CVE-2019-15863

ConvertPlus <= 3.4.4 - Unauthorized Account Creation

2019-06-07 00:00

Strategic Overview

Status: Patched in 3.4.5
Affected Plugin: ConvertPlus
Affected Version: <= 3.4.4
CVSS: 7.5High
Weakness type: CWE-285 · Improper Authorization
CVE: CVE-2019-15863

At a glance

CVE-2019-15863 is a high-severity Improper Authorization vulnerability in the ConvertPlus WordPress plugin, affecting versions <= 3.4.4. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high integrity impact). Exploitation requires no authentication. The issue is fixed in version 3.4.5; sites on affected versions should update now. Disclosed June 2019.

Vulnerability Overview

The ConvertPlus plugin before 3.4.5 for WordPress has an unintended account creation (with the none role) via a request for variants.

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, and no interaction from a victim user. A successful exploit has high impact on integrity.

CWE-285: Improper Authorization

Reaching this weakness in ConvertPlus <= 3.4.4 takes a caller who can reach the endpoint. Improper authorization means a permission check exists but does not cover the case being exercised, so a caller who is allowed to do one thing is allowed to do a neighbouring thing as well.

A lower-privileged account performs an action reserved for a higher one, which on a multi-author or membership site means an ordinary user reaching administrative behaviour. For ConvertPlus the fix is 3.4.5: builds <= 3.4.4 are affected, anything from 3.4.5 onward is not.

Remediation

Update to version 3.4.5, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: ConvertPlus 3.4.5 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2019-15863 https://www.wordfence.com/threat-intel/vulnerabilities/id/c1836b1e-6c37-4a07-ac29-687d2eebd3ec https://nvd.nist.gov/vuln/detail/CVE-2019-15863

Related records

Other vulnerabilities in ConvertPlus

CVSS Vector

7.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone

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