CVE-2008-3433 in Download Accelerator Plus
Summary
by MITRE
SpeedBit Download Accelerator Plus (DAP) before 8.6.3.9 does not properly verify the authenticity of updates, which allows man-in-the-middle attackers to execute arbitrary code via a Trojan horse update, as demonstrated by evilgrade and DNS cache poisoning.
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Analysis
by VulDB Data Team • 11/22/2017
SpeedBit Download Accelerator Plus version 8.6.3.9 and earlier contained a critical vulnerability in its update mechanism that fundamentally compromised the software's security posture. The vulnerability stemmed from insufficient cryptographic verification of update files, creating a pathway for attackers to inject malicious code into the legitimate update process. This weakness allowed adversaries to perform man-in-the-middle attacks by intercepting update traffic and replacing legitimate update files with malicious payloads. The vulnerability specifically targeted the software's inability to validate digital signatures or checksums of downloaded update components, enabling attackers to exploit this gap through techniques such as DNS cache poisoning or evilgrade attacks that manipulate update servers.
The technical flaw represented a classic software supply chain attack vector, where the legitimate update infrastructure became the attack surface for code execution. This vulnerability directly maps to CWE-311, which describes the absence of proper cryptographic protection of sensitive data, and CWE-502, which covers deserialization of untrusted data. The attack methodology involved intercepting update requests and serving modified update files that would be automatically installed without user verification, effectively bypassing the software's intended security controls. The exploitability was significantly enhanced by the fact that users typically trust the update process, making the attack more successful than traditional methods that require user interaction.
The operational impact of this vulnerability was severe and far-reaching, as it allowed attackers to execute arbitrary code on vulnerable systems with the privileges of the user running the Download Accelerator Plus application. This created a persistent backdoor that could be used for data exfiltration, system reconnaissance, or further lateral movement within the network. The vulnerability affected organizations and individual users alike, as the malicious updates could be delivered through various attack vectors including compromised DNS servers, hijacked update servers, or network-based interception tools. The attack's stealth nature made detection particularly challenging since the malicious code was delivered through what appeared to be legitimate software updates.
Mitigation strategies for this vulnerability required immediate patching to version 8.6.3.9 or later, which implemented proper update authentication mechanisms. Organizations should have implemented network monitoring to detect unusual update traffic patterns and deployed intrusion detection systems to identify potential DNS cache poisoning attempts. The remediation process involved verifying the integrity of update files through cryptographic signatures and implementing certificate pinning to prevent the use of fraudulent update servers. Additionally, network administrators should have configured DNS security measures and deployed update server authentication protocols to prevent man-in-the-middle attacks. This vulnerability highlighted the critical importance of secure update mechanisms in software distribution and served as a prime example of why software vendors must implement robust cryptographic verification processes to protect against supply chain attacks. The incident demonstrated the necessity of following security best practices outlined in the OWASP Top Ten and aligned with ATT&CK framework techniques related to supply chain compromises and credential access through update mechanisms.