CVE-2018-5671

Booking calendar, Appointment Booking System <= 2.1.7 - Cross-Site Scripting

2018-01-11 00:00

Strategic Overview

Status: Patched in 2.1.8
Affected Plugin: Booking calendar, Appointment Booking System
Affected Version: < 2.1.8
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2018-5671

View all Booking calendar, Appointment Booking System vulnerabilities

At a glance

CVE-2018-5671 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Booking calendar, Appointment Booking System WordPress plugin, affecting versions < 2.1.8. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). The issue is fixed in version 2.1.8; sites on affected versions should update now. Disclosed January 2018, reported by d4wner.

Vulnerability Overview

An issue was discovered in the booking-calendar plugin 2.1.7 for WordPress. XSS exists via the wp-admin/admin.php extra_field1[items][field_item1][price_percent] 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.

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

Reaching this weakness in Booking calendar, Appointment Booking System < 2.1.8 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. For Booking calendar, Appointment Booking System the fix is 2.1.8: builds < 2.1.8 are affected, anything from 2.1.8 onward is not.

Remediation

Update to version 2.1.8, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Booking calendar, Appointment Booking System: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Booking calendar, Appointment Booking System 2.1.8 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-5671 https://www.wordfence.com/threat-intel/vulnerabilities/id/8ebc05b6-89dd-4373-a632-75c783716643 https://nvd.nist.gov/vuln/detail/CVE-2018-5671

Related records

Same weakness class

Other vulnerabilities in Booking calendar, Appointment Booking System

CVSS Vector

5.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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