RUSTSEC-2020-0029

Allows viewing and modifying arbitrary structs as bytes

Issued

June 14, 2020

Package

rgb (crates.io)

Type

INFO Unsound

Keywords

#type-confusion

Aliases

CVE-2020-25016

Details

https://github.com/kornelski/rust-rgb/issues/35

CVSS Score

9.1 CRITICAL

CVSS Details

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Patched

>=0.8.20

Unaffected

<0.5.4

Keywords

#type-confusion

Description

Affected versions of rgb crate allow viewing and modifying data of any type T wrapped in RGB<T> as bytes, and do not correctly constrain RGB<T> and other wrapper structures to the types for which it is safe to do so.

Safety violation possible for a type wrapped in RGB<T> and similar wrapper structures:

If T contains padding, viewing it as bytes may lead to exposure of contents of uninitialized memory.
If T contains a pointer, modifying it as bytes may lead to dereferencing of arbitrary pointers.
Any safety and/or validity invariants for T may be violated.

The issue was resolved by requiring all types wrapped in structures provided by RGB crate to implement an unsafe marker trait.