CVE-2003-0924 in netpbm
Summary
by MITRE
netpbm 9.25 and earlier does not properly create temporary files, which allows local users to overwrite arbitrary files.
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability identified as CVE-2003-0924 affects netpbm version 9.25 and earlier, representing a critical security flaw in the handling of temporary files within the netpbm image processing suite. This issue stems from improper temporary file creation mechanisms that create opportunities for local privilege escalation and arbitrary file overwrite attacks. The vulnerability resides in the fundamental file system operations that netpbm employs when processing image files, specifically in how temporary files are generated and managed during image conversion and manipulation processes. The flaw enables attackers with local access to manipulate the temporary file creation sequence and subsequently overwrite files of their choosing, potentially leading to system compromise or data corruption.
The technical implementation of this vulnerability aligns with CWE-377, which addresses insecure temporary file creation practices in software applications. When netpbm processes image files, it creates temporary files in predictable locations without proper security measures to prevent race conditions or unauthorized access. The flaw occurs because the application uses insecure methods for temporary file generation, typically involving predictable naming patterns or insufficient permission controls on temporary file directories. Attackers can exploit this by creating symbolic links or manipulating the file system in such a way that their chosen target files are overwritten when netpbm attempts to create its temporary files. This vulnerability operates at the file system level and represents a classic example of insecure file handling that has been documented in numerous security advisories over the years.
From an operational impact perspective, this vulnerability presents significant risks to systems running vulnerable versions of netpbm, particularly in multi-user environments or when the software is executed with elevated privileges. The local nature of the attack means that any user with access to the system can potentially exploit this vulnerability, making it particularly dangerous in shared computing environments where privilege separation is not strictly enforced. The arbitrary file overwrite capability allows attackers to modify critical system files, configuration data, or user files, potentially leading to complete system compromise or data loss. In enterprise environments, this vulnerability could be leveraged to establish persistent access or to disrupt critical image processing workflows that depend on netpbm functionality. The vulnerability also represents a potential vector for privilege escalation attacks, as attackers might overwrite system binaries or configuration files to gain elevated privileges.
Mitigation strategies for CVE-2003-0924 should focus on immediate software updates to versions that address the temporary file creation issues, typically through patches that implement secure temporary file creation mechanisms. System administrators should ensure that all instances of netpbm are updated to versions that properly handle temporary files using secure methods such as creating files with unique names and appropriate permissions, or using secure temporary directories with restricted access. The implementation of proper file system permissions and access controls can help reduce the attack surface, while monitoring systems should be deployed to detect unauthorized file modifications. Organizations should also consider implementing least privilege principles when running netpbm processes, ensuring that the software operates with minimal required permissions. Additionally, regular security audits and vulnerability assessments should be conducted to identify and remediate similar insecure file handling practices in other applications within the system. This vulnerability serves as a reminder of the critical importance of secure temporary file handling practices in software development and the potential consequences of inadequate security controls in file system operations. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the use of insecure file permissions and predictable temporary file locations as methods for gaining elevated system access.