RUSTSEC-2021-0014

Record::read : Custom Read on uninitialized buffer may cause UB

Reported

January 26, 2021

Issued

January 27, 2021 (last modified: June 13, 2023)

Package

marc (crates.io)

Type

Vulnerability

Categories

memory-exposure

Aliases

References

https://github.com/blackbeam/rust-marc/issues/7

CVSS Score

7.5 HIGH

CVSS Details

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

CVSS Vector

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

Patched

>=2.0.0

Description

Affected versions of this crate passes an uninitialized buffer to a user-provided Read implementation. (Record::read())

Arbitrary Read implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer. Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.

This flaw was fixed in commit 6299af0 by zero-initializing the newly allocated memory (via data.resize(len, 0)) instead of exposing uninitialized memory (unsafe { data.set_len(len) }).

Advisory available under CC0-1.0 license.