CVE-2001-0110 in JaZip
Summary
by MITRE
Buffer overflow in jaZip Zip/Jaz drive manager allows local users to gain root privileges via a long DISPLAY environmental variable.
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Analysis
by VulDB Data Team • 10/19/2024
The vulnerability identified as CVE-2001-0110 represents a classic buffer overflow flaw within the jaZip Zip/Jaz drive manager software, which was widely used for managing storage devices in unix-like operating systems. This particular implementation flaw existed within the handling of environmental variables, specifically the DISPLAY variable that is commonly used in graphical user interface environments to specify the X11 display server. The vulnerability arises from inadequate input validation and bounds checking within the jaZip application's code, where it fails to properly sanitize the length of the DISPLAY environment variable before processing it. When a local user provides an excessively long DISPLAY variable, the application's buffer management routines overflow, potentially allowing arbitrary code execution with elevated privileges.
The technical exploitation of this vulnerability occurs through a local privilege escalation vector where an attacker with shell access can manipulate the DISPLAY environment variable to trigger the buffer overflow condition. This flaw is particularly dangerous because it allows a local user to escalate their privileges to root level without requiring authentication or network access. The buffer overflow typically occurs in the application's memory management routines where it copies the DISPLAY variable contents into a fixed-size buffer without proper bounds checking. This creates a situation where the overflow can overwrite adjacent memory locations including return addresses and system control structures, potentially allowing an attacker to redirect execution flow and execute malicious code with root privileges.
The operational impact of CVE-2001-0110 extends beyond simple privilege escalation to encompass broader system compromise and potential denial of service conditions. System administrators face significant risk when this vulnerability exists, as local users can exploit it to gain unauthorized root access to systems running affected versions of jaZip. The vulnerability affects systems that utilize the jaZip software for storage management, particularly in enterprise environments where multiple users share systems and where the software is installed with setuid permissions. This creates an attack surface where any user with shell access can potentially compromise the entire system. The exploitability of this vulnerability is enhanced by the fact that it does not require network connectivity or specialized tools, making it particularly dangerous in multi-user environments.
Mitigation strategies for CVE-2001-0110 focus on both immediate remediation and long-term architectural improvements. The primary recommendation involves applying vendor patches or upgrading to versions of jaZip that properly validate environmental variable lengths and implement proper buffer management techniques. System administrators should also consider implementing strict environment variable controls and monitoring for unusual DISPLAY variable lengths. The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1068, which covers exploit for privilege escalation. Additionally, implementing proper input validation and bounds checking mechanisms in all applications that process environmental variables can prevent similar issues. Organizations should also consider implementing principle of least privilege models where applications do not run with unnecessary elevated permissions, and regularly audit installed software for known vulnerabilities. The vulnerability underscores the critical importance of secure coding practices, particularly around buffer management and input validation, which are fundamental requirements in secure software development lifecycle processes.