CVE-2019-8358 in Hiawatha
Summary
by MITRE
In Hiawatha before 10.8.4, a remote attacker is able to do directory traversal if AllowDotFiles is enabled.
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Analysis
by VulDB Data Team • 05/10/2020
The vulnerability identified as CVE-2019-8358 affects the Hiawatha web server software version 10.8.3 and earlier, representing a critical directory traversal flaw that can be exploited by remote attackers. This vulnerability specifically manifests when the AllowDotFiles configuration option is enabled, creating a pathway for unauthorized access to sensitive files and directories that should normally be restricted. The issue stems from inadequate input validation and path handling within the web server's file access mechanisms, allowing malicious actors to manipulate file paths and gain access to resources they should not be permitted to view.
The technical implementation of this vulnerability involves the improper sanitization of user-supplied input when processing file requests through the Hiawatha web server. When AllowDotFiles is enabled, the server processes requests for files that begin with a dot character, which typically indicates hidden files or system configuration elements. Attackers can exploit this by crafting malicious URL requests that include directory traversal sequences such as "../" or similar path manipulation techniques. The vulnerability falls under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This flaw enables attackers to navigate through the file system hierarchy and access files that are outside the intended web root directory, potentially exposing sensitive system information, configuration files, or even system credentials.
The operational impact of CVE-2019-8358 extends beyond simple unauthorized file access, as it can lead to complete system compromise when combined with other attack vectors. Remote attackers can leverage this vulnerability to access critical system files, configuration data, application source code, and potentially database files that are stored on the same server. The attack surface is particularly concerning because Hiawatha is often used in environments where security is paramount, including corporate networks, web hosting platforms, and applications requiring secure file access. The vulnerability can be exploited without authentication, making it particularly dangerous as it allows attackers to perform reconnaissance and gather intelligence about the target system. This aligns with ATT&CK technique T1083, which describes discovering file and directory permissions, and can serve as a foundation for more sophisticated attacks such as privilege escalation or data exfiltration.
Mitigation strategies for CVE-2019-8358 primarily focus on updating to the patched version of Hiawatha 10.8.4 or later, which addresses the directory traversal vulnerability through improved input validation and path handling mechanisms. System administrators should disable the AllowDotFiles configuration option when it is not strictly required, as this removes the attack vector entirely. Additionally, implementing proper access controls and file permissions can help limit the impact of successful exploitation attempts. Network segmentation and firewall rules can be configured to restrict access to the web server, particularly when the AllowDotFiles option is enabled. Organizations should also consider implementing web application firewalls that can detect and block malicious path traversal attempts, and conduct regular security assessments to identify and remediate similar vulnerabilities in their web server configurations. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly when dealing with file system operations and user-supplied data in web applications, which directly relates to the broader security principles outlined in the OWASP Top Ten and NIST Cybersecurity Framework.