CVE-2012-6582 in Spambot
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Spambot module 6.x-3.x before 6.x-3.2 and 7.x-1.x before 7.x-1.1 for Drupal allows certain remote attackers to inject arbitrary web script or HTML via a stopforumspam.com API response, which is logged by the watchdog.
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Analysis
by VulDB Data Team • 03/17/2019
The CVE-2012-6582 vulnerability represents a critical cross-site scripting flaw within the Spambot module for Drupal platforms, affecting versions 6.x-3.x prior to 6.x-3.2 and 7.x-1.x prior to 7.x-1.1. This vulnerability stems from inadequate input validation and sanitization of data received from external sources, specifically the stopforumspam.com API service. The flaw manifests when the module processes API responses containing malicious script content, which then gets logged through Drupal's watchdog system, creating a persistent vector for XSS attacks. The vulnerability operates at the application layer and can be exploited by remote attackers without requiring authentication, making it particularly dangerous in web environments where user interactions are common.
The technical implementation of this vulnerability involves the module's failure to properly sanitize or escape data retrieved from the stopforumspam.com API before storing it in the watchdog logging system. When the API returns malicious content, typically in the form of user agent strings or other metadata fields that might contain script tags, the Spambot module does not adequately filter or encode this data before it is processed by the watchdog module. This creates a scenario where malicious scripts embedded within API responses can be executed in the context of any user who views the watchdog log entries, effectively enabling attackers to inject arbitrary web script or HTML code into the victim's browser session. The vulnerability is classified under CWE-79 as a classic cross-site scripting weakness, specifically manifesting as stored XSS since the malicious content persists in the log entries.
The operational impact of CVE-2012-6582 extends beyond simple script injection, as it provides attackers with a potential foothold for more sophisticated attacks within Drupal environments. When malicious scripts execute in users' browsers, they can perform actions such as stealing session cookies, redirecting users to malicious sites, defacing web pages, or even executing additional payloads that could compromise the entire web application. The watchdog logging system becomes a persistent storage mechanism for these malicious scripts, meaning that any user with access to the watchdog log entries could become a victim of the XSS attack. This vulnerability particularly affects Drupal sites that rely on the Spambot module for spam protection, where the API responses are frequently processed and logged, creating a continuous risk window for exploitation.
Organizations affected by this vulnerability should immediately implement the security patches released by the Drupal security team for both the 6.x-3.2 and 7.x-1.1 versions of the Spambot module. The recommended mitigation strategy involves updating to the patched versions that include proper input sanitization and output encoding mechanisms for API responses. Additionally, administrators should consider implementing Content Security Policy headers to provide an additional layer of protection against XSS attacks, and should regularly audit their watchdog logs for suspicious entries that might indicate exploitation attempts. The vulnerability also highlights the importance of validating and sanitizing all external API responses before processing them within web applications, aligning with ATT&CK technique T1211 for credential access through exploitation of web application vulnerabilities. Organizations should also consider implementing web application firewalls and monitoring systems that can detect and block malicious API responses before they are processed by vulnerable modules.