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RUSTSEC-2021-0014

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

Issued
Package
marc (crates.io)
Type
Vulnerability
Categories
Aliases
Details
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) }).