WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/init.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0.
Weakness
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Weasyprint | Ubuntu | questing | * |
| Weasyprint | Ubuntu | upstream | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/10.html
- https://cwe.mitre.org/data/definitions/101.html
- https://cwe.mitre.org/data/definitions/105.html
- https://cwe.mitre.org/data/definitions/108.html
- https://cwe.mitre.org/data/definitions/120.html
- https://cwe.mitre.org/data/definitions/13.html
- https://cwe.mitre.org/data/definitions/135.html
- https://cwe.mitre.org/data/definitions/14.html
- https://cwe.mitre.org/data/definitions/24.html
- https://cwe.mitre.org/data/definitions/250.html
- https://cwe.mitre.org/data/definitions/267.html
- https://cwe.mitre.org/data/definitions/273.html
- https://cwe.mitre.org/data/definitions/28.html
- https://cwe.mitre.org/data/definitions/3.html
- https://cwe.mitre.org/data/definitions/34.html
- https://cwe.mitre.org/data/definitions/42.html
- https://cwe.mitre.org/data/definitions/43.html
- https://cwe.mitre.org/data/definitions/45.html
- https://cwe.mitre.org/data/definitions/46.html
- https://cwe.mitre.org/data/definitions/47.html
- https://cwe.mitre.org/data/definitions/51.html
- https://cwe.mitre.org/data/definitions/52.html
- https://cwe.mitre.org/data/definitions/53.html
- https://cwe.mitre.org/data/definitions/6.html
- https://cwe.mitre.org/data/definitions/64.html
- https://cwe.mitre.org/data/definitions/67.html
- https://cwe.mitre.org/data/definitions/7.html
- https://cwe.mitre.org/data/definitions/71.html
- https://cwe.mitre.org/data/definitions/72.html
- https://cwe.mitre.org/data/definitions/76.html
- https://cwe.mitre.org/data/definitions/78.html
- https://cwe.mitre.org/data/definitions/79.html
- https://cwe.mitre.org/data/definitions/8.html
- https://cwe.mitre.org/data/definitions/80.html
- https://cwe.mitre.org/data/definitions/83.html
- https://cwe.mitre.org/data/definitions/84.html
- https://cwe.mitre.org/data/definitions/9.html
References
- https://github.com/Kozea/WeasyPrint/commit/e158264e33fa399b29f415d30719c1d85a55df1d
- https://github.com/Kozea/WeasyPrint/pull/2773
- https://github.com/Kozea/WeasyPrint/releases/tag/v69.0
- https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5
- https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5