SSH Insertion Attack: Exploiting CBC and CFB Modes Vulnerability

CVE-1999-1085 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

SSH 1.2.25, 1.2.23, and other versions, when used in in CBC (Cipher Block Chaining) or CFB (Cipher Feedback 64 bits) modes, allows remote attackers to insert arbitrary data into an existing stream between an SSH client and server by using a known plaintext attack and computing a valid CRC-32 checksum for the packet, aka the "SSH insertion attack."

Learn more about our Cis Benchmark Audit For Server Software.