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.
CVSS Severity (version 2.0):
Impact Subscore: 10.0
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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US-CERT Vulnerability Note:
20080916 InstallShield Update Agent - Downloads and executes "Rule Scripts" insecurely.
Vulnerable software and versions