CVE-2011-2620 in Web Browser
Summary
by MITRE
Unspecified vulnerability in Opera before 11.50 allows remote attackers to cause a denial of service (application crash) via vectors involving SVG animation.
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Analysis
by VulDB Data Team • 11/13/2021
The vulnerability identified as CVE-2011-2620 represents a critical denial of service flaw affecting Opera web browsers prior to version 11.50. This issue specifically manifests when the browser processes SVG (Scalable Vector Graphics) animation elements, creating a condition where remote attackers can trigger application instability leading to complete crash scenarios. The unspecified nature of the vulnerability details suggests that the underlying technical mechanism may involve memory corruption, improper input validation, or buffer overflow conditions within the SVG rendering engine that handles animation sequences. Such vulnerabilities are particularly dangerous in web environments where users may unknowingly encounter malicious content during routine browsing activities.
The technical exploitation of this vulnerability occurs through carefully crafted SVG animation code that leverages weaknesses in Opera's processing of vector graphics elements. When the browser encounters malformed or malicious SVG animation sequences, the rendering engine fails to properly handle the animation parameters, resulting in memory corruption or execution flow disruption. This type of vulnerability falls under the CWE-125 weakness category, which encompasses out-of-bounds read conditions that can lead to application crashes and potential privilege escalation. The attack vector operates entirely through web content delivery, making it accessible to attackers who can host malicious SVG files on compromised websites or deliver them through social engineering techniques.
Operational impact of CVE-2011-2620 extends beyond simple application instability, as it creates a persistent threat to user productivity and system availability. Users operating affected Opera versions face the risk of unexpected browser termination during normal browsing sessions, potentially resulting in loss of unsaved work or session data. The vulnerability particularly affects environments where Opera is the primary browser, as attackers can craft targeted payloads that exploit this weakness to disrupt user activities. Organizations may experience increased support requests and decreased user satisfaction when affected systems encounter these crashes. The vulnerability also represents a potential stepping stone for more sophisticated attacks, as the browser crash conditions could be used to mask other malicious activities or create opportunities for privilege escalation through system instability.
Mitigation strategies for CVE-2011-2620 primarily focus on immediate browser updates to version 11.50 or later, which contain the necessary patches to address the SVG animation processing flaws. System administrators should implement comprehensive patch management protocols to ensure all Opera installations are updated promptly, particularly in enterprise environments where multiple users may be exposed to the vulnerability. Network-level defenses such as web application firewalls and content filtering systems can provide additional protection by blocking suspicious SVG content, though this approach may impact legitimate functionality. Users should be educated about the risks of visiting untrusted websites and downloading unknown files that may contain malicious SVG content. The vulnerability demonstrates the importance of maintaining current browser versions and implementing layered security approaches, as the flaw represents a classic example of how browser rendering engines can become attack surfaces when processing complex multimedia content. Security professionals should monitor for similar vulnerabilities in other browser vendors and ensure that defensive measures include both preventive updates and reactive monitoring capabilities.