CVE-2015-4039

WP Membership <= 1.2.3 - Cross-Site Scripting

2015-05-21 00:00

Strategic Overview

Status: Unpatched
Affected Plugin: WP Membership
Affected Version: <= 1.2.3
CVSS: 5.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2015-4039

At a glance

CVE-2015-4039 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Membership WordPress plugin, affecting versions <= 1.2.3. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). No fixed release has been reported yet; treat installations running this software as exposed. Disclosed May 2015, reported by Panagiotis Vagenas.

Vulnerability Overview

Multiple cross-site scripting (XSS) vulnerabilities in the WP Membership plugin 1.2.3 for WordPress allow remote authenticated users to inject arbitrary web script or HTML via unspecified (1) profile fields or (2) new post content. NOTE: CVE-2015-4038 can be used to bypass the administrator confirmation step for vector 2.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in WP Membership <= 1.2.3 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. No fixed build of this plugin is recorded for WP Membership yet, so installs running <= 1.2.3 stay exposed until the vendor ships one.

Remediation

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

How does WordSec protect against this?

The attempt arrives as an ordinary request to WP Membership: WordSec's web application firewall inspects request payloads before WordPress loads them. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2015-4039 https://www.wordfence.com/threat-intel/vulnerabilities/id/443bae1e-21a0-44b3-bda0-a189f5c69a16 https://nvd.nist.gov/vuln/detail/CVE-2015-4039

Related records

Other vulnerabilities in WP Membership

CVSS Vector

5.4

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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