CVE-2023-5762

Filr – Secure document library <= 1.2.3.5 - Authenticated (Author+) Arbitrary File Upload

2023-11-13 00:00
Dmitrii Ignatyev

Strategic Overview

Status
Patched in 1.2.3.6
Affected Plugin
Filr – Secure document library
Affected Version
< 1.2.3.6
CVSS
8.8High
Weakness type
CWE-94 · Improper Control of Generation of Code ('Code Injection')
CVE
CVE-2023-5762
View all Filr – Secure document library vulnerabilities

At a glance

CVE-2023-5762 is a high-severity Improper Control of Generation of Code ('Code Injection') vulnerability in the Filr WordPress plugin, affecting versions < 1.2.3.6. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Author level or above. The issue is fixed in version 1.2.3.6; sites on affected versions should update now. Disclosed November 2023, reported by Dmitrii Ignatyev.

Vulnerability Overview

The Filr – Secure document library plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in all versions up to 1.2.3.5 (inclusive). This makes it possible for authenticated attackers, with author-level or above, to upload arbitrary files on the affected site's server which may make remote code execution possible.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-94: Improper Control of Generation of Code ('Code Injection')

Reaching this weakness in Filr < 1.2.3.6 takes an account at Author level or above. Code injection means input from a request reaches a language construct that evaluates code, so the attacker's text is executed rather than treated as data.

The injected code runs with the web server's privileges, giving the attacker the same access to the database and filesystem as WordPress itself. For Filr the fix is 1.2.3.6: builds < 1.2.3.6 are affected, anything from 1.2.3.6 onward is not.

Remediation

Update to version 1.2.3.6, or a newer patched version

How does WordSec protect against this?

An attacker needs Author access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Filr 1.2.3.6 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-5762https://www.wordfence.com/threat-intel/vulnerabilities/id/ee23629c-6147-4527-929f-8c932cd7d7a7https://nvd.nist.gov/vuln/detail/CVE-2023-5762

Related records

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