A critical vulnerability exists in legacy Cisco IOS software versions that implement the SSH Version 1.5 (SSHv1) protocol. Exploitation of the parsing error (commonly triggered by sending a malformed packet containing the string 1.25 or exploiting the CRC32 integrity check) causes the vulnerable device to crash due to an unexpected buffer overflow or infinite loop. This report outlines the technical mechanism, affected products, and remediation strategies.
The exploit, known as CVE-2006-2371, was a remote code execution vulnerability that could be triggered by an unauthenticated attacker. The exploit involved sending a specially crafted SSH packet to the vulnerable device, which would then execute arbitrary code. The code would be executed in the context of the SSH server, which typically runs with elevated privileges. cisco ssh 1.25 exploit
Note: Modern IOS (12.3 and later), IOS-XE, and NX-OS are affected. A critical vulnerability exists in legacy Cisco IOS