CVE-2016-10958

Estatik <= 2.2.5 - Unauthenticated Arbitrary File Upload

2016-08-01 00:00
Anonymous

Strategic Overview

Status
Patched in 2.3.1
Affected Plugin
Estatik Real Estate Plugin
Affected Version
<= 2.3.0
CVSS
9.8Critical
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2016-10958
View all Estatik Real Estate Plugin vulnerabilities

At a glance

CVE-2016-10958 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Estatik Real Estate Plugin WordPress plugin, affecting versions <= 2.3.0. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.3.1; sites on affected versions should update now. Disclosed August 2016.

Vulnerability Overview

The estatik plugin before 2.3.0 for WordPress has unauthenticated arbitrary file upload via es_media_images[] to wp-admin/admin-ajax.php.

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 privileges on the target site, 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 Estatik Real Estate Plugin <= 2.3.0 takes no account at all. 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 Estatik Real Estate Plugin the fix is 2.3.1: builds <= 2.3.0 are affected, anything from 2.3.1 onward is not.

Remediation

Update to version 2.3.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: 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: Estatik Real Estate Plugin 2.3.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Login Security

External References

https://www.cve.org/CVERecord?id=CVE-2016-10958https://www.wordfence.com/threat-intel/vulnerabilities/id/64188179-1d7d-476f-866c-62bc10c85a3dhttps://nvd.nist.gov/vuln/detail/CVE-2016-10958

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C