Jinja2 < 3.1.6 Sandbox Bypass (CVE-2025-27516)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(326272);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/13");

  script_cve_id("CVE-2025-27516");

  script_name(english:"Jinja2 < 3.1.6 Sandbox Bypass (CVE-2025-27516)");

  script_set_attribute(attribute:"synopsis", value:
"A Python library installed on the remote host is affected by a sandbox bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Jinja2 installed on the remote host is prior to 3.1.6. It is, therefore,
affected by a sandbox bypass vulnerability:

  - 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. 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. (CVE-2025-27516)

Note that Nessus has not tested for this issue but has instead relied only on the application's
self-reported version number.");
  # https://github.com/pallets/jinja/security/advisories/GHSA-cpwx-vrp4-4pq7
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3dd1deb9");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Jinja2 version 3.1.6 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"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");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-27516");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/03/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/03/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:palletsprojects:jinja2");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("python_packages_installed_nix.nbin", "python_packages_win_installed.nbin");
  script_require_ports("Host/nix/Python/Packages/Enumerated", "Host/win/Python/Packages/Enumerated");

  exit(0);
}

include('python.inc');

var pkg = 'jinja2';
var cpe = 'cpe:/a:palletsprojects:jinja2';

var libs = python::get_package_info(pkg_name:pkg, cpe:cpe);

if (empty_or_null(libs))
  audit(AUDIT_NOT_INST, pkg);

vcf::check_all_backporting(app_info:libs);

var constraints = [
  {'fixed_version': '3.1.6'}
];

vcf::check_version_and_report(app_info:libs, constraints:constraints, severity:SECURITY_WARNING);