CVE-2020-17551: Impresscms/impresscms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-j29g-g982-pwpv
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CVSS 4.8
CWE-79
Published
Advisory Summary

CVE-2020-17551 is a MODERATE (CVSS 4.8) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Impresscms/impresscms libraries in the Packagist ecosystem. The issue involves cross-site scripting (xss). Remediation is available by upgrading affected packages to version 1.4.1.

CVE-2020-17551 at a Glance

CVE Identifier CVE-2020-17551
GHSA Identifier GHSA-j29g-g982-pwpv
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Impresscms/impresscms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.8

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

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

How to Fix CVE-2020-17551

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

impresscms/impresscms fixed: 1.4.1 
Upgrade impresscms/impresscms to 1.4.1
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 impresscms/impresscms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-17551, inspect your project dependencies for Impresscms/impresscms:

inspect dependencies for impresscms/impresscms

Analyze the terminal output to locate any version of Impresscms/impresscms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.1), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Impresscms/impresscms, 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

ImpressCMS 1.4.0 is affected by XSS in modules/system/admin.php which may result in arbitrary remote code execution.

CVE-2020-17551 Affected Impresscms/impresscms Versions

1 component(s)
Fixed Versions:
1.4.1
Product / Package Ecosystem Affected Versions Fixed Version
impresscms/impresscms
 Packagist
< 1.4.1
1.4.1

References

NVD — CVE-2020-17551 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-17551
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms/issues/659
www.impresscms.org WEB
https://www.impresscms.org

Frequently Asked Questions

What is CVE-2020-17551?
CVE-2020-17551 is a security vulnerability in Impresscms/impresscms involving Cross-site scripting (XSS) under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Impresscms/impresscms versions are affected?
Affected versions include releases prior to 1.4.1 across affected packages: impresscms/impresscms.
What version fixes CVE-2020-17551?
Upgrading to 1.4.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is impresscms/impresscms affected?
Yes, impresscms/impresscms is affected in releases prior to 1.4.1. Upgrade your dependency to 1.4.1 or later.
What is the CVSS score of CVE-2020-17551?
CVE-2020-17551 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-17551?
CVE-2020-17551 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2020-17551?
Run the dependency tree command: 'inspect dependencies for impresscms/impresscms'. 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-j29g-g982-pwpv",
  "modified" : "2021-03-12T20:09:58Z",
  "published" : "2021-03-12T21:34:11Z",
  "aliases" : [ "CVE-2020-17551" ],
  "summary" : "Cross-site scripting (XSS)",
  "details" : "ImpressCMS 1.4.0 is affected by XSS in modules/system/admin.php which may result in arbitrary remote code execution.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "impresscms/impresscms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.4.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-17551"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/issues/659"
  }, {
    "type" : "WEB",
    "url" : "https://www.impresscms.org"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-12T20:09:58Z",
    "nvd_published_at" : "2020-10-07T17:15:00Z"
  }
}