Protection Mechanism Failure Affecting py3-jinja2 package, versions <3.1.5-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.13% (49th percentile)

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  • Snyk IDSNYK-ALPINE318-PY3JINJA2-8549220
  • published24 Dec 2024
  • disclosed23 Dec 2024

Introduced: 23 Dec 2024

NewCVE-2024-56326  (opens in a new tab)
CWE-693  (opens in a new tab)
CWE-1336  (opens in a new tab)

How to fix?

Upgrade Alpine:3.18 py3-jinja2 to version 3.1.5-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream py3-jinja2 package and not the py3-jinja2 package as distributed by Alpine. See How to fix? for Alpine:3.18 relevant fixed versions and status.

Jinja is an extensible templating engine. Prior to 3.1.5, 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. This vulnerability is fixed in 3.1.5.

CVSS Scores

version 3.1