CVE-2005-2701 in Firefox
Summary
by MITRE
Heap-based buffer overflow in Firefox before 1.0.7 and Mozilla Suite before 1.7.12 allows remote attackers to execute arbitrary code via an XBM image file that ends in a large number of spaces instead of the expected end tag.
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Analysis
by VulDB Data Team • 03/12/2021
The vulnerability identified as CVE-2005-2701 represents a critical heap-based buffer overflow affecting Mozilla Firefox versions prior to 1.0.7 and the Mozilla Suite versions before 1.7.12. This flaw resides in the handling of XBM image files, which are a bitmap image format used in X Window System environments. The vulnerability exploits a fundamental memory management issue where the application fails to properly validate the length of data when processing XBM file endings, creating an opportunity for malicious code execution.
The technical mechanism behind this vulnerability involves the improper parsing of XBM file structures, specifically when encountering image files that conclude with an excessive number of trailing spaces rather than the standard end tag sequence. This deviation from expected file formatting triggers a buffer overflow condition in the heap memory region where the application stores image data during processing. The flaw manifests when the application attempts to parse the XBM file header and encounters unexpected data length parameters, causing memory corruption that can be leveraged by remote attackers to inject and execute arbitrary code on vulnerable systems.
From an operational perspective, this vulnerability presents a significant risk to users of affected browsers since XBM files are commonly encountered in web environments and can be embedded within HTML documents or delivered through various web-based attack vectors. Attackers can craft malicious XBM files that, when processed by vulnerable browsers, will trigger the buffer overflow condition. The implications extend beyond simple code execution to potentially allow full system compromise, as the heap corruption can be manipulated to overwrite critical memory structures or redirect program execution flow. This vulnerability aligns with CWE-121, heap-based buffer overflow, and represents a classic example of how improper input validation can lead to remote code execution in web browsers.
The attack surface for this vulnerability is particularly concerning given the widespread use of affected browser versions during 2005, when the vulnerability was discovered. Users could be exploited simply by visiting web pages containing malicious XBM images or by downloading infected files, making this a prevalent threat in the browser security landscape. Organizations and individuals using these vulnerable versions faced potential compromise through social engineering attacks, drive-by downloads, or compromised websites that served malicious XBM content. The vulnerability demonstrates the importance of proper input validation and memory safety practices in web browser implementations.
Mitigation strategies for this vulnerability required immediate patching of affected browser versions to implement proper bounds checking and input validation for XBM file processing. The recommended remediation involved updating to Firefox 1.0.7 or Mozilla Suite 1.7.12, which included fixes addressing the buffer overflow condition. Security professionals should have implemented network-based protections such as web application firewalls to filter potentially malicious XBM content, while also educating users about avoiding untrusted web content. Additionally, browser security configurations should have been adjusted to disable automatic image loading for potentially dangerous formats, and regular security updates should have been enforced to prevent exploitation of similar vulnerabilities in the future. This vulnerability highlighted the critical need for robust memory safety practices in browser development and contributed to the evolution of more secure coding standards and automated vulnerability detection mechanisms.