RUSTSEC-2020-0081

mio invalidly assumes the memory layout of std::net::SocketAddr

Reported

November 2, 2020

Issued

December 2, 2020 (last modified: June 13, 2023)

Package

mio (crates.io)

Type

INFO Unsound

Keywords

#memory #layout #cast

Aliases

References

https://github.com/tokio-rs/mio/issues/1386

CVSS Score

5.5 MEDIUM

CVSS Details

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

CVSS Vector

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

Patched

>=0.7.6

Unaffected

<0.7.0

Description

The mio crate has assumed std::net::SocketAddrV4 and std::net::SocketAddrV6 have the same memory layout as the system C representation sockaddr. It has simply casted the pointers to convert the socket addresses to the system representation. The standard library does not say anything about the memory layout, and this will cause invalid memory access if the standard library changes the implementation. No warnings or errors will be emitted once the change happens.

Advisory available under CC0-1.0 license.