CVE-2020-35945

Elegant Themes (Multiple Versions) - Arbitrary File Upload

2020-08-03 00:00

Strategic Overview

Status: Patched in 4.5.3
Affected Theme: Divi
Affected Version: <= 4.3.2
CVSS: 8.8High
Weakness type: CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE: CVE-2020-35945

At a glance

CVE-2020-35945 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Divi WordPress theme, affecting versions <= 4.3.2. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). The issue is fixed in version 4.5.3; sites on affected versions should update now. Disclosed August 2020, reported by Chloe Chamberland.

Vulnerability Overview

An issue was discovered in the Divi Builder plugin, Divi theme, and Divi Extra theme before 4.5.3 for WordPress. Authenticated attackers, with contributor-level or above capabilities, can upload arbitrary files, including .php files. This occurs because the check for file extensions is on the client side rather than server side.

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-434: Unrestricted Upload of File with Dangerous Type

Reaching this weakness in Divi <= 4.3.2 takes a caller who can reach the endpoint. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For Divi the fix is 4.5.3: builds <= 4.3.2 are affected, anything from 4.5.3 onward is not.

Remediation

Update to version 4.5.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Divi: 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: Divi 4.5.3 closes this, and updating the theme is the step that ends it.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-35945 https://www.wordfence.com/threat-intel/vulnerabilities/id/3e03bc79-b42e-4015-8476-2b0488c71028 https://nvd.nist.gov/vuln/detail/CVE-2020-35945

Related records

Other vulnerabilities in Divi

CVSS Vector

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/