Reported

February 18, 2021

Issued

March 2, 2021 (last modified: June 13, 2023)

Package

scratchpad (crates.io)

Type

Vulnerability

Categories

• memory-corruption

Keywords

#memory-safety #double-free

Aliases

• CVE-2021-28031
• GHSA-3qm2-rfqw-fmrw

References

• https://github.com/okready/scratchpad/issues/1

CVSS Score

9.8 CRITICAL

CVSS Details

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS Vector

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

Patched

• >=1.3.1

Affected Functions

Version

scratchpad::SliceMoveSource::move_elements

• <1.3.1

Description

Affected versions of scratchpad used ptr::read to read elements while calling a user provided function f on them.

Since the pointer read duplicates ownership, a panic inside the user provided f function could cause a double free when unwinding.

The flaw was fixed in commit 891561bea by removing the unsafe block and using a plain iterator.

Advisory available under CC0-1.0 license.