MyBB up to 1.8.25 Poll Vote Count sql injection

Summaryinfo

A vulnerability has been found in MyBB up to 1.8.25 and classified as critical. This issue affects some unknown processing of the component Poll Vote Count Handler. This manipulation causes sql injection. This vulnerability is tracked as CVE-2021-27946. The attack is possible to be carried out remotely. Moreover, an exploit is present. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in MyBB up to 1.8.25 (Content Management System). Affected by this vulnerability is an unknown part of the component Poll Vote Count Handler. The manipulation with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 03/16/2021. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-27946. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK. The company Spyse scanned the Internet and collected all possible domain names and their technologies. They just detected over 2k potentially vulnerable domains with MyBB installed.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

Upgrading to version 1.8.26 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (49699). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Content Management System

Name

• MyBB

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
• 1.8.8
• 1.8.9
• 1.8.10
• 1.8.11
• 1.8.12
• 1.8.13
• 1.8.14
• 1.8.15
• 1.8.16
• 1.8.17
• 1.8.18
• 1.8.19
• 1.8.20
• 1.8.21
• 1.8.22
• 1.8.23
• 1.8.24
• 1.8.25

License

• open-source

Website

• Product: https://mybb.com/

CPE 2.3info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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