CVE-2013-0781 in Firefox
Summary
by MITRE
Use-after-free vulnerability in the nsPrintEngine::CommonPrint function in Mozilla Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
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Analysis
by VulDB Data Team • 05/05/2021
The CVE-2013-0781 vulnerability represents a critical use-after-free condition that existed in the printing subsystem of Mozilla Firefox and related applications. This flaw was particularly dangerous because it occurred within the nsPrintEngine::CommonPrint function, which handles the core printing operations for these browsers. The vulnerability allowed remote attackers to exploit heap memory corruption through unspecified attack vectors, potentially leading to arbitrary code execution or system instability. The affected versions included Firefox before 19.0, Thunderbird before 17.0.3, and SeaMonkey before 2.16, indicating this was a widespread issue across the Mozilla ecosystem.
The technical nature of this vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions where memory is accessed after it has been freed. In the context of browser security, this type of flaw occurs when the application continues to reference memory locations that have already been deallocated, creating opportunities for attackers to manipulate the heap memory structure. The nsPrintEngine::CommonPrint function was particularly susceptible because it managed complex memory operations during print processing, where multiple objects were created, used, and potentially freed during the execution flow. When the application failed to properly manage object lifecycles during print operations, it created opportunities for attackers to corrupt heap memory.
The operational impact of this vulnerability was significant, as it could be exploited remotely without requiring any user interaction beyond visiting a malicious website or opening a specially crafted email message. Attackers could potentially leverage this flaw to execute arbitrary code with the privileges of the affected application, which typically ran with the same permissions as the user. The heap corruption could lead to unpredictable behavior including application crashes, denial of service conditions, or more severe exploitation outcomes. This vulnerability particularly affected users who regularly accessed the internet or processed email messages, as the attack vectors could be delivered through standard web browsing or email interactions.
Mitigation strategies for CVE-2013-0781 primarily focused on immediate patching of affected software versions. Users were strongly advised to upgrade to Firefox 19.0, Thunderbird 17.0.3, or SeaMonkey 2.16, which contained the necessary fixes to prevent the use-after-free condition. Additionally, security researchers recommended implementing network-level protections such as web application firewalls and content filtering systems to block malicious content that might trigger this vulnerability. The fix typically involved proper memory management techniques including ensuring that object references were properly invalidated after memory deallocation and implementing additional safety checks during the print processing function. Organizations were also advised to conduct vulnerability assessments to identify any systems running affected versions and prioritize remediation efforts accordingly. This vulnerability highlighted the importance of thorough memory management in complex software systems and demonstrated how seemingly isolated components could create significant security risks when not properly protected against common exploitation patterns.