CVE-2008-3442 in WinZip
Summary
by MITRE
WinZip before 11.0 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 • 10/02/2018
The vulnerability identified as CVE-2008-3442 represents a critical security flaw in WinZip versions prior to 11.0 that stems from inadequate update authentication mechanisms. This weakness creates a pathway for malicious actors to perform man-in-the-middle attacks by exploiting the software's failure to properly validate the authenticity of update packages. The vulnerability specifically targets the update verification process, which is a fundamental security control designed to prevent unauthorized modifications to software components. Attackers can leverage this flaw through techniques such as DNS cache poisoning or evilgrade attacks to inject malicious code into the update process, effectively compromising systems that attempt to install what they believe to be legitimate updates.
The technical implementation of this vulnerability resides in the cryptographic validation and integrity checking mechanisms within WinZip's update system. When users attempt to update their software, the application should verify the digital signatures and certificates associated with update packages to ensure they originate from legitimate sources. However, WinZip versions before 11.0 failed to perform robust verification checks, allowing attackers to present forged update packages that appear authentic to the software. This weakness aligns with CWE-310, which addresses cryptographic issues and the absence of proper validation mechanisms. The vulnerability's exploitation typically involves intercepting network traffic between the client and update servers, replacing legitimate update files with malicious payloads, and then delivering these modified packages to unsuspecting users.
The operational impact of this vulnerability extends beyond individual system compromise to potentially enable large-scale attacks across organizations that rely on WinZip for file compression and decompression tasks. When successful, these attacks can result in arbitrary code execution with the privileges of the user running WinZip, potentially leading to complete system compromise. The attack vectors demonstrated through evilgrade and DNS cache poisoning represent sophisticated techniques that exploit trust relationships within network infrastructure. Evilgrade attacks specifically target the update process by using compromised credentials or network position to deliver malicious updates, while DNS cache poisoning manipulates domain name resolution to redirect update requests to attacker-controlled servers. This vulnerability particularly affects enterprise environments where automated update processes are common, as the attack can propagate silently through the organization.
Organizations should implement multiple layers of mitigation to address this vulnerability effectively. Immediate remediation requires updating to WinZip 11.0 or later versions where proper update authentication mechanisms have been implemented. Network administrators should deploy intrusion detection systems to monitor for suspicious update traffic patterns and implement DNS security measures to prevent cache poisoning attacks. The mitigation strategy should also include user education about the importance of verifying update sources and recognizing potential security warnings. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and execution through software supply chain compromises. Security teams should establish robust software inventory management processes to track vulnerable applications and implement patch management procedures that prioritize critical vulnerabilities like CVE-2008-3442. Additionally, organizations should consider implementing network segmentation and monitoring to detect unauthorized update activities that could indicate exploitation attempts.