CVE-2012-4185 in Firefox
Summary
by MITRE
buffer overflow in the nschartraits::length function in mozilla firefox before 16.0, firefox esr 10.x before 10.0.8, thunderbird before 16.0, thunderbird esr 10.x before 10.0.8, and seamonkey before 2.13 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2012-4185 represents a critical buffer overflow flaw within the nschartraits::length function of Mozilla Firefox and related applications. This issue affects multiple products including Firefox versions prior to 16.0, Firefox ESR 10.x versions prior to 10.0.8, Thunderbird versions prior to 16.0, Thunderbird ESR 10.x versions prior to 10.0.8, and SeaMonkey versions prior to 2.13. The flaw resides in the core character handling mechanisms of these applications, specifically within the nschartraits namespace which manages character string operations. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, though the actual memory corruption occurs in heap memory due to improper bounds checking in the string length calculation function. This type of vulnerability falls within the ATT&CK framework under T1059.007 for Command and Scripting Interpreter and T1203 for Exploitation for Client Execution, as it enables remote code execution through crafted input vectors that trigger the buffer overflow condition.
The technical implementation of this vulnerability occurs when the nschartraits::length function processes character strings without adequate validation of input boundaries. When maliciously crafted strings are processed by this function, the lack of proper bounds checking allows attackers to write beyond allocated memory buffers, leading to heap corruption. The overflow can be triggered through various attack vectors including malformed web pages, email content, or other data inputs that pass through the affected character handling routines. The nature of heap corruption means that attackers can potentially overwrite critical memory structures, function pointers, or return addresses, enabling arbitrary code execution. The vulnerability's remote exploitability stems from the fact that these applications process untrusted input from web pages or email messages, making the attack surface particularly broad. The flaw essentially allows an attacker to manipulate memory layout in a way that can be leveraged for privilege escalation or complete system compromise, depending on the execution context and target operating system.
The operational impact of CVE-2012-4185 extends beyond simple denial of service to represent a severe security risk for organizations relying on affected Mozilla applications. The vulnerability's exploitation capability means that remote attackers can potentially gain full control of user systems, making it particularly dangerous for enterprise environments where these browsers are widely deployed. The affected products include long-term support versions, meaning that organizations with extended support requirements were particularly vulnerable for extended periods. The heap corruption nature of the flaw makes detection difficult as the memory corruption might not immediately manifest as a crash, allowing attackers to execute code silently. Organizations using these vulnerable versions faced significant risk exposure, as the vulnerability could be exploited through standard web browsing activities or email processing without user interaction. The vulnerability's presence in both desktop browsers and email clients created a comprehensive attack surface that could be leveraged across multiple attack vectors.
Mitigation strategies for CVE-2012-4185 primarily focus on immediate application updates and patches to versions that address the buffer overflow condition. Organizations should prioritize upgrading all affected Mozilla products to their patched versions, particularly noting that Firefox 16.0, Firefox ESR 10.0.8, Thunderbird 16.0, Thunderbird ESR 10.0.8, and SeaMonkey 2.13 or later contain the necessary fixes. The patch implementation addresses the specific bounds checking issue within the nschartraits::length function by ensuring proper validation of character string lengths before processing. Additional defensive measures include implementing network-based security controls such as web application firewalls that can detect and block malicious input patterns, as well as deploying sandboxing mechanisms that limit the impact of successful exploitation attempts. System administrators should also consider implementing strict content filtering policies for email and web traffic, particularly focusing on reducing exposure to untrusted content sources. The vulnerability's classification as a heap-based buffer overflow makes it particularly susceptible to exploitation techniques such as return-oriented programming and data execution prevention bypasses, making comprehensive patch management essential for maintaining security posture. Organizations should also conduct thorough vulnerability assessments to identify any systems still running affected versions and implement immediate remediation plans to address the identified risk exposure.