CVE-2009-3658 in Sb.superbuddy.1 Active X Control
Summary
by MITRE
Use-after-free vulnerability in the Sb.SuperBuddy.1 ActiveX control (sb.dll) in America Online (AOL) 9.5.0.1 allows remote attackers to trigger memory corruption or possibly execute arbitrary code via a malformed argument to the SetSuperBuddy method.
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Analysis
by VulDB Data Team • 11/02/2025
The CVE-2009-3658 vulnerability represents a critical use-after-free flaw within the Sb.SuperBuddy.1 ActiveX control component of America Online version 9.5.0.1. This vulnerability resides in the sb.dll dynamic link library that implements the SuperBuddy functionality within the AOL client application. The issue manifests when the SetSuperBuddy method processes malformed input arguments, creating a scenario where memory previously allocated to an object is accessed after the object has been freed, leading to unpredictable behavior and potential exploitation. This type of vulnerability falls under the CWE-416 category of Use After Free, which is classified as a serious memory corruption vulnerability that can lead to arbitrary code execution.
The technical exploitation of this vulnerability occurs when a remote attacker crafts a malicious argument to the SetSuperBuddy method that triggers the use-after-free condition. When the ActiveX control processes this malformed input, it can cause the application to access memory that has already been deallocated, potentially leading to heap corruption. Attackers can leverage this memory corruption to overwrite critical memory locations, manipulate program execution flow, or inject malicious code into the target system. The vulnerability is particularly dangerous because it allows remote code execution without requiring local system access, making it an attractive target for attackers seeking to compromise AOL users' systems.
The operational impact of this vulnerability extends beyond individual system compromise to affect the broader AOL user base that relies on the SuperBuddy feature for social networking and communication functions. Since the vulnerability exists within an ActiveX control that is automatically loaded by the AOL client application, any user browsing web content that triggers the vulnerable method could be exploited. This creates a significant attack surface for remote attackers who can deliver malicious content through various vectors including compromised websites, email attachments, or malicious web applications that interact with the vulnerable ActiveX control. The vulnerability demonstrates a classic browser-based attack pattern that aligns with ATT&CK technique T1203 for Exploitation for Client Execution.
Security mitigations for this vulnerability should include immediate patching of the affected AOL client application to address the memory management issue within the Sb.SuperBuddy.1 ActiveX control. System administrators should disable or remove the vulnerable ActiveX control from user systems where possible, particularly in environments where users may encounter untrusted web content. Browser security configurations should be adjusted to restrict ActiveX control loading and execution, implementing security policies that prevent automatic execution of potentially dangerous ActiveX components. Additionally, network-based protections such as web application firewalls and content filtering solutions can help detect and block malicious payloads attempting to exploit this vulnerability. Organizations should also consider implementing runtime protection mechanisms and memory corruption detection tools to identify potential exploitation attempts. The vulnerability highlights the importance of proper input validation and memory management practices in ActiveX controls, emphasizing the need for regular security assessments of legacy components that continue to support enterprise applications.