RUSTSEC-2020-0165

mozjpeg DecompressScanlines::read_scanlines is Unsound

Reported

July 4, 2020

Issued

August 30, 2022

Package

mozjpeg (crates.io)

Type

INFO Unsound

Categories

memory-corruption

Keywords

#type-confusion

Details

https://github.com/ImageOptim/mozjpeg-rust/issues/10

Patched

>=0.8.19

Affected Functions

Version

mozjpeg::DecompressScanlines::read_scanlines

<0.8.19

Description

This issue and vector is similar to RUSTSEC-2020-0029 of rgb crate which mozjpeg depends on.

Affected versions of mozjpeg crate allow creating instances of any type T from bytes, and do not correctly constrain T to the types for which it is safe to do so.

Examples of safety violation possible for a type T:

T contains a reference type, and it constructs a pointer to an invalid, arbitrary memory address.
T requires a safety and/or validity invariant for its construction that may be violated.

The issue was fixed in 0.8.19 by using safer types and involving rgb dependency bump.