CVE-2013-4339

WordPress Core < 3.6.1 - Open Redirect

2013-09-11 00:00

Strategic Overview

Status: Patched in 3.6.1
Affected Core: WordPress 3.6
Affected Version: <= 3.6
CVSS: 5.4Medium
Weakness type: CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE: CVE-2013-4339

At a glance

CVE-2013-4339 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the WordPress 3.6 WordPress release line, affecting <= 3.6. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). The issue is fixed in version 3.6.1; sites on affected versions should update now. Disclosed September 2013, reported by Dave Cummo.

Vulnerability Overview

WordPress before 3.6.1 does not properly validate URLs before use in an HTTP redirect, which allows remote attackers to bypass intended redirection restrictions via a crafted string.

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.

CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

Reaching this weakness in WordPress 3.6 <= 3.6 takes a caller who can reach the endpoint. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.

A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For WordPress 3.6 the fix is 3.6.1: builds <= 3.6 are affected, anything from 3.6.1 onward is not.

Remediation

Update to version 3.6.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WordPress 3.6: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: updating to 3.6.1 is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2013-4339 https://www.wordfence.com/threat-intel/vulnerabilities/id/45adeeba-22b0-4758-bc21-afc019653ce8 https://nvd.nist.gov/vuln/detail/CVE-2013-4339

Related records

Same weakness class

Other vulnerabilities in WordPress 3.6

CVSS Vector

5.4

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityLow

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