CVE-2018-20556

Booking Calendar <= 8.4.3 - SQL injection

2018-12-28 00:00

Strategic Overview

Status: Patched in 8.4.4
Affected Plugin: Booking Calendar
Affected Version: <= 8.4.3
CVSS: 8.8High
Weakness type: CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
CVE: CVE-2018-20556

View all Booking Calendar vulnerabilities

At a glance

CVE-2018-20556 is a high-severity Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in the Booking Calendar WordPress plugin, affecting versions <= 8.4.3. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). The issue is fixed in version 8.4.4; sites on affected versions should update now. Disclosed December 2018, reported by B0UG.

Vulnerability Overview

SQL injection vulnerability in Booking Calendar plugin 8.4.3 for WordPress allows remote attackers to execute arbitrary SQL commands via the booking_id parameter.

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, integrity, availability — full site compromise territory.

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

Reaching this weakness in Booking Calendar <= 8.4.3 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 Booking Calendar the fix is 8.4.4: builds <= 8.4.3 are affected, anything from 8.4.4 onward is not.

Remediation

Update to version 8.4.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Booking Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Booking Calendar 8.4.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-20556 https://www.wordfence.com/threat-intel/vulnerabilities/id/93a4d653-a852-41c1-8942-8f059420aeb1 https://nvd.nist.gov/vuln/detail/CVE-2018-20556

Related records

Same weakness class

Other vulnerabilities in Booking Calendar

CVSS Vector

8.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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