Deep dives, practical guides, and incident analyses from engineers who build Safeguard. No fluff, no vendor FUD — just what you need to ship secure software.
Input that should follow a format but is never checked against it can crash a parser or slip past a filter. An IP address check bypass shows how.
An array index or file offset taken from input must be checked before use. A large or negative value reads or writes places the code never meant to expose.
Sizes, lengths, prices and counts from users drive allocations, loops and math. If you never check them, a negative balance or a huge buffer is one request away.
Secure boot measurements prove a device booted untampered code, but only if the registers holding them cannot be changed by an attacker.
Boot code, public keys and device IDs are trusted because they never change. Store them in writable memory and that trust has no basis.
A particular mix of legal and illegal instructions can lock a CPU until hard reset, letting an unprivileged program deny service to the whole machine.
A check that finishes after the read or write has already happened protects nothing. In hardware, the check and the access must be atomic.
A wrap-around error turns a large value into a tiny or negative one. See how it triggers overflows and infinite loops, and how to guard arithmetic in C.
A crypto unit that starts before its RNG or key fuse is up produces a result that looks fine and is not. Ordering is a security property.
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