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Security Advisories: GSA_kwCzR0hTQS05dng2LTd4eGYteDk2N84AA5qR
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 memorystruct 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)
Permalink: https://github.com/advisories/GHSA-9vx6-7xxf-x967JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS05dng2LTd4eGYteDk2N84AA5qR
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: 2 months ago
Updated: 2 months ago
Identifiers: GHSA-9vx6-7xxf-x967, CVE-2024-27094
References:
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9vx6-7xxf-x967
- https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/2d081f24cac1a867f6f73d512f2022e1fa987854
- https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/723f8cab09cdae1aca9ec9cc1cfa040c2d4b06c1
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/92224533b1263772b0774eec3134e132a3d7b2a6
- https://github.com/OpenZeppelin/openzeppelin-contracts/commit/a6286d0fded8771b3a645e5813e51993c490399c
- https://github.com/advisories/GHSA-9vx6-7xxf-x967
Blast Radius: 0.0
Affected Packages
npm:@openzeppelin/contracts-upgradeable
Dependent packages: 853Dependent repositories: 4,919
Downloads: 596,544 last month
Affected Version Ranges: >= 4.5.0, < 4.9.6, >= 5.0.0-rc.0, < 5.0.2
Fixed in: 4.9.6, 5.0.2
All affected versions: 4.5.0, 4.5.1, 4.5.2, 4.6.0, 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.8.0, 4.8.1, 4.8.2, 4.8.3, 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4, 4.9.5, 5.0.0, 5.0.0-rc.0, 5.0.0-rc.1, 5.0.0-rc.2, 5.0.1
All unaffected versions: 3.2.0, 3.3.0, 3.4.0, 3.4.1, 3.4.2, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.4.0, 4.4.1, 4.4.2, 4.9.6, 5.0.2
npm:@openzeppelin/contracts
Dependent packages: 3,207Dependent repositories: 34,743
Downloads: 1,542,151 last month
Affected Version Ranges: >= 5.0.0-rc.0, < 5.0.2, >= 4.5.0, < 4.9.6
Fixed in: 5.0.2, 4.9.6
All affected versions: 4.5.0, 4.6.0, 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.8.0, 4.8.1, 4.8.2, 4.8.3, 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4, 4.9.5, 5.0.0, 5.0.0-rc.0, 5.0.0-rc.1, 5.0.0-rc.2, 5.0.1
All unaffected versions: 2.3.0, 2.4.0, 2.5.0, 2.5.1, 3.0.0, 3.0.1, 3.0.2, 3.1.0, 3.2.0, 3.3.0, 3.4.0, 3.4.1, 3.4.2, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.4.0, 4.4.1, 4.4.2, 4.9.6, 5.0.2