WordPress 3.9.3/4.1.1/4.1.2/4.2 Comment Stored cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in WordPress 3.9.3/4.1.1/4.1.2/4.2. This issue affects some unknown processing of the component Comment Handler. Executing a manipulation can lead to cross site scripting (Stored). This vulnerability is tracked as CVE-2015-3440. The attack can be launched remotely. Moreover, an exploit is present. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in WordPress 3.9.3/4.1.1/4.1.2/4.2 (Content Management System). It has been declared as problematic. This vulnerability affects some unknown functionality of the component Comment Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability (Stored). The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Cross-site scripting (XSS) vulnerability in wp-includes/wp-db.php in WordPress before 4.2.1 allows remote attackers to inject arbitrary web script or HTML via a long comment that is improperly stored because of limitations on the MySQL TEXT data type.

The weakness was disclosed 04/26/2015 by Klikki Oy as WordPress 4.2 Stored XSS as confirmed advisory (Website). The advisory is shared for download at klikki.fi. This vulnerability was named CVE-2015-3440 since 04/28/2015. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 83138 (WordPress <= 3.9.5 / 4.1.x < 4.1.4 / 4.2.x < 4.2.1 Comments Stored XSS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115192 (Fedora Security Update for wordpress (FEDORA-2015-7725)).

Upgrading to version 3.7.8, 3.8.8, 3.9.6, 4.0.3, 4.1.4 or 4.2.1 eliminates this vulnerability. The upgrade is hosted for download at wordpress.org. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (36844), Tenable (83138), SecurityFocus (BID 74334†), OSVDB (121320†) and SecurityTracker (ID 1032199†). The entry VDB-76885 is pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Name: Stored
Class: Cross site scripting / Stored
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 83138
Nessus Name: WordPress <= 3.9.5 / 4.1.x < 4.1.4 / 4.2.x < 4.2.1 Comments Stored XSS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for wordpress FEDORA-2015-6808
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: WordPress 3.7.8/3.8.8/3.9.6/4.0.3/4.1.4/4.2.1

Timelineinfo

04/26/2015 🔍
04/26/2015 +0 days 🔍
04/27/2015 +1 days 🔍
04/27/2015 +0 days 🔍
04/27/2015 +0 days 🔍
04/28/2015 +1 days 🔍
04/29/2015 +1 days 🔍
08/03/2015 +96 days 🔍
02/05/2025 +3474 days 🔍

Sourcesinfo

Product: wordpress.com

Advisory: WordPress 4.2 Stored XSS
Researcher: Klikki Oy
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-3440 (🔍)
GCVE (CVE): GCVE-0-2015-3440
GCVE (VulDB): GCVE-100-75112

OVAL: 🔍

SecurityFocus: 74334 - WordPress Comment Section HTML Injection Vulnerability
OSVDB: 121320
SecurityTracker: 1032199

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 04/27/2015 16:48
Updated: 02/05/2025 16:56
Changes: 04/27/2015 16:48 (66), 03/30/2019 09:56 (23), 02/05/2025 16:56 (16)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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