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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTQ2Mnctdjk3ci00bTQ1

Jinja2 sandbox escape via string formatting

In Pallets Jinja before 2.10.1, str.format_map allows a sandbox escape.

The sandbox is used to restrict what code can be evaluated when rendering untrusted, user-provided templates. Due to the way string formatting works in Python, the str.format_map method could be used to escape the sandbox.

This issue was previously addressed for the str.format method in Jinja 2.8.1, which discusses the issue in detail. However, the less-common str.format_map method was overlooked. This release applies the same sandboxing to both methods.

If you cannot upgrade Jinja, you can override the is_safe_attribute method on the sandbox and explicitly disallow the format_map method on string objects.

Permalink: https://github.com/advisories/GHSA-462w-v97r-4m45
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTQ2Mnctdjk3ci00bTQ1
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 5 years ago
Updated: 2 months ago


CVSS Score: 8.6
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS Percentage: 0.0029
EPSS Percentile: 0.69514

Identifiers: GHSA-462w-v97r-4m45, CVE-2019-10906
References: Blast Radius: 44.1

Affected Packages

pypi:Jinja2
Dependent packages: 4,068
Dependent repositories: 133,056
Downloads: 229,886,080 last month
Affected Version Ranges: < 2.10.1
Fixed in: 2.10.1
All affected versions: 2.1.1, 2.2.1, 2.3.1, 2.4.1, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.7.1, 2.7.2, 2.7.3, 2.8.1, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6
All unaffected versions: 2.10.1, 2.10.2, 2.10.3, 2.11.0, 2.11.1, 2.11.2, 2.11.3, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4