CVE-2006-0892 in NOCC
Summary
by MITRE
NOCC Webmail 1.0 stores e-mail attachments in temporary files with predictable filenames, which makes it easier for remote attackers to execute arbitrary code by accessing the e-mail attachment via directory traversal vulnerabilities.
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Analysis
by VulDB Data Team • 06/15/2019
The vulnerability identified as CVE-2006-0892 affects NOCC Webmail version 1.0 and represents a critical security flaw in how the application handles email attachment storage. This issue stems from the application's use of predictable temporary filenames when storing email attachments, creating a significant attack surface that can be exploited by remote adversaries. The vulnerability falls under the category of predictable temporary filename generation, which is classified as CWE-377, and specifically relates to CWE-22 which addresses directory traversal vulnerabilities. The flaw exists in the application's temporary file management system where attachments are stored using easily guessable naming conventions, making it possible for attackers to predict and access these temporary files directly.
The technical implementation of this vulnerability occurs when NOCC Webmail processes incoming email attachments and stores them in temporary directories using predictable naming patterns. When an email is received with an attachment, the application generates temporary filenames based on simple patterns that can be easily guessed by an attacker. This predictable naming scheme, combined with directory traversal vulnerabilities in the web application's file access mechanisms, allows remote attackers to navigate to the temporary storage directories and access the attachment files directly. The combination of these two issues creates a path traversal scenario where attackers can bypass normal access controls and potentially execute arbitrary code on the server.
The operational impact of this vulnerability is severe and multifaceted, affecting both the confidentiality and integrity of email communications within the affected system. Attackers can exploit this vulnerability to access sensitive email attachments that may contain confidential information, personal data, or business-critical documents. The ability to execute arbitrary code through this vector represents a significant escalation of privileges, potentially allowing attackers to gain full control over the webmail server. This vulnerability also impacts the system's availability as attackers could potentially corrupt or delete temporary files, disrupting legitimate email services. The attack surface is particularly concerning given that the vulnerability affects a web-based email application, meaning that exploitation can occur from any location with internet access, making it a widespread threat to organizations using this specific version of NOCC Webmail.
Mitigation strategies for this vulnerability must address both the predictable filename generation and the directory traversal issues. The most effective immediate solution involves implementing random or cryptographically secure temporary filename generation that eliminates predictability in the naming scheme. Organizations should also implement proper input validation and sanitization to prevent directory traversal attacks, ensuring that all file access operations properly validate path parameters. The application should enforce strict access controls and implement proper file permissions on temporary directories to prevent unauthorized access. Additionally, implementing proper logging and monitoring of file access operations can help detect potential exploitation attempts. From a defensive perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter, as attackers may leverage the ability to execute code through the compromised attachment access. Regular security updates and patches should be implemented immediately, and organizations should consider migrating to more secure email solutions that properly address temporary file management and access control mechanisms.