| Name | CVE-2019-20920 |
| Description | Handlebars before 3.0.8 and 4.x before 4.5.3 is vulnerable to Arbitrary Code Execution. The lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript. This can be used to run arbitrary code on a server processing Handlebars templates or in a victim's browser (effectively serving as XSS). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libjs-handlebars (PTS) | jessie | 1.3.0-1 | vulnerable |
| stretch | 3:4.0.5-4 | vulnerable |
| node-handlebars (PTS) | buster | 3:4.1.0-1+deb10u3 | fixed |
| bullseye | 3:4.7.6+~4.1.0-2 | fixed |
| sid, trixie, bookworm | 3:4.7.7+~4.1.0-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[stretch] - libjs-handlebars <ignored> (Only reverse depends was diaspora which not in stretch and too intrusive to backport)
https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478
https://www.npmjs.com/advisories/1316
https://www.npmjs.com/advisories/1324
[jessie] - libjs-handlebars <ignored> (Minor issue and too intrusive to backport)