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CVE-2024-34064

Published: 6 May 2024

Jinja is an extensible templating engine. The `xmlattr` filter in affected versions of Jinja accepts keys containing non-attribute characters. XML/HTML attributes cannot contain spaces, `/`, `>`, or `=`, as each would then be interpreted as starting a separate attribute. If an application accepts keys (as opposed to only values) as user input, and renders these in pages that other users see as well, an attacker could use this to inject other attributes and perform XSS. The fix for CVE-2024-22195 only addressed spaces but not other characters. Accepting keys as user input is now explicitly considered an unintended use case of the `xmlattr` filter, and code that does so without otherwise validating the input should be flagged as insecure, regardless of Jinja version. Accepting _values_ as user input continues to be safe. This vulnerability is fixed in 3.1.4.

Priority

Medium

Status

Package Release Status
jinja2
Launchpad, Ubuntu, Debian
bionic
Released (2.10-1ubuntu0.18.04.1+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (2.10.1-2ubuntu0.3)
jammy
Released (3.0.3-1ubuntu0.2)
mantic
Released (3.1.2-1ubuntu0.23.10.2)
noble
Released (3.1.2-1ubuntu1.1)
trusty
Released (2.7.2-2ubuntu0.1~esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (3.1.4)
xenial
Released (2.8-1ubuntu0.1+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)