Windows clients also block these packets, but generate an ICMP response when such a packet is blocked. Packets using this option are generally blocked by routers and security devices, making it essentially impossible to send such packets over the public internet. Source routing is one of the mostly forgotten IP options, though it does see some use in niche applications. The vulnerable network stacks are in devices like IP cameras, printers, and other invisible software.ĬVE-2021-24074 is a potential RCE resulting from improper handling of source routing packets. The problem with embedded systems is that they often never get security updates. Most of the vulnerable implementations use a system time value as their ISN, while several use a predictable pseudorandom algorithm that can be easily reversed. Of the eleven embedded stacks texted, nine have serious weaknesses in their ISN generation. Once the security ramifications of this approach were understood, the major implementations moved to a random number generation for their ISNs. It was originally possible because TCP implementations used a simple counter to set the ISN. The attack has been around for years, originally known as the Mitnick Attack. Knowing the current sequence number, as well as a couple other pieces of information, a third party can close a TCP stream or even inject data. If a collision can cause problems when it happens by chance, what can a hacker do with it intentionally Potentially quite a bit.

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