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Possible attachment of arbitrary files and URLs to a PDF

High
liZe published GHSA-35jj-wx47-4w8r Mar 8, 2024

Package

pip weasyprint (pip)

Affected versions

61.0 and 61.1

Patched versions

61.2

Description

Impact

Since version 61.0, there's a vulnerability which allows attaching content of arbitrary files and URLs to a generated PDF document, even if url_fetcher is configured to prevent access to files and URLs.

Patches

Fixed by 734ee8e that’s included in 61.2

Workarounds

  • Check that no PDF attachment is defined in source HTML.
  • Launch WeasyPrint in a sandbox that prevents access to the filesystem and the network.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

CVE ID

CVE-2024-28184

Weaknesses

No CWEs

Credits