CVE-2018-0587

Ultimate Member < 2.0.4 - Authenticated Unrestricted File Upload

2018-05-10 00:00

Strategic Overview

Status: Patched in 2.0.4
Affected Plugin: Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
Affected Version: < 2.0.4
CVSS: 4.3Medium
Weakness type: CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE: CVE-2018-0587

View all Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin vulnerabilities

At a glance

CVE-2018-0587 is a medium-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Ultimate Member WordPress plugin, affecting versions < 2.0.4. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 2.0.4; sites on affected versions should update now. Disclosed May 2018, reported by Gen Sato.

Vulnerability Overview

The Ultimate Member plugin for WordPress is vulnerable to unrestricted file uploads in versions prior to version 2.0.4. This makes it possible for authenticated attackers to upload arbitrary image files via unspecified vectors.

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 interaction from a victim user.

CWE-434: Unrestricted Upload of File with Dangerous Type

Reaching this weakness in Ultimate Member < 2.0.4 takes any authenticated account. 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. For Ultimate Member the fix is 2.0.4: builds < 2.0.4 are affected, anything from 2.0.4 onward is not.

Remediation

Update to version 2.0.4, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Ultimate Member: 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. None of that substitutes for the fix: Ultimate Member 2.0.4 closes this, and updating the plugin is the step that ends it.

Firewall
Scanner
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-0587 https://www.wordfence.com/threat-intel/vulnerabilities/id/bc2af96c-09c5-4ddf-a910-04291aeeef49 https://nvd.nist.gov/vuln/detail/CVE-2018-0587

Related records

Same weakness class

8.8Ultimate Member <= 2.0.21 Arbitrary File Upload

Other vulnerabilities in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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