Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1xMng3LThydjYtNnE3aM4ABCrP

Jinja has a sandbox breakout through indirect reference to format method

An oversight in how the Jinja sandboxed environment detects calls to str.format allows an attacker that controls the content of a template to execute arbitrary Python code.

To exploit the vulnerability, an attacker needs to control the content of a template. Whether that is the case depends on the type of application using Jinja. This vulnerability impacts users of applications which execute untrusted templates.

Jinja's sandbox does catch calls to str.format and ensures they don't escape the sandbox. However, it's possible to store a reference to a malicious string's format method, then pass that to a filter that calls it. No such filters are built-in to Jinja, but could be present through custom filters in an application. After the fix, such indirect calls are also handled by the sandbox.

Permalink: https://github.com/advisories/GHSA-q2x7-8rv6-6q7h
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1xMng3LThydjYtNnE3aM4ABCrP
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 16 days ago
Updated: 12 days ago

CVSS Score: 7.8
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Percentage: 0.00129
EPSS Percentile: 0.48201

Identifiers: GHSA-q2x7-8rv6-6q7h, CVE-2024-56326
References:

• https://github.com/pallets/jinja/security/advisories/GHSA-q2x7-8rv6-6q7h
• https://github.com/pallets/jinja/releases/tag/3.1.5
• https://nvd.nist.gov/vuln/detail/CVE-2024-56326
• https://github.com/pallets/jinja/commit/48b0687e05a5466a91cd5812d604fa37ad0943b4
• https://github.com/advisories/GHSA-q2x7-8rv6-6q7h

Repository: https://github.com/pallets/jinja
Blast Radius: 40.0

Affected Packages