CVE-2005-3632 in netpbm
Summary
by MITRE
Multiple buffer overflows in pnmtopng in netpbm 10.0 and earlier allow attackers to execute arbitrary code via a crafted PNM file.
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Analysis
by VulDB Data Team • 06/13/2019
The vulnerability identified as CVE-2005-3632 represents a critical security flaw affecting the pnmtopng utility within the netpbm image processing toolkit version 10.0 and earlier. This issue stems from multiple buffer overflow conditions that occur when processing specially crafted PNM (Portable AnyMap) image files. The pnmtopng utility serves as a converter that transforms PNM format images into PNG format, making it a common component in image processing workflows across various operating systems and applications. The buffer overflows manifest when the utility fails to properly validate input data length against allocated memory buffers, creating opportunities for malicious actors to inject and execute arbitrary code on affected systems. These vulnerabilities fall under the CWE-121 buffer overflow category, which specifically addresses buffer allocation and management issues that can lead to code execution.
The technical exploitation of this vulnerability requires an attacker to craft a malicious PNM file that contains oversized data structures or malformed headers that exceed the bounds of allocated memory buffers within the pnmtopng utility. When the utility processes such a file, the overflow conditions can overwrite adjacent memory regions including return addresses and function pointers, allowing attackers to redirect program execution flow and inject malicious code. This type of vulnerability is particularly dangerous because it can be triggered through automated processing of image files, making it exploitable in both local and remote attack scenarios. The ATT&CK framework categorizes this as a code injection technique under the T1059.007 sub-technique, where adversaries leverage buffer overflow conditions to execute arbitrary commands on compromised systems.
The operational impact of CVE-2005-3632 extends beyond simple code execution, as it can provide attackers with complete system compromise capabilities. When successfully exploited, the vulnerability allows for privilege escalation and persistent access to affected systems, potentially enabling data exfiltration, lateral movement, and further network infiltration. The vulnerability affects systems where netpbm is installed and used for image processing, which includes web servers, image processing applications, and various automation tools that rely on this utility. Organizations running vulnerable versions of netpbm face significant risk, particularly in environments where untrusted image files are processed automatically or where the utility is used in web applications. The widespread adoption of netpbm across different platforms and applications means that this vulnerability could impact numerous systems without proper patching or mitigation.
Mitigation strategies for CVE-2005-3632 primarily focus on immediate software updates and system hardening measures. The most effective solution involves upgrading to netpbm version 10.1 or later, where the buffer overflow conditions have been addressed through proper input validation and memory management practices. System administrators should also implement input validation controls to restrict processing of untrusted image files, particularly in automated environments where the pnmtopng utility might be invoked without proper safeguards. Additional protective measures include implementing sandboxing techniques, using privilege separation, and deploying network segmentation to limit potential impact if exploitation occurs. The vulnerability demonstrates the importance of proper memory management in image processing libraries and highlights the need for regular security assessments of commonly used utilities. Organizations should also consider implementing security monitoring to detect suspicious file processing activities and ensure that all systems using netpbm are regularly updated to prevent exploitation of known vulnerabilities.