Prototype pollution in msgpack5 - CVE-2021-21368
Published: June 2, 2023
Vulnerability identifier: #VU76823
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-21368
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: mcollina
Affected software:
msgpack5
msgpack5
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript code.
The vulnerability occrures when msgpack5 decodes a map containing a key "__proto__", it assigns the decoded value to __proto__. Object.prototype.__proto__ is an accessor property for the receiver's prototype. A remote user can pass specially crafted input to the application and perform prototype pollution, which can result in information disclosure or data manipulation.
How to mitigate CVE-2021-21368
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..
Sources
- https://github.com/mcollina/msgpack5/releases/tag/v3.6.1
- https://github.com/mcollina/msgpack5/releases/tag/v5.2.1
- https://github.com/mcollina/msgpack5/releases/tag/v4.5.1
- https://github.com/mcollina/msgpack5/commit/d4e6cb956ae51c8bb2828e71c7c1107c340cf1e8
- https://github.com/mcollina/msgpack5/security/advisories/GHSA-gmjw-49p4-pcfm
- https://www.npmjs.com/package/msgpack5