Mezzanine CMS 4.2.0 File Upload Persistent cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Mezzanine CMS 4.2.0. This impacts an unknown function of the component File Upload. The manipulation results in cross site scripting (Persistent). The attack can be executed remotely. Additionally, an exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mezzanine CMS 4.2.0 (Content Management System). It has been classified as problematic. Affected is an unknown functionality of the component File Upload. The manipulation with an unknown input leads to a cross site scripting vulnerability (Persistent). CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity.

The weakness was released 11/17/2016 by Tim Coen with Curesec Research Team as Mezzanine 4.2.0: XSS as confirmed mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. The public release was coordinated with the vendor. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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. The advisory points out:

When uploading files via the media manager, the extension .html is allowed, leading to XSS via file upload. An account with the permissions to upload files to the media manager is required.

A public exploit has been developed by Tim Coen and been published immediately after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 133 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.2.1 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

Entry connected to this vulnerability is available at VDB-93695. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Name: Persistent
Class: Cross site scripting / Persistent
CWE: CWE-80 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tim Coen
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: CMS 4.2.1

Timelineinfo

05/09/2016 🔍
05/09/2016 +0 days 🔍
09/19/2016 +133 days 🔍
11/17/2016 +59 days 🔍
11/17/2016 +0 days 🔍
11/19/2016 +2 days 🔍
07/24/2019 +977 days 🔍

Sourcesinfo

Advisory: Mezzanine 4.2.0: XSS
Researcher: Tim Coen
Organization: Curesec Research Team
Status: Confirmed
Coordinated: 🔍

GCVE (VulDB): GCVE-100-93696
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 11/19/2016 18:03
Updated: 07/24/2019 21:39
Changes: 11/19/2016 18:03 (56), 07/24/2019 21:39 (2)
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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