: Successful exploitation yields full execution of arbitrary operating system commands. With a CVSS 3.1 score of 10.0 , an attacker completely bypasses local firewalls and access controls to gain total administrative command over the infrastructure target. 2. State-Machine Denial of Service (CVE-2020-3200)
The most critical vulnerabilities associated with Cisco SSH implementations (which often report this banner) include: Critical Vulnerabilities Authentication Bypass (CVE-2015-6280) : A flaw in the SSHv2 public key authentication
The SSH-2.0-Cisco-1.25 vulnerability is a security flaw that affects certain versions of Cisco's Secure Shell (SSH) implementation. SSH is a widely used protocol for secure remote access to network devices, and Cisco's implementation is used in many of their products. In this article, we'll delve into the details of the vulnerability, its impact, and provide guidance on how to mitigate it.
Flaws found in modern IOS and IOS XE distributions allow unauthorized users to repeatedly knock critical network infrastructure offline. ssh-2.0-cisco-1.25 vulnerability
For older Cisco environments, indicates that the device mandates the secure SSH version 2.0 protocol while operating on an older internal Cisco SSH code branch ( Cisco-1.25 ). Security scanning engines parse this plaintext banner during passive reconnaissance to match the asset against historically documented vulnerabilities. Associated Historical Vulnerabilities
One of the most well-documented issues involves an incompatibility with the popular PuTTY SSH client for Windows. The PuTTY client, as a security feature, pads password packets to a fixed length to mask the exact length of a user's password. This prevents an eavesdropper from gleaning information about the password's size. However, the SSH-2.0-Cisco-1.25 server in certain Cisco CatOS versions rejects these padded packets. It is unable to process them correctly, leading to failed authentication attempts. This forces administrators to disable a beneficial security feature (padding) just to achieve connectivity.
The most critical contemporary vulnerability associated with Cisco SSH services is the (CVE-2023-48795), which affects various Cisco platforms including Catalyst switches and XR routers. Key Vulnerabilities for Cisco SSH : Successful exploitation yields full execution of arbitrary
More severe is the discovery of remote command injection vulnerabilities. CVE-2024-20329, affecting Cisco ASA Software with the CiscoSSH stack enabled, allows an authenticated, remote attacker to execute operating system commands as root . This is due to insufficient validation of user input within the SSH subsystem. An attacker with valid but low-privileged credentials can leverage this flaw to gain complete control over the security appliance.
Over globally were recently detected online with this specific banner. Main Vulnerabilities Terrapin Attack (Downgrade) and Pre-Auth RCE . Mitigation
Consult Cisco Security Advisories for the latest recommended software releases that patch the SSH RSA-based authentication bypass vulnerability. Flaws found in modern IOS and IOS XE
The SSH-2.0-Cisco-1.25 vulnerability is a serious security issue that requires immediate attention. By understanding the vulnerability and taking steps to mitigate it, organizations can protect their Cisco devices and prevent potential security breaches.
A significant vulnerability exists in the SSHv2 implementation of Cisco IOS and IOS XE that allows an unauthenticated, remote attacker to bypass user authentication.
: Restrict SSH access to only trusted management networks using Access Control Lists (ACLs). An effective command example is: