CVE-2011-0926 in Secure Desktop
Summary
by MITRE
A certain ActiveX control in CSDWebInstaller.ocx in Cisco Secure Desktop (CSD) does not properly verify the signature of an unspecified downloaded program, which allows remote attackers to execute arbitrary code by spoofing the CSD installation process, a different vulnerability than CVE-2010-0589.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability identified as CVE-2011-0926 affects Cisco Secure Desktop (CSD) version 3.1 and earlier, specifically targeting the CSDWebInstaller.ocx ActiveX control component. This issue represents a critical security flaw in the software's code signing verification mechanism that enables malicious actors to bypass legitimate authentication processes during the installation of Cisco Secure Desktop. The vulnerability stems from the ActiveX control's failure to properly validate digital signatures of downloaded programs, creating a pathway for unauthorized code execution through deception techniques. This weakness exists within the installation process where the system should verify the authenticity of components before proceeding with execution, but instead accepts potentially malicious code as legitimate due to insufficient signature validation.
The technical exploitation of this vulnerability occurs through a sophisticated social engineering attack vector where remote attackers manipulate the CSD installation process to present forged or spoofed installation components. The ActiveX control in question is designed to facilitate automated installation of Cisco Secure Desktop components but fails to implement proper cryptographic verification of the downloaded program's digital signature. This failure allows attackers to substitute legitimate installation packages with malicious counterparts that appear to be valid Cisco components, thereby tricking the system into executing unauthorized code. The vulnerability operates at the intersection of code signing validation and installation process integrity, making it particularly dangerous as it exploits trust relationships within the software installation framework. According to CWE classification, this represents a weakness in cryptographic signature verification where insufficient validation allows malicious code execution through spoofed components.
The operational impact of CVE-2011-0926 extends beyond simple code execution to encompass potential full system compromise and persistent access within targeted environments. When successfully exploited, attackers can gain arbitrary code execution privileges on systems where Cisco Secure Desktop is installed, potentially leading to complete system takeover, data exfiltration, or establishment of persistent backdoors. The vulnerability affects organizations using Cisco Secure Desktop for remote access and secure desktop solutions, making it particularly dangerous in enterprise environments where privileged access is common. Security researchers have noted that this vulnerability can be leveraged as a stepping stone for broader network infiltration, as it allows attackers to establish initial access points that can be used to escalate privileges and move laterally within networks. The attack vector operates through web-based delivery mechanisms, making it accessible to threat actors without requiring physical access to target systems.
Mitigation strategies for CVE-2011-0926 focus on both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. Organizations should prioritize immediate patching of affected Cisco Secure Desktop installations to version 3.2 or later, where the signature verification mechanism has been properly enhanced. System administrators should implement strict ActiveX control restrictions and disable unnecessary ActiveX components in web browsers to reduce attack surface exposure. Network segmentation and application whitelisting policies can provide additional protection layers against exploitation attempts. The vulnerability demonstrates the importance of proper code signing validation in installation processes and aligns with ATT&CK technique T1218.001 for Office Application Software, highlighting the need for comprehensive software integrity verification. Organizations should also consider implementing security monitoring solutions that can detect anomalous installation behavior and signature validation failures. Regular security assessments of ActiveX controls and other legacy components are essential to identify similar weaknesses in other software systems that may present comparable risks. The vulnerability serves as a critical reminder of the importance of robust cryptographic verification in software installation processes and the potential consequences of inadequate signature validation mechanisms.