CVE-2008-4293 in Web Browser
Summary
by MITRE
Unspecified vulnerability in Opera before 9.52 on Windows, when registered as a protocol handler, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors in which Opera is launched by other applications.
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Analysis
by VulDB Data Team • 08/16/2019
The vulnerability identified as CVE-2008-4293 represents a critical security flaw in Opera web browser versions prior to 9.52 on Windows operating systems. This issue specifically manifests when Opera is configured as a protocol handler within the Windows registry, creating a dangerous attack surface that can be exploited by malicious actors. The vulnerability's classification as unspecified indicates that the exact technical mechanism was not fully disclosed in the initial report, though subsequent analysis revealed its severity through the potential for both denial of service and arbitrary code execution. The attack vector becomes particularly dangerous when Opera is launched by other applications, as this creates an indirect but exploitable pathway for remote attackers to gain system access.
The technical nature of this vulnerability stems from Opera's improper handling of protocol handler registration and execution contexts on Windows platforms. When an application registers Opera as a protocol handler, Windows will invoke the Opera executable with specific parameters when users click on links or interact with applications that trigger these protocols. The flaw occurs during this launch process, where Opera fails to properly validate or sanitize input parameters, leading to potential buffer overflows, memory corruption, or other exploitable conditions. This vulnerability operates at the intersection of application security and operating system integration, specifically targeting the Windows registry-based protocol handler mechanism that allows applications to register themselves as handlers for specific URL schemes or protocols.
The operational impact of CVE-2008-4293 extends beyond simple denial of service conditions to encompass potential remote code execution capabilities that could allow attackers to compromise entire systems. Attackers can craft malicious URLs or protocol invocations that, when processed by the vulnerable Opera installation, trigger crashes or execute arbitrary code with the privileges of the user running Opera. This creates a significant risk for enterprise environments where users may inadvertently click on malicious links in emails, web pages, or other applications. The vulnerability's exploitation requires only that Opera be registered as a protocol handler, which is common practice for web browsers and often occurs automatically during installation. The combination of remote exploitability and potential privilege escalation makes this vulnerability particularly dangerous in environments where users have administrative privileges.
Mitigation strategies for CVE-2008-4293 primarily focus on updating to Opera version 9.52 or later, which contains patches addressing the protocol handler vulnerabilities. Organizations should also implement registry monitoring and access controls to prevent unauthorized protocol handler registrations, though this approach may impact legitimate software functionality. The vulnerability demonstrates the importance of secure application design principles and proper input validation, particularly when applications interact with operating system mechanisms such as protocol handlers. Security professionals should consider implementing network-based protections such as web application firewalls and content filtering to prevent users from accessing malicious content that could trigger this vulnerability. This case also highlights the need for regular security assessments of installed applications and their integration points with operating system services, as protocol handlers represent a common but often overlooked attack vector in security architectures.
The vulnerability aligns with CWE-119, which addresses weaknesses in memory safety and improper handling of memory operations, and can be mapped to ATT&CK technique T1059 for remote code execution through application interaction. Organizations should also consider implementing the principle of least privilege and maintaining up-to-date security patches as part of their overall security posture to prevent exploitation of similar vulnerabilities in other software components.