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Vulnerability · Published Mar 3, 2021 · Assigned by GitHub_M

CVE-2021-21353Remote code execution in pug

Medium 6.8

In plain English

A medium-severity injection in pug from pugjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.3% (higher than 91% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)4.3%top 8.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

Pug is an npm package which is a high-performance template engine. In pug before version 3.0.1, if a remote attacker was able to control the `pretty` option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend. This is fixed in version 3.0.1. This advisory applies to multiple pug packages including "pug", "pug-code-gen". pug-code-gen has a backported fix at version 2.0.3. This advisory is not exploitable if there is no way for un-trusted input to be passed to pug as the `pretty` option, e.g. if you compile templates in advance before applying user input to them, you do not need to upgrade.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmpug3.0.1GHSA-p493-635q-r6gr
npmpug-code-gen2.0.3GHSA-p493-635q-r6gr
npmpug-code-gen3.0.2GHSA-p493-635q-r6gr

Affected products (as reported)

VendorProductVersions
pugjs pug < 3.0.1

Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

References