CVE-2021-24867

AccessPress Anonymous Post = 2.8.0 - Backdoored

2021-10-13 00:00

Strategic Overview

Status: Patched in 2.8.1
Affected Plugin: Frontend Post WordPress Plugin – AccessPress Anonymous Post
Affected Version: 2.8.0
CVSS: 8.8High
Weakness type: CWE-912 · Hidden Functionality
CVE: CVE-2021-24867

View all Frontend Post WordPress Plugin – AccessPress Anonymous Post vulnerabilities

At a glance

CVE-2021-24867 is a high-severity Hidden Functionality vulnerability in the Frontend Post WordPress Plugin WordPress plugin, affecting versions 2.8.0. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.8.1; sites on affected versions should update now. Disclosed October 2021, reported by Harald Eilertsen.

Vulnerability Overview

Numerous Plugins and Themes from the AccessPress Themes (aka Access Keys) vendor are backdoored due to their website being compromised. Only plugins and themes downloaded via the vendor website are affected, and those hosted on wordpress.org are not. However, all of them were updated or removed to avoid any confusion

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. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-912: Hidden Functionality

The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators.

Remediation

Update to version 2.8.1, or a newer patched version

How does WordSec protect against this?

Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Frontend Post WordPress Plugin 2.8.1 closes this, and updating the plugin is the step that ends it.

Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24867 https://www.wordfence.com/threat-intel/vulnerabilities/id/415ace14-1687-4003-b385-a21a5d5e16a7 https://nvd.nist.gov/vuln/detail/CVE-2021-24867

Related records

CVSS Vector

8.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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