CVE-2024-27094 – @openzeppelin/contracts

Package

Manager: npm
Name: @openzeppelin/contracts
Vulnerable Version: >=4.5.0 <4.9.6 || >=5.0.0-rc.0 <5.0.2

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H/E:F/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00177 pctl0.39545

Details

OpenZeppelin Contracts base64 encoding may read from potentially dirty memory ### Impact The `Base64.encode` function encodes a `bytes` input by iterating over it in chunks of 3 bytes. When this input is not a multiple of 3, the last iteration may read parts of the memory that are beyond the input buffer. Although the `encode` function pads the output for these cases, up to 4 bits of data are kept between the encoding and padding, corrupting the output if these bits were dirty (i.e. memory after the input is not 0). These conditions are more frequent in the following scenarios: - A `bytes memory` struct is allocated just after the input and the first bytes of it are non-zero. - The memory pointer is set to a non-empty memory location before allocating the input. Developers should evaluate whether the extra bits can be maliciously manipulated by an attacker. ### Patches Upgrade to 5.0.2 or 4.9.6. ### References This issue was reported by the Independent Security Researcher Riley Holterhus through Immunefi (@rileyholterhus on X)

Metadata

Created: 2024-02-29T20:09:53Z
Modified: 2024-02-29T20:09:53Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/02/GHSA-9vx6-7xxf-x967/GHSA-9vx6-7xxf-x967.json
CWE IDs: ["CWE-125"]
Alternative ID: GHSA-9vx6-7xxf-x967
Finding: F111
Auto approve: 1