PT-2020-19673 · None · Class-Transformer

Published 2020-04-06 · Updated 2022-12-02 · CVE-2020-7637

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions class-transformer versions prior to 0.3.1

Description The issue allows attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a proto payload.

Recommendations For versions prior to 0.3.1, update to version 0.3.1 or later to resolve the issue. As a temporary workaround, consider restricting the use of the classToPlainFromExist function until a patch is available.

Exploit

Fix

Prototype Pollution

Weakness Enumeration

CWE-1321

CWE-915

Related Identifiers

CVE-2020-7637

GHSA-6GP3-H3JJ-PRX4

SNYK-JS-CLASSTRANSFORMER-564431

Affected Products

Class-Transformer

References · 8

• 🔥 https://snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431 · Exploit
• https://github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2020-7637 · Security Note
• https://osv.dev/vulnerability/CVE-2020-7637 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-6gp3-h3jj-prx4 · Vendor Advisory
• https://github.com/typestack/class-transformer/blob/a650d9f490573443f62508bc063b857bcd5e2525/src/ClassTransformer.ts#L29-L31, · Note
• https://github.com/typestack/class-transformer · Note
• https://t.me/cvenotify/2429 · Telegram Post