. Context: Other Notable Cisco SSH Vulnerabilities