Smarty_Security::isTrustedResourceDir() in Smarty before 3.1.33 is prone to a path traversal vulnerability due to insufficient template code

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• debian debian linux9.0
• smarty smartybefore 3.1.33

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2021-26120Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.
  64This week
• CVE-2009-1669The smarty_function_math function in libs/plugins/function.math.php in Smarty 2.6.22 allows context-dependent attackers to execute arbitrary
  44Plan
• CVE-2010-4727Smarty before 3.0.0 beta 7 does not properly handle the <?php and ?> tags, which has unspecified impact and remote attack vectors.
  41Plan
• CVE-2010-4726Unspecified vulnerability in the math plugin in Smarty before 3.0.0 RC1 has unknown impact and remote attack vectors.
  41Plan
• CVE-2010-4725Smarty before 3.0.0 RC3 does not properly handle an on value of the asp_tags option in the php.ini file, which has unspecified impact and re
  41Plan
• CVE-2010-4724Multiple unspecified vulnerabilities in the parser implementation in Smarty before 3.0.0 RC3 have unknown impact and remote attack vectors.
  41Plan

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.