CVE-2018-13982: Smarty/smarty Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-7gfx-wxfh-7rvm
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CVSS 7.5
CWE-22
Published
Advisory Summary

CVE-2018-13982 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Smarty/smarty libraries in the Packagist ecosystem. The issue involves smarty path traversal vulnerability. Remediation is available by upgrading affected packages to version 3.1.33.

CVE-2018-13982 at a Glance

CVE Identifier CVE-2018-13982
GHSA Identifier GHSA-7gfx-wxfh-7rvm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Smarty/smarty
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2018-13982

To remediate this vulnerability, upgrade all affected Smarty/smarty dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

smarty/smarty fixed: 3.1.33 
Upgrade smarty/smarty to 3.1.33
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for smarty/smarty

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-13982, inspect your project dependencies for Smarty/smarty:

inspect dependencies for smarty/smarty

Analyze the terminal output to locate any version of Smarty/smarty in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.33), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Smarty/smarty, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

`Smarty_Security::isTrustedResourceDir()` in Smarty before 3.1.33 is prone to a path traversal vulnerability due to insufficient template code sanitization. This allows attackers controlling the executed template code to bypass the trusted directory security restriction and read arbitrary files.

CVE-2018-13982 Affected Smarty/smarty Versions

1 component(s)
Fixed Versions:
3.1.33
Product / Package Ecosystem Affected Versions Fixed Version
smarty/smarty
 Packagist
< 3.1.33
3.1.33

References

NVD — CVE-2018-13982 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-13982
Security Fix Commit FIX COMMIT
https://github.com/smarty-php/smarty/commit/2e081a51b1effddb23f87952959139ac62654d50
Security Fix Commit FIX COMMIT
https://github.com/smarty-php/smarty/commit/8d21f38dc35c4cd6b31c2f23fc9b8e5adbc56dfe
Security Fix Commit FIX COMMIT
https://github.com/smarty-php/smarty/commit/bcedfd6b58bed4a7366336979ebaa5a240581531
Security Fix Commit FIX COMMIT
https://github.com/smarty-php/smarty/commit/c9dbe1d08c081912d02bd851d1d1b6388f6133d1
Security Fix Commit FIX COMMIT
https://github.com/smarty-php/smarty/commit/f9ca3c63d1250bb56b2bda609dcc9dd81f0065f8
Smarty/smarty Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2018-13982.yaml
GitHub Advisory / Wiki ADVISORY
https://github.com/sbaresearch/advisories/tree/public/2018/SBA-ADV-20180420-01_Smarty_Path_Traversal
Smarty/smarty Source Repository REPOSITORY
https://github.com/smarty-php/smarty
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2021/10/msg00015.html

Frequently Asked Questions

What is CVE-2018-13982?
CVE-2018-13982 is a security vulnerability in Smarty/smarty involving Smarty Path Traversal Vulnerability under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Smarty/smarty versions are affected?
Affected versions include releases prior to 3.1.33 across affected packages: smarty/smarty.
What version fixes CVE-2018-13982?
Upgrading to 3.1.33 (or the latest patched release for your respective branch) resolves the vulnerability.
Is smarty/smarty affected?
Yes, smarty/smarty is affected in releases prior to 3.1.33. Upgrade your dependency to 3.1.33 or later.
What is the CVSS score of CVE-2018-13982?
CVE-2018-13982 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-13982?
CVE-2018-13982 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check Packagist dependencies for CVE-2018-13982?
Run the dependency tree command: 'inspect dependencies for smarty/smarty'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7gfx-wxfh-7rvm",
  "modified" : "2023-10-05T19:28:48Z",
  "published" : "2022-05-13T01:05:24Z",
  "aliases" : [ "CVE-2018-13982" ],
  "summary" : "Smarty Path Traversal Vulnerability",
  "details" : "`Smarty_Security::isTrustedResourceDir()` in Smarty before 3.1.33 is prone to a path traversal vulnerability due to insufficient template code sanitization. This allows attackers controlling the executed template code to bypass the trusted directory security restriction and read arbitrary files.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "smarty/smarty"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.33"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-13982"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/smarty-php/smarty/commit/2e081a51b1effddb23f87952959139ac62654d50"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/smarty-php/smarty/commit/8d21f38dc35c4cd6b31c2f23fc9b8e5adbc56dfe"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/smarty-php/smarty/commit/bcedfd6b58bed4a7366336979ebaa5a240581531"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/smarty-php/smarty/commit/c9dbe1d08c081912d02bd851d1d1b6388f6133d1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/smarty-php/smarty/commit/f9ca3c63d1250bb56b2bda609dcc9dd81f0065f8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/smarty/smarty/CVE-2018-13982.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sbaresearch/advisories/tree/public/2018/SBA-ADV-20180420-01_Smarty_Path_Traversal"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/smarty-php/smarty"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2021/04/msg00004.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2021/04/msg00014.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2021/10/msg00015.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-19T23:14:57Z",
    "nvd_published_at" : "2018-09-18T21:29:00Z"
  }
}