CVE-2015-10140

WordPress Infinite Scroll – Ajax Load More <= 2.8.1.1 - Arbitrary File Upload

2015-10-10 00:00
PizzaHatHacker

Strategic Overview

Status
Patched in 2.8.1.2
Affected Plugin
Ajax Load More – Infinite Scroll, Load More, & Lazy Load
Affected Version
<= 2.8.1.1
CVSS
8.8High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2015-10140
View all Ajax Load More – Infinite Scroll, Load More, & Lazy Load vulnerabilities

At a glance

CVE-2015-10140 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Ajax Load More WordPress plugin, affecting versions <= 2.8.1.1. 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 2.8.1.2; sites on affected versions should update now. Disclosed October 2015, reported by PizzaHatHacker.

Vulnerability Overview

The WordPress Infinite Scroll – Ajax Load More plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'alm_save_repeater()' function called via an AJAX action in versions up to, and including, 2.8.1.2. This makes it possible for authenticated attackers 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-434: Unrestricted Upload of File with Dangerous Type

Ajax Load More <= 2.8.1.1 carries this weakness at alm_save_repeater(), and reaching it 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 Ajax Load More the fix is 2.8.1.2: builds <= 2.8.1.1 are affected, anything from 2.8.1.2 onward is not.

Remediation

Update to version 2.8.1.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Ajax Load More: 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: Ajax Load More 2.8.1.2 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2015-10140https://www.wordfence.com/threat-intel/vulnerabilities/id/10e98088-423d-45bb-ae90-51e895d2929bhttps://nvd.nist.gov/vuln/detail/CVE-2015-10140

Related records

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