Medium: python-jinja2

Issue Overview:

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. (CVE-2024-34064)

Affected Packages:

python-jinja2

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update python-jinja2 to update your system.

New Packages:

noarch:  
    python-jinja2-2.7.2-3.amzn2.0.2.noarch  
  
src:  
    python-jinja2-2.7.2-3.amzn2.0.2.src  

Additional References

Red Hat: CVE-2024-34064

Mitre: CVE-2024-34064