CVE-2017-2581 in netpbm
Summary
by MITRE
An out-of-bounds write vulnerability was found in netpbm before 10.61. A maliciously crafted file could cause the application to crash or possibly allow code execution.
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Analysis
by VulDB Data Team • 04/27/2023
The vulnerability identified as CVE-2017-2581 represents a critical out-of-bounds write flaw within the netpbm image processing library ecosystem. This vulnerability specifically affects versions prior to 10.61 and stems from insufficient input validation during the parsing of image files. The netpbm suite is widely utilized for converting between various bitmap formats and serves as a foundational component in many image processing workflows across Unix-like systems and network environments. The flaw manifests when the application encounters malformed input files that trigger memory corruption during the parsing process, creating a condition where the program attempts to write data beyond the allocated memory boundaries.
Technical exploitation of this vulnerability leverages buffer overflow principles that align with CWE-787, which specifically addresses out-of-bounds write vulnerabilities. The flaw occurs during the parsing of image headers and pixel data where the application fails to properly validate the dimensions and data lengths specified in the input file. When processing maliciously crafted files, the program calculates memory allocations based on incorrect parameters provided in the file headers, leading to memory corruption that can result in arbitrary code execution or application crash. This vulnerability falls under the ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation often involves crafting specific input files to trigger the vulnerable code paths.
The operational impact of CVE-2017-2581 extends beyond simple application instability to potentially enable remote code execution in scenarios where netpbm processes untrusted image files. Systems utilizing netpbm for automated image processing, web applications handling user-uploaded images, or network services that rely on netpbm for image conversion are particularly vulnerable. The vulnerability's exploitability increases in environments where the application processes images from untrusted sources without proper sanitization. Network-based exploitation becomes possible when netpbm is used in web services or file processing pipelines where malicious users can upload crafted image files that trigger the vulnerability during processing.
Mitigation strategies for this vulnerability primarily focus on immediate version upgrades to netpbm 10.61 or later, which contain patches addressing the buffer overflow conditions. System administrators should implement comprehensive input validation measures, including file type checking and size limitations for image uploads, to reduce the attack surface. Network segmentation and privilege separation can help limit the potential impact of successful exploitation by ensuring that vulnerable applications run with minimal necessary permissions. Additionally, implementing automated scanning tools that can detect and block malformed image files before they reach the vulnerable processing components provides an additional layer of defense. Regular security audits and vulnerability assessments should include checks for outdated netpbm installations, as this vulnerability has remained relevant in various security scanning reports due to its persistent presence in older system deployments.