CVE-2015-0873 in Perltreebbs
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Homepage Decorator PerlTreeBBS 2.30 and earlier allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 04/11/2018
The CVE-2015-0873 vulnerability represents a critical cross-site scripting flaw in Homepage Decorator PerlTreeBBS version 2.30 and earlier systems. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws. The vulnerability allows remote attackers to inject malicious web scripts or HTML content into the application, potentially compromising user sessions and data integrity. The unspecified vectors indicate that the attack surface encompasses multiple potential entry points within the application's input handling mechanisms, making the vulnerability particularly concerning for security professionals who must account for all possible attack vectors.
The technical implementation of this XSS vulnerability stems from inadequate input validation and output encoding within the PerlTreeBBS application framework. When users interact with the homepage decorator functionality, the application fails to properly sanitize user-supplied data before rendering it in web pages. This omission creates opportunities for attackers to embed malicious scripts that execute in the context of other users' browsers. The vulnerability's impact extends beyond simple script injection, as it can facilitate session hijacking, credential theft, and the redirection of users to malicious websites. The attack requires no special privileges or authentication, making it particularly dangerous as it can be exploited by anyone with access to the vulnerable application.
From an operational perspective, this vulnerability poses significant risks to organizations relying on PerlTreeBBS for their web presence. The potential for widespread impact exists due to the nature of XSS attacks, which can compromise multiple users simultaneously. Attackers can exploit this vulnerability to steal session cookies, redirect users to phishing sites, or inject malicious content that appears legitimate to end users. The vulnerability's presence in the homepage decorator component suggests that even seemingly benign user interface elements can serve as attack vectors. Organizations may experience reputational damage, regulatory penalties, and financial losses due to successful exploitation of this vulnerability, particularly in environments where user trust and data security are paramount.
Effective mitigation strategies for CVE-2015-0873 require comprehensive input validation and output encoding implementations. Organizations should immediately upgrade to PerlTreeBBS versions that address this vulnerability, as no patches are available for the affected versions. The remediation approach must include implementing proper HTML escaping for all user-supplied content and establishing robust input validation mechanisms that filter out potentially malicious content. Security teams should conduct thorough penetration testing to identify all potential injection points within the application and implement Content Security Policy headers to provide additional protection layers. Additionally, regular security assessments and code reviews should be conducted to prevent similar vulnerabilities from emerging in future application developments, aligning with the ATT&CK framework's mitigation recommendations for web application security.