CVE-2024-34064: jinja XSS — Fix

Description

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.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
palletsprojects	jinja	< 3.1.4
fedoraproject	fedora	All
fedoraproject	fedora	All

References

Advisories & Patches

https://github.com/pallets/jinja/commit/0668239dc6b44ef38e7a6c9f91f312fd4ca581cb https://github.com/pallets/jinja/security/advisories/GHSA-h75v-3vvj-5mfj https://github.com/pallets/jinja/commit/0668239dc6b44ef38e7a6c9f91f312fd4ca581cb https://github.com/pallets/jinja/security/advisories/GHSA-h75v-3vvj-5mfj

Other References

https://lists.fedoraproject.org/archives/list/[email protected]/message/567XIGSZMABG6TSMYWD7MIYNJSUQQRUC/ https://lists.fedoraproject.org/archives/list/[email protected]/message/GCLF44KY43BSVMTE6S53B4V5WP3FRRSE/ https://lists.fedoraproject.org/archives/list/[email protected]/message/SSCBHIL6BYKR5NRCBXP4XMP2CEEKGFVS/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZALNWE3TXPPHVPSI3AZ5CTMSTAVN5UMS/ https://lists.debian.org/debian-lts-announce/2024/12/msg00009.html https://lists.fedoraproject.org/archives/list/[email protected]/message/567XIGSZMABG6TSMYWD7MIYNJSUQQRUC/ https://lists.fedoraproject.org/archives/list/[email protected]/message/GCLF44KY43BSVMTE6S53B4V5WP3FRRSE/ https://lists.fedoraproject.org/archives/list/[email protected]/message/SSCBHIL6BYKR5NRCBXP4XMP2CEEKGFVS/ https://lists.fedoraproject.org/archives/list/[email protected]/message/ZALNWE3TXPPHVPSI3AZ5CTMSTAVN5UMS/

Frequently Asked Questions

What is CVE-2024-34064? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2024-34064? +

CVE-2024-34064 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-34064? +

CVE-2024-34064 affects products from fedoraproject, palletsprojects, specifically: fedora, jinja. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-34064? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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