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CVE-2024-23336— Incomplete disallowed remote addresses list in MyBB

Quick assessment

Affected
mybb mybb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MyBB（MyBulletinBoard）是MYBB团队的开发的一套用PHP和MySQL开发的免费且基于Web的论坛软件。该软件具有简单易用、支持多国语言、可扩展等特点。 MyBB 1.8.38之前版本存在安全漏洞，该漏洞源于存在服务器请求伪造（SSRF）漏洞。

CVSS 5.0 · Medium EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-23336

Vulnerability Information
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Vulnerability Title
Incomplete disallowed remote addresses list in MyBB
Source: CVE Program / CVE List V5
Vulnerability Description
MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
MyBB 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MyBB（MyBulletinBoard）是MYBB团队的开发的一套用PHP和MySQL开发的免费且基于Web的论坛软件。该软件具有简单易用、支持多国语言、可扩展等特点。 MyBB 1.8.38之前版本存在安全漏洞，该漏洞源于存在服务器请求伪造（SSRF）漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mybb mybb < 1.8.38 -

II. Public POCs for CVE-2024-23336

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III. Intelligence Information for CVE-2024-23336

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Patches & Fixes for CVE-2024-23336 (1)

Vendor Advisories for CVE-2024-23336 (1)

Other References for CVE-2024-23336 (2)

IV. Related Vulnerabilities

Same product: mybb
Same vendor: mybb
Same weakness: CWE-918

V. Comments for CVE-2024-23336

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