Advanced Contact form 7 DB <= 1.6.0 - SQL Injection

2019-04-11 00:00
John Castro

Strategic Overview

Status
Patched in 1.6.1
Affected Plugin
Advanced Contact form 7 DB
Affected Version
< 1.6.1
CVSS
8.5High
Weakness type
CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE
CVE pending
View all Advanced Contact form 7 DB vulnerabilities

At a glance

This record tracks a high-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the Advanced Contact form 7 DB WordPress plugin, affecting versions < 1.6.1. It carries a CVSS score of 8.5 (reachable over the network; low attack complexity; high confidentiality impact). The issue is fixed in version 1.6.1; sites on affected versions should update now. Disclosed April 2019, reported by John Castro.

Vulnerability Overview

The Advanced Contact form 7 DB plugin for WordPress is vulnerable to SQL Injection via the 'acf7db' shortcode in versions before 1.6.1 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

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.

CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Advanced Contact form 7 DB < 1.6.1 carries this weakness at acf7db, and reaching it takes a caller who can reach the endpoint. SQL injection happens when request data is concatenated into a query instead of being bound as a parameter, letting an attacker change the structure of the statement rather than just its values.

A working injection can read any table the database user can see, which on a WordPress install means user records, password hashes and session or API secrets stored in options. For Advanced Contact form 7 DB the fix is 1.6.1: builds < 1.6.1 are affected, anything from 1.6.1 onward is not.

Remediation

Update to version 1.6.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Advanced Contact form 7 DB: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Advanced Contact form 7 DB 1.6.1 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/bf70f652-5244-421c-8ee6-75719315ed64

Related records

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