CVE-2015-6966 in Nibbleblog
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in Nibbleblog before 4.0.5 allow remote attackers to hijack the authentication of administrators for requests that (1) create a post via a new_simple action to admin.php or (2) conduct cross-site scripting (XSS) attacks via the content parameter in a new_simple action to admin.php.
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Analysis
by VulDB Data Team • 12/21/2017
The CVE-2015-6966 vulnerability represents a critical cross-site request forgery flaw affecting Nibbleblog versions prior to 4.0.5. This vulnerability stems from inadequate validation of HTTP requests within the administrative interface, creating a significant security risk for content management systems that rely on user authentication. The flaw specifically targets the admin.php endpoint which handles various administrative functions including post creation and content management operations.
The technical implementation of this CSRF vulnerability exploits the absence of proper anti-CSRF tokens or validation mechanisms in the new_simple action handler. Attackers can craft malicious requests that appear to originate from authenticated administrators, leveraging the trust relationship between the web application and legitimate users. The vulnerability manifests when administrators visit compromised websites or click on malicious links that trigger unauthorized actions against the vulnerable Nibbleblog instance. This flaw operates under the CWE-352 category, which specifically addresses Cross-Site Request Forgery vulnerabilities where applications fail to validate the source of requests.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to perform administrative actions without proper authorization. When an administrator visits a malicious site, the CSRF attack can automatically create posts with arbitrary content, potentially leading to defacement or malicious content distribution. Additionally, the vulnerability allows for cross-site scripting attacks through the content parameter, creating a compound threat where attackers can inject malicious scripts that execute in the context of the administrator's browser. This dual nature of the vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as it enables arbitrary code execution through crafted content parameters.
The exploitation of this vulnerability requires minimal user interaction, as it relies on the administrator's active session being compromised through social engineering or by visiting malicious websites. Attackers can leverage this flaw to gain persistent access to the administrative interface, potentially leading to complete system compromise. The vulnerability's presence in the admin.php endpoint indicates a fundamental flaw in the application's security architecture, particularly in how it validates and authenticates administrative actions. This represents a significant concern for organizations relying on Nibbleblog for content management, as it undermines the integrity of their administrative processes and potentially exposes sensitive data or system resources to unauthorized access. The vulnerability demonstrates the critical importance of implementing proper CSRF protection mechanisms, including anti-CSRF tokens, origin validation, and strict request verification processes that are essential components of secure web application development practices.