CVE-2008-3078 in Web Browser
Summary
by MITRE
Opera before 9.51 does not properly manage memory within functions supporting the CANVAS element, which allows remote attackers to read uninitialized memory contents by using JavaScript to read a canvas image.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability described in CVE-2008-3078 represents a critical memory management flaw in Opera web browsers prior to version 9.51, specifically affecting the handling of canvas elements within the browser's JavaScript execution environment. This issue stems from inadequate initialization of memory regions when processing canvas image data, creating a pathway for malicious actors to extract sensitive information from the browser's memory space. The vulnerability exists within the browser's rendering engine where canvas elements are processed, particularly when JavaScript code attempts to read image data from canvas objects that have not been properly initialized.
The technical flaw manifests when JavaScript code interacts with canvas elements that contain uninitialized memory segments, allowing attackers to perform memory reads that should otherwise be restricted or properly initialized. This memory disclosure vulnerability occurs because the browser fails to properly manage the memory allocation and initialization process for canvas image data structures, leaving portions of memory accessible to JavaScript execution contexts. The vulnerability is particularly concerning because it enables attackers to read uninitialized memory contents, which may contain sensitive data such as passwords, session tokens, or other confidential information that was previously stored in the memory locations.
Operationally, this vulnerability poses significant risks to user security and privacy, as remote attackers can leverage this flaw to extract potentially sensitive information from the victim's browser memory. The attack vector requires only a malicious website that loads JavaScript code capable of interacting with canvas elements, making it particularly dangerous as users can be compromised simply by visiting a compromised website. The memory disclosure can potentially expose session cookies, authentication tokens, or other sensitive data that was previously stored in memory, effectively undermining the browser's security model and user privacy protections. This vulnerability directly impacts the browser's ability to maintain secure memory boundaries between different execution contexts.
The vulnerability aligns with CWE-125, which describes "Out-of-bounds Read" conditions where programs access memory locations beyond their intended boundaries, and can be categorized under ATT&CK technique T1059.007 for JavaScript execution. Organizations should immediately update to Opera version 9.51 or later to mitigate this vulnerability, as the fix addresses the improper memory management within canvas element processing. Additionally, browser vendors should implement comprehensive memory initialization checks for all graphical element processing components, particularly those that handle user-generated content. Users should be advised to avoid visiting untrusted websites and to maintain current browser versions to prevent exploitation of this memory disclosure vulnerability that could lead to session hijacking or credential theft attacks.