MyBB/MyBB Merge System up to 1.8.7 input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	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.
9.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in MyBB and MyBB Merge System up to 1.8.7 and classified as critical. Impacted is an unknown function. The manipulation leads to input validation. This vulnerability is referenced as CVE-2016-9420. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in MyBB and MyBB Merge System up to 1.8.7 (Content Management System). This issue affects an unknown part. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

MyBB (aka MyBulletinBoard) before 1.8.8 and MyBB Merge System before 1.8.8 allow remote attackers to have unspecified impact via vectors related to "loose comparison false positives."

The bug was discovered 01/31/2017. The weakness was published 01/31/2017 (Website). The advisory is shared at openwall.com. The identification of this vulnerability is CVE-2016-9420 since 11/17/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/08/2020).

Upgrading to version 1.8.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 94396†). Similar entries are available at VDB-96323, VDB-96324, VDB-96325 and VDB-96326. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Content Management System

Name

• MyBB
• MyBB Merge System

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7

License

• open-source

Website

• Product: https://mybb.com/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.6

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MyBB/MyBB Merge System 1.8.8

Timelineinfo

11/10/2016 🔍
11/17/2016 +7 days 🔍
01/31/2017 +75 days 🔍
01/31/2017 +0 days 🔍
01/31/2017 +0 days 🔍
02/01/2017 +1 days 🔍
08/08/2020 +1284 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: openwall.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9420 (🔍)
GCVE (CVE): GCVE-0-2016-9420
GCVE (VulDB): GCVE-100-96365
SecurityFocus: 94396 - MyBB Versions Prior To 1.8.8 Multiple Security Vulnerabilities
OSVDB: - CVE-2016-9420 - MyBB - Multiple Products - Unspecified Issue

See also: 🔍

Entryinfo

Created: 02/01/2017 07:17
Updated: 08/08/2020 18:21
Changes: 02/01/2017 07:17 (59), 08/08/2020 18:21 (6)
Complete: 🔍
Cache ID: 216::103

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