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FreeBSD : Jinja2 -- Sandbox breakout through attr filter selecting format method (3299cbfd-fa6e-11ef-929d-b0416f0c4c67)

medium Nessus Plugin ID 232324

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 3299cbfd-fa6e-11ef-929d-b0416f0c4c67 advisory.

 [email protected] reports:
 Jinja is an extensible templating engine. Prior to 3.1.6, an oversight in how the Jinja sandboxed environment interacts with the |attr filter 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 use the |attr filter to get a reference to a string's plain format method, bypassing the sandbox.
 After the fix, the |attr filter no longer bypasses the environment's attribute lookup. This vulnerability is fixed in 3.1.6.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://nvd.nist.gov/vuln/detail/CVE-2025-27516

http://www.nessus.org/u?406532b1

Plugin Details

Severity: Medium

ID: 232324

File Name: freebsd_pkg_3299cbfdfa6e11ef929db0416f0c4c67.nasl

Version: 1.1

Type: local

Published: 3/10/2025

Updated: 3/10/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2025-27516

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.4

Threat Score: 2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:py310-jinja2, p-cpe:/a:freebsd:freebsd:py311-jinja2, p-cpe:/a:freebsd:freebsd:py38-jinja2, p-cpe:/a:freebsd:freebsd:py39-jinja2

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 3/6/2025

Vulnerability Publication Date: 3/5/2025

Reference Information

CVE: CVE-2025-27516