SB2019060619 - Multiple vulnerabilities in MyBB

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2019-3578)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the resetpassword function. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Information disclosure (CVE-ID: CVE-2019-3579)

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

MyBB 1.8.19 allows remote attackers to obtain sensitive information because it discloses the username upon receiving a password-reset request that lacks the code parameter.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://blog.mybb.com/
• https://blog.mybb.com/2019/02/27/mybb-1-8-20-released-security-maintenance-release/