CVE-2018-20717: Prestashop/prestashop PrestaShop PHP Object Injection Vulnerability

HIGH
Advisory Identifier: GHSA-xx67-2j3v-h76p
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CVSS 8.8
CWE-94
Published
Advisory Summary

CVE-2018-20717 is a HIGH (CVSS 8.8) prestashop php object injection vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Prestashop/prestashop libraries in the Packagist ecosystem. The issue involves prestashop php object injection. Remediation is available by upgrading affected packages to version 1.7.2.5.

CVE-2018-20717 at a Glance

CVE Identifier CVE-2018-20717
GHSA Identifier GHSA-xx67-2j3v-h76p
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Prestashop/prestashop
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2018-20717

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

prestashop/prestashop fixed: 1.7.2.5 
Upgrade prestashop/prestashop to 1.7.2.5
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 prestashop/prestashop

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-20717, inspect your project dependencies for Prestashop/prestashop:

inspect dependencies for prestashop/prestashop

Analyze the terminal output to locate any version of Prestashop/prestashop in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7.2.5), 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Prestashop/prestashop, 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

In the orders section of PrestaShop before 1.7.2.5, an attack is possible after gaining access to a target store with a user role with the rights of at least a Salesman or higher privileges. The attacker can then inject arbitrary PHP objects into the process and abuse an object chain in order to gain Remote Code Execution. This occurs because protection against serialized objects looks for a `0:` followed by an integer, but does not consider `0:+` followed by an integer.

CVE-2018-20717 Affected Prestashop/prestashop Versions

1 component(s)
Fixed Versions:
1.7.2.5
Product / Package Ecosystem Affected Versions Fixed Version
prestashop/prestashop
 Packagist
< 1.7.2.5
1.7.2.5

References

NVD — CVE-2018-20717 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20717
blog.ripstech.com/2018/prestashop-rem... WEB
https://blog.ripstech.com/2018/prestashop-remote-code-execution
build.prestashop.com/news/prestashop-1-7... WEB
https://build.prestashop.com/news/prestashop-1-7-2-5-maintenance-release
Prestashop/prestashop Source Repository REPOSITORY
https://github.com/PrestaShop/PrestaShop

Frequently Asked Questions

What is CVE-2018-20717?
CVE-2018-20717 is a security vulnerability in Prestashop/prestashop involving PrestaShop PHP Object Injection under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Prestashop/prestashop versions are affected?
Affected versions include releases prior to 1.7.2.5 across affected packages: prestashop/prestashop.
What version fixes CVE-2018-20717?
Upgrading to 1.7.2.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is prestashop/prestashop affected?
Yes, prestashop/prestashop is affected in releases prior to 1.7.2.5. Upgrade your dependency to 1.7.2.5 or later.
What is the CVSS score of CVE-2018-20717?
CVE-2018-20717 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-20717?
CVE-2018-20717 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check Packagist dependencies for CVE-2018-20717?
Run the dependency tree command: 'inspect dependencies for prestashop/prestashop'. 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-xx67-2j3v-h76p",
  "modified" : "2023-10-06T15:40:15Z",
  "published" : "2022-05-14T01:37:11Z",
  "aliases" : [ "CVE-2018-20717" ],
  "summary" : "PrestaShop PHP Object Injection",
  "details" : "In the orders section of PrestaShop before 1.7.2.5, an attack is possible after gaining access to a target store with a user role with the rights of at least a Salesman or higher privileges. The attacker can then inject arbitrary PHP objects into the process and abuse an object chain in order to gain Remote Code Execution. This occurs because protection against serialized objects looks for a `0:` followed by an integer, but does not consider `0:+` followed by an integer.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "prestashop/prestashop"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.7.2.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-20717"
  }, {
    "type" : "WEB",
    "url" : "https://blog.ripstech.com/2018/prestashop-remote-code-execution"
  }, {
    "type" : "WEB",
    "url" : "https://build.prestashop.com/news/prestashop-1-7-2-5-maintenance-release"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/PrestaShop/PrestaShop"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-24T22:14:18Z",
    "nvd_published_at" : "2019-01-15T16:29:00Z"
  }
}