jinja2: CVE-2024-34064: Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter

Debian Bug report logs - #1070712
jinja2: CVE-2024-34064: Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: jinja2: CVE-2024-34064: Jinja vulnerable to HTML attribute injection when passing user input as keys to xmlattr filter

Date: Tue, 07 May 2024 19:11:12 +0200

Source: jinja2
Version: 3.1.3-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for jinja2.

CVE-2024-34064[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2024-34064
    https://www.cve.org/CVERecord?id=CVE-2024-34064
[1] https://github.com/pallets/jinja/security/advisories/GHSA-h75v-3vvj-5mfj
[2] https://github.com/pallets/jinja/commit/d655030770081e2dfe46f90e27620472a502289d

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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