CVE-2006-3426 in ZENworks
Summary
by MITRE
Directory traversal vulnerability in (a) PatchLink Update Server (PLUS) before 6.1 P1 and 6.2.x before 6.2 SR1 P1 and (b) Novell ZENworks 6.2 SR1 and earlier allows remote attackers to overwrite arbitrary files and directories via a .. (dot dot) sequence in the (1) action, (2) agentid, or (3) index parameters to dagent/nwupload.asp, which are used as pathname components.
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Analysis
by VulDB Data Team • 06/23/2019
The vulnerability identified as CVE-2006-3426 represents a critical directory traversal flaw affecting PatchLink Update Server (PLUS) versions prior to 6.1 P1 and 6.2.x before 6.2 SR1 P1, as well as Novell ZENworks 6.2 SR1 and earlier versions. This security weakness resides in the dagent/nwupload.asp component where multiple parameters including action, agentid, and index are susceptible to manipulation through directory traversal sequences. The vulnerability stems from insufficient input validation and improper handling of pathname components, allowing attackers to craft malicious requests that can navigate outside the intended directory structure and access arbitrary files on the target system.
The technical implementation of this vulnerability exploits the fundamental flaw in path normalization and validation mechanisms within the affected software components. When attackers submit requests containing .. (dot dot) sequences in the specified parameters, the application fails to properly sanitize these inputs before using them as directory path components. This allows the attacker to traverse up the directory hierarchy and potentially overwrite critical system files, directories, or configuration files. The vulnerability specifically affects the file upload functionality where the application processes these parameters without adequate security checks, creating a pathway for unauthorized file system modifications.
From an operational perspective, this vulnerability presents significant risks to organizations relying on these update management systems. Remote attackers can leverage this weakness to execute arbitrary file overwrite operations, potentially leading to complete system compromise, data corruption, or service disruption. The impact extends beyond simple file modification as attackers could replace critical system binaries, configuration files, or even create backdoor access points within the update infrastructure. The vulnerability affects both PatchLink Update Server and Novell ZENworks deployments, which are commonly used for enterprise software patch management, making the potential attack surface particularly wide.
The security implications align with CWE-22 Directory Traversal vulnerability classification, which specifically addresses improper input validation leading to unauthorized access to files and directories. This vulnerability also maps to several ATT&CK techniques including T1059 Command and Scripting Interpreter and T1486 Data Encrypted for Impact, as attackers can manipulate the update infrastructure to deploy malicious payloads or disrupt normal operations. Organizations using affected systems face potential compromise of their entire patch management ecosystem, as successful exploitation could allow attackers to modify the update process itself, potentially leading to persistent backdoors or the deployment of malicious updates to other systems. The remediation requires immediate patching of affected versions, implementation of proper input validation, and consideration of network segmentation to limit the potential impact of such attacks.