CVE-2016-10914

Add From Server <= 3.3.1 - Cross-Site Request Forgery

2016-08-08 00:00

Strategic Overview

Status: Patched in 3.3.2
Affected Plugin: Add From Server
Affected Version: < 3.3.2
CVSS: 8.8High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2016-10914

View all Add From Server vulnerabilities

At a glance

CVE-2016-10914 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Add From Server WordPress plugin, affecting versions < 3.3.2. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 3.3.2; sites on affected versions should update now. Disclosed August 2016, reported by Edwin Molenaar.

Vulnerability Overview

The add-from-server plugin before 3.3.2 for WordPress has CSRF for importing a large file.

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Add From Server < 3.3.2 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Add From Server the fix is 3.3.2: builds < 3.3.2 are affected, anything from 3.3.2 onward is not.

Remediation

Update to version 3.3.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Add From Server: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Add From Server 3.3.2 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2016-10914 https://www.wordfence.com/threat-intel/vulnerabilities/id/6d9a3ad3-90fa-46bc-b42a-7616c02a8b50 https://nvd.nist.gov/vuln/detail/CVE-2016-10914

CVSS Vector

8.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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