CVE-2012-2634 in FeedDemon
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in FeedDemon before 4.0, when the feed preview option is enabled, allows remote attackers to inject arbitrary web script or HTML via a feed.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 02/17/2019
The CVE-2012-2634 vulnerability represents a critical cross-site scripting flaw discovered in FeedDemon version 3.9 and earlier, where the feed preview functionality creates an exploitable vector for remote attackers. This vulnerability specifically affects users who have enabled the feed preview option within the application, making it a targeted security risk for those utilizing this particular feature. The flaw stems from insufficient input validation and output encoding mechanisms within the feed processing component, allowing malicious actors to inject harmful script code into feed content that gets rendered in the user's browser.
The technical implementation of this vulnerability resides in the application's handling of feed data when preview mode is active. When FeedDemon processes RSS or Atom feeds, it fails to properly sanitize or escape user-supplied content before rendering it in the preview window. This creates an environment where attackers can craft malicious feeds containing embedded javascript or html code that executes in the context of the user's browser session. The vulnerability is classified as a classic reflected XSS attack vector, where the malicious payload is delivered through the feed content itself rather than being stored on the server. This type of vulnerability falls under CWE-79, which specifically addresses cross-site scripting flaws in web applications and desktop software that render untrusted content.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive user data, redirect users to malicious websites, or even execute arbitrary commands on the victim's system. Since FeedDemon is a desktop application that processes feeds from potentially untrusted sources, users who regularly access feeds from unknown or compromised sources become prime targets for exploitation. The vulnerability is particularly dangerous because it requires no user interaction beyond enabling the feed preview feature, meaning that simply having this option activated creates a security risk. Attackers can craft malicious feeds that contain javascript payloads designed to steal cookies, capture keystrokes, or redirect users to phishing sites, making this a significant threat to user privacy and system security.
Mitigation strategies for CVE-2012-2634 primarily involve upgrading to FeedDemon version 4.0 or later, which includes proper input sanitization and output encoding mechanisms. Organizations should also implement network-level controls such as feed filtering and content validation to prevent malicious feeds from reaching user systems. Additionally, security awareness training for users who regularly access external feeds can help reduce the risk of exploitation. The vulnerability demonstrates the importance of input validation in desktop applications that process external content, aligning with ATT&CK technique T1203 which covers exploitation of vulnerabilities in software components. System administrators should also consider implementing application whitelisting policies that restrict the execution of potentially vulnerable applications until proper patches are applied, as recommended in industry best practices for vulnerability management and incident response procedures.