CVE-2016-9888 in Structured File Library
Summary
by MITRE
An error within the "tar_directory_for_file()" function (gsf-infile-tar.c) in GNOME Structured File Library before 1.14.41 can be exploited to trigger a Null pointer dereference and subsequently cause a crash via a crafted TAR file.
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Analysis
by VulDB Data Team • 09/15/2024
The vulnerability identified as CVE-2016-9888 resides within the GNOME Structured File Library, specifically within the gsf-infile-tar.c module where the tar_directory_for_file() function exhibits a critical flaw that can be exploited to cause a denial of service condition. This library serves as a fundamental component for handling structured file formats within the GNOME desktop environment and various applications that rely on it for file processing operations. The vulnerability manifests when processing specially crafted TAR archive files that contain malformed directory entries or improper metadata structures, leading to a null pointer dereference condition that terminates the application process.
The technical exploitation of this vulnerability occurs through the manipulation of TAR file structures where the tar_directory_for_file() function fails to properly validate directory entry pointers before attempting to access them. When the function encounters a malformed TAR archive with corrupted or missing directory information, it attempts to dereference a null pointer, causing an immediate crash of the application. This flaw represents a classic null pointer dereference vulnerability, which is categorized under CWE-476 as "NULL Pointer Dereference" and falls within the broader category of memory safety issues that can lead to system instability and potential denial of service conditions.
The operational impact of this vulnerability extends beyond simple application crashes as it affects any software system that utilizes the GNOME Structured File Library for processing TAR archives. This includes various desktop applications, file managers, backup utilities, and system administration tools that rely on proper TAR file handling capabilities. The vulnerability can be exploited by attackers who craft malicious TAR files designed to trigger the null pointer dereference, potentially allowing for remote denial of service attacks against systems that automatically process or open TAR files. The severity of this issue is particularly concerning in environments where automated file processing occurs, such as web servers, email systems, or file sharing platforms that handle untrusted archive files.
Mitigation strategies for CVE-2016-9888 primarily involve upgrading to GNOME Structured File Library version 1.14.41 or later, which contains the necessary patches to properly validate directory entries before pointer dereference operations. System administrators should implement comprehensive patch management procedures to ensure all affected systems receive the security updates promptly. Additionally, organizations can implement defensive measures such as input validation for archive files, sandboxing file processing operations, and monitoring for unusual application crash patterns that may indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1499.004 which covers "Trusted Relationship" and can be categorized under the broader ATT&CK tactic of Defense Evasion when considering how the crash can be used to disrupt normal system operations. Organizations should also consider implementing network-based intrusion detection systems that can identify patterns associated with malicious TAR file construction and deployment, as this vulnerability can be leveraged in automated attack scenarios targeting vulnerable applications.