CVE-2021-26601: Impresscms/impresscms Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-4q96-9f63-p7jj
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CVSS 8.1
CWE-22
Published
Advisory Summary

CVE-2021-26601 is a HIGH (CVSS 8.1) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Impresscms/impresscms libraries in the Packagist ecosystem. The issue involves path traversal in impresscms. Remediation is available by upgrading affected packages to version 1.4.3.

CVE-2021-26601 at a Glance

CVE Identifier CVE-2021-26601
GHSA Identifier GHSA-4q96-9f63-p7jj
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Impresscms/impresscms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 None (C:N)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-26601

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: 1.4.3 
Upgrade impresscms/impresscms to 1.4.3
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-2021-26601, 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 1.4.3), 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 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 before 1.4.3 allows libraries/image-editor/image-edit.php image_temp Directory Traversal.

CVE-2021-26601 Affected Impresscms/impresscms Versions

1 component(s)
Fixed Versions:
1.4.3
Product / Package Ecosystem Affected Versions Fixed Version
impresscms/impresscms
 Packagist
< 1.4.3
1.4.3

References

NVD — CVE-2021-26601 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26601
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms/issues/914
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms/pull/915
hackerone.com/reports/1081878 WEB
https://hackerone.com/reports/1081878
Impresscms/impresscms Source Repository REPOSITORY
https://github.com/ImpressCMS/impresscms
Impresscms/impresscms Release RELEASE
https://github.com/ImpressCMS/impresscms/releases/tag/v1.4.3
Impresscms/impresscms Security Information SECURITY
http://karmainsecurity.com/KIS-2022-02
Impresscms/impresscms Security Information SECURITY
http://packetstormsecurity.com/files/166402/ImpressCMS-1.4.2-Path-Traversal.html
seclists.org/fulldisclosure/2022... WEB
http://seclists.org/fulldisclosure/2022/Mar/44

Frequently Asked Questions

What is CVE-2021-26601?
CVE-2021-26601 is a security vulnerability in Impresscms/impresscms involving Path Traversal in ImpressCMS under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Impresscms/impresscms versions are affected?
Affected versions include releases prior to 1.4.3 across affected packages: impresscms/impresscms.
What version fixes CVE-2021-26601?
Upgrading to 1.4.3 (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 1.4.3. Upgrade your dependency to 1.4.3 or later.
What is the CVSS score of CVE-2021-26601?
CVE-2021-26601 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2021-26601?
CVE-2021-26601 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-2021-26601?
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-4q96-9f63-p7jj",
  "modified" : "2022-03-30T19:53:50Z",
  "published" : "2022-03-29T00:01:16Z",
  "aliases" : [ "CVE-2021-26601" ],
  "summary" : "Path Traversal in ImpressCMS",
  "details" : "ImpressCMS before 1.4.3 allows libraries/image-editor/image-edit.php image_temp Directory Traversal.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "impresscms/impresscms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26601"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/issues/914"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/pull/915"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/1081878"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ImpressCMS/impresscms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImpressCMS/impresscms/releases/tag/v1.4.3"
  }, {
    "type" : "WEB",
    "url" : "http://karmainsecurity.com/KIS-2022-02"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/166402/ImpressCMS-1.4.2-Path-Traversal.html"
  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2022/Mar/44"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-03-30T19:53:50Z",
    "nvd_published_at" : "2022-03-28T01:15:00Z"
  }
}