CVE-2017-16815

Duplicator <= 1.2.28 – Unauthenticated Stored Cross-Site Scripting

2017-11-07 00:00

Strategic Overview

Status: Patched in 1.2.30
Affected Plugin: Duplicator – Backups & Migration Plugin – Cloud Backups, Scheduled Backups, & More
Affected Version: <= 1.2.28
CVSS: 6.1Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2017-16815

View all Duplicator – Backups & Migration Plugin – Cloud Backups, Scheduled Backups, & More vulnerabilities

At a glance

CVE-2017-16815 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Duplicator WordPress plugin, affecting versions <= 1.2.28. 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 1.2.30; sites on affected versions should update now. Disclosed November 2017.

Vulnerability Overview

installer.php in the Snap Creek Duplicator (WordPress Site Migration & Backup) plugin before 1.2.30 for WordPress has XSS because the values "url_new" (/wp-content/plugins/duplicator/installer/build/view.step4.php) and "logging" (wp-content/plugins/duplicator/installer/build/view.step2.php) are not filtered correctly.

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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Duplicator <= 1.2.28 carries this weakness at url_new, and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Duplicator the fix is 1.2.30: builds <= 1.2.28 are affected, anything from 1.2.30 onward is not.

Remediation

Update to version 1.2.30, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Duplicator 1.2.30 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2017-16815 https://www.wordfence.com/threat-intel/vulnerabilities/id/9bdf7b10-6a3e-47aa-86ae-479b4cd29c49 https://nvd.nist.gov/vuln/detail/CVE-2017-16815

Related records

Same weakness class

Other vulnerabilities in Duplicator – Backups & Migration Plugin – Cloud Backups, Scheduled Backups, & More

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

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/