CVE-2008-1093 in Intallshield Update Agent
Summary
by MITRE
Acresso InstallShield Update Agent does not properly verify the authenticity of Rule Scripts obtained from GetRules.asp web pages on FLEXnet Connect servers, which allows remote man-in-the-middle attackers to execute arbitrary VBScript code via Trojan horse Rules.
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Analysis
by VulDB Data Team • 12/30/2024
The vulnerability identified as CVE-2008-1093 resides within Acresso InstallShield Update Agent software, a component commonly used for software distribution and update management in enterprise environments. This flaw represents a critical security weakness that undermines the integrity of the software update process by failing to validate the authenticity of Rule Scripts retrieved from FLEXnet Connect servers. The vulnerability specifically affects the verification mechanisms implemented by the InstallShield Update Agent when communicating with web services hosted on FLEXnet Connect infrastructure, creating a pathway for malicious actors to compromise systems through unauthorized code execution.
The technical exploitation of this vulnerability occurs through a man-in-the-middle attack vector where attackers intercept communication between the InstallShield Update Agent and the GetRules.asp web pages hosted on FLEXnet Connect servers. The agent's failure to properly authenticate the Rule Scripts means that any attacker capable of positioning themselves between the client and server can substitute legitimate update scripts with malicious Trojan horse Rules written in VBScript. This authentication bypass allows the attacker to execute arbitrary code on the target system with the privileges of the user running the InstallShield Update Agent, typically resulting in elevated system access and potential lateral movement within the network. The vulnerability is categorized under CWE-295 as "Improper Certificate Validation" and aligns with ATT&CK technique T1059.005 for "Command and Scripting Interpreter: Visual Basic", demonstrating how insecure update mechanisms can be leveraged for code execution.
The operational impact of this vulnerability extends beyond individual system compromise to potentially affect entire enterprise networks relying on InstallShield Update Agent for software management. Organizations using this update mechanism may experience unauthorized code execution on multiple endpoints simultaneously, especially in environments where the update agent runs with elevated privileges or where automatic updates are enabled. The vulnerability's exploitation can lead to persistent backdoors, data exfiltration, system corruption, and complete compromise of the affected systems. Given that the attack requires only network interception capabilities, it represents a particularly dangerous threat as it can be exploited by attackers with minimal technical expertise and network access. The vulnerability demonstrates a fundamental flaw in the trust model of software update systems, where the integrity of update content is not properly verified before execution, creating a persistent security risk that can be exploited across multiple systems within a network.
Mitigation strategies for CVE-2008-1093 should focus on implementing proper certificate validation and secure communication protocols between the InstallShield Update Agent and FLEXnet Connect servers. Organizations should disable automatic updates for affected systems until proper security patches are implemented, and implement network monitoring to detect unusual communication patterns with FLEXnet servers. The use of secure communication channels with proper SSL/TLS certificate validation should be enforced, and network segmentation should be implemented to limit the potential impact of successful exploitation. Additionally, security awareness training should emphasize the importance of verifying software update sources and maintaining updated security configurations. The vulnerability highlights the critical need for robust update integrity mechanisms and proper certificate validation in enterprise software distribution systems, aligning with security best practices outlined in NIST SP 800-53 and ISO 27001 frameworks for secure software deployment and update management.