MyBB up to 1.8.35 Template code injection

Summaryinfo

A vulnerability was found in MyBB up to 1.8.35. It has been rated as critical. This affects an unknown part of the component Template Handler. This manipulation causes code injection. This vulnerability appears as CVE-2023-41362. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in MyBB up to 1.8.35 (Content Management System). It has been declared as critical. Affected by this vulnerability is an unknown function of the component Template Handler. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

MyBB before 1.8.36 allows Code Injection by users with certain high privileges. Templates in Admin CP intentionally use eval, and there was some validation of the input to eval, but type juggling interfered with this when using PCRE within PHP.

The weakness was presented 08/29/2023 as GHSA-pr74-wvp3-q6f5. The advisory is shared at github.com. This vulnerability is known as CVE-2023-41362 since 08/29/2023. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

Upgrading to version 1.8.36 eliminates this vulnerability. Applying the patch a43a6f22944e769a6eabc58c39e7bc18c1cab4ca is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best 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
• 1.8.26
• 1.8.27
• 1.8.28
• 1.8.29
• 1.8.30
• 1.8.31
• 1.8.32
• 1.8.33
• 1.8.34
• 1.8.35

License

• open-source

Website

• Product: https://mybb.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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