advisory-db/crates/memoffset/RUSTSEC-2023-0045.md

[advisory]
id = "RUSTSEC-2023-0045"
package = "memoffset"
date = "2023-06-21"
url = "https://github.com/Gilnaa/memoffset/issues/24"
informational = "unsound"
categories = ["memory-corruption"]
keywords = ["memoffset", "offset"]
aliases = ["GHSA-wfg4-322g-9vqv"]
[affected]
functions = { "memoffset::offset_of" = ["< 0.6.2"] }
[versions]
patched = [">= 0.6.2"]

memoffset allows reading uninitialized memory

memoffset allows attempt of reading data from address 0 with arbitrary type. This behavior is an undefined behavior because address 0 to std::mem::size_of<T> may not have valid bit-pattern with T. Old implementation dereferences uninitialized memory obtained from std::mem::align_of. Older implementation prior to it allows using uninitialized data obtained from std::mem::uninitialized with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that does not allow to be uninitialized.

This flaw was corrected by using std::ptr::addr_of in https://github.com/Gilnaa/memoffset/pull/50.