CVE-2020-9372

Appointment Booking Calendar <= 1.3.34 - CSV Injection

2020-03-04 00:00

Strategic Overview

Status: Patched in 1.3.35
Affected Plugin: Appointment Booking Calendar
Affected Version: < 1.3.35
CVSS: 7.8High
Weakness type: CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CVE: CVE-2020-9372

View all Appointment Booking Calendar vulnerabilities

At a glance

CVE-2020-9372 is a high-severity Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the Appointment Booking Calendar WordPress plugin, affecting versions < 1.3.35. 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 1.3.35; sites on affected versions should update now. Disclosed March 2020, reported by Daniel Monzón.

Vulnerability Overview

The Appointment Booking Calendar plugin before 1.3.35 for WordPress allows user input (in fields such as Description or Name) in any booking form to be any formula, which then could be exported via the Bookings list tab in /wp-admin/admin.php?page=cpabc_appointments.php. The attacker could achieve remote code execution via CSV injection.

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 1.3.35, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Appointment Booking Calendar: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Booking Calendar 1.3.35 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-9372 https://www.wordfence.com/threat-intel/vulnerabilities/id/25b26369-76e3-44f0-8275-03fc6fc9705c https://nvd.nist.gov/vuln/detail/CVE-2020-9372

Related records

Other vulnerabilities in Appointment Booking Calendar

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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