CVE-2019-11872

Hustle <= 6.0.7 - Unauthenticated CSV Injection

2019-05-24 00:00

Strategic Overview

Status: Patched in 6.0.8.1
Affected Plugin: Hustle – Email Marketing, Lead Generation, Optins, Popups
Affected Version: <= 6.0.7
CVSS: 7.8High
Weakness type: CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CVE: CVE-2019-11872

View all Hustle – Email Marketing, Lead Generation, Optins, Popups vulnerabilities

At a glance

CVE-2019-11872 is a high-severity Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the Hustle WordPress plugin, affecting versions <= 6.0.7. It carries a CVSS score of 7.8 (low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 6.0.8.1; sites on affected versions should update now. Disclosed May 2019, reported by Mark Parfeniuk.

Vulnerability Overview

The Hustle (aka wordpress-popup) plugin 6.0.7 for WordPress is vulnerable to CSV Injection as it allows for injecting malicious code into a pop-up window. Successful exploitation grants an attacker with a right to execute malicious code on the administrator's computer through Excel functions as the plugin does not sanitize the user's input and allows insertion of any text.

Technical Analysis

The vector marks this flaw as requiring local or adjacent access, 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-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Remediation

Update to version 6.0.8.1, 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. None of that substitutes for the fix: Hustle 6.0.8.1 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2019-11872 https://www.wordfence.com/threat-intel/vulnerabilities/id/57d0991b-f10e-4ab8-a8a2-55bf708eefee https://nvd.nist.gov/vuln/detail/CVE-2019-11872

Related records

Other vulnerabilities in Hustle – Email Marketing, Lead Generation, Optins, Popups

CVSS Vector

7.8

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

Base

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

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