CVE-2018-18461

Arigato Autoresponder and Newsletter <= 2.7 - Arbitrary File Upload

2018-10-17 00:00

Strategic Overview

Status: Unpatched
Affected Plugin: Arigato Autoresponder and Newsletter
Affected Version: *
CVSS: 9.8Critical
Weakness type: CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE: CVE-2018-18461

View all Arigato Autoresponder and Newsletter vulnerabilities

At a glance

CVE-2018-18461 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Arigato Autoresponder and Newsletter WordPress plugin, affecting versions *. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed October 2018, reported by rakjong.

Vulnerability Overview

The Arigato Autoresponder and Newsletter (aka bft-autoresponder) v2.5.1.7 plugin for WordPress allows remote attackers to execute arbitrary code via PHP code in attachments[] data to models/attachment.php.This plugin does not appear to be patched based on our review.

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 confidentiality, integrity, availability — full site compromise territory.

CWE-434: Unrestricted Upload of File with Dangerous Type

Reaching this weakness in Arigato Autoresponder and Newsletter * takes a caller who can reach the endpoint. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. No fixed build of this plugin is recorded for Arigato Autoresponder and Newsletter yet, so installs running * stay exposed until the vendor ships one.

Remediation

No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.

How does WordSec protect against this?

The attempt arrives as an ordinary request to Arigato Autoresponder and Newsletter: WordSec's web application firewall inspects request payloads before WordPress loads them. 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. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-18461 https://www.wordfence.com/threat-intel/vulnerabilities/id/1d87d225-7de4-49f8-9cba-391d718af7fd https://nvd.nist.gov/vuln/detail/CVE-2018-18461

Related records

Other vulnerabilities in Arigato Autoresponder and Newsletter

CVSS Vector

9.8

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

Base

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

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