CVE-2019-6780

Wise Chat <= 2.6.3 - Reverse Tabnabbing

2019-01-25 00:00

Strategic Overview

Status: Patched in 2.7
Affected Plugin: Wise Chat
Affected Version: < 2.7
CVSS: 6.1Medium
Weakness type: CWE-20 · Improper Input Validation
CVE: CVE-2019-6780

At a glance

CVE-2019-6780 is a medium-severity Improper Input Validation vulnerability in the Wise Chat WordPress plugin, affecting versions < 2.7. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.7; sites on affected versions should update now. Disclosed January 2019, reported by MTK (Muhammad Talha Khan).

Vulnerability Overview

The Wise Chat plugin for WordPress is vulnerable to Reverse Tabnabbing in versions up to, and including, 2.6.3. This is due to mishandling of external links due to omitting noopener and noreferrer. This makes it possible for a chat-using attacker to provide a link that opens a new tab while silently redirecting the original - this can be used to redirect them to a phishing site on the original tab.

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-20: Improper Input Validation

Reaching this weakness in Wise Chat < 2.7 takes a caller who can reach the endpoint. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.

The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Wise Chat the fix is 2.7: builds < 2.7 are affected, anything from 2.7 onward is not.

Remediation

Update to version 2.7, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Wise Chat: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Wise Chat 2.7 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2019-6780 https://www.wordfence.com/threat-intel/vulnerabilities/id/c46b26c7-3302-4730-915c-1882b315600c https://nvd.nist.gov/vuln/detail/CVE-2019-6780

Related records

Other vulnerabilities in Wise Chat

CVSS Vector

6.1

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

Base

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

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