CVE-2022-27852

KB Support – WordPress Help Desk <= 1.5.5 - Multiple Unauthenticated Stored Cross-Site Scripting

2022-04-15 13:36

Strategic Overview

Status: Patched in 1.5.6
Affected Plugin: KB Support – Customer Support Ticket & Helpdesk Plugin, Knowledge Base Plugin
Affected Version: <= 1.5.5
CVSS: 4.7Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2022-27852

View all KB Support – Customer Support Ticket & Helpdesk Plugin, Knowledge Base Plugin vulnerabilities

At a glance

CVE-2022-27852 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the KB Support WordPress plugin, affecting versions <= 1.5.5. It carries a CVSS score of 4.7 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.5.6; sites on affected versions should update now. Disclosed April 2022, reported by Ngo Van Thien.

Vulnerability Overview

The plugin KB Support – WordPress Help Desk versions up to 1.5.5 are vulnerable to Cross-Site Scripting. The vulnerabilities allow unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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 privileges on the target site.

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

Reaching this weakness in KB Support <= 1.5.5 takes no account at all. 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 KB Support the fix is 1.5.6: builds <= 1.5.5 are affected, anything from 1.5.6 onward is not.

Remediation

Update to version 1.5.6, 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: KB Support 1.5.6 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-2022-27852 https://www.wordfence.com/threat-intel/vulnerabilities/id/3aeb5e01-0993-4628-8165-b27470332e34 https://nvd.nist.gov/vuln/detail/CVE-2022-27852

Related records

Other vulnerabilities in KB Support – Customer Support Ticket & Helpdesk Plugin, Knowledge Base Plugin

CVSS Vector

4.7

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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