Bug 921734

Summary:	<dev-python/jinja-3.1.3: HTML attribute injection when passing user input as keys to xmlattr filter
Product:	Gentoo Security	Reporter:	Michał Górny <mgorny>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	CONFIRMED ---
Severity:	normal	CC:	ajak, python
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:	B3 [glsa?]
Package list:		Runtime testing required:	---
Bug Depends on:	921733
Bug Blocks:

Description Michał Górny archtester

2024-01-11 04:12:17 UTC

The xmlattr filter in affected versions of Jinja accepts keys containing spaces. XML/HTML attributes cannot contain spaces, as each would then be interpreted as 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. Note that accepting keys as user input is not common or a particularly intended use case of the xmlattr filter, and an application doing so should already be verifying what keys are provided regardless of this fix.

Comment 1 Michał Górny archtester

2024-01-11 11:46:31 UTC

cleanup done.