CVE-2024-37656 Scanner

GnuBoard5 is a popular open-source bulletin board software used widely for creating online communities and discussion forums. Developed by the Korean company Sir Co., Ltd, it is favored for its versatility and user-friendly interface. GnuBoard5 is commonly used by organizations, educational institutions, and individuals worldwide to facilitate communication and manage forums and community interactions. Its extensive customization options allow users to tailor the software to meet specific needs, making it a preferred choice for many. The platform's active development and community support ensure it remains up to date with modern web standards.

The Open Redirect vulnerability in GnuBoard5 arises due to insufficient verification of URL parameters in the bbs/logout.php script. This vulnerability allows attackers to craft a malicious URL, redirecting unsuspecting users to arbitrary websites. Such redirections can lead to phishing attacks or unauthorized data collection as users may unknowingly provide sensitive information to malicious sites. This issue is of particular concern as it does not require authentication, making it easily exploitable by remote attackers.

Technical details reveal that the vulnerability resides in the parameter processing of the bbs/logout.php script. When the URL parameter is manipulated, it is possible to redirect users without their consent to an external site. The use of regex in the HTTP header matching process helps identify and confirm this vulnerability. Successful exploitation requires minimal effort as the attack can be carried out by anyone aware of the vulnerable endpoint, making it a potent threat if unaddressed.

If exploited, this vulnerability can lead to significant security risks, including the distribution of malware, phishing attacks, and the potential for users' sensitive information to be captured. Organizations using GnuBoard5 may suffer reputational damage and financial loss if their users fall victim to malicious redirects. The risk is compounded by the fact that such vulnerabilities can be automated, increasing the potential scale of the attack.

REFERENCES

• https://github.com/gnuboard/gnuboard5/issues/318
• https://nvd.nist.gov/vuln/detail/CVE-2024-37656