CVE-2022-3016 in vim
Summary
by MITRE • 08/28/2022
Use After Free in GitHub repository vim/vim prior to 9.0.0285.
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Analysis
by VulDB Data Team • 10/02/2022
The vulnerability identified as CVE-2022-3016 represents a critical use-after-free condition affecting the popular vim text editor software. This issue was discovered in versions of vim prior to 9.0.0285 and resides within the GitHub repository vim/vim. The vulnerability manifests when the software attempts to access memory that has already been freed, creating a potential pathway for arbitrary code execution. Such flaws are particularly dangerous because they can be exploited to gain unauthorized access to systems or compromise the integrity of the affected software environment. The use-after-free condition typically occurs when a program continues to reference memory locations after they have been deallocated, leading to unpredictable behavior and potential security breaches.
The technical flaw within vim stems from improper memory management practices during the handling of specific buffer operations. When processing certain input sequences or file operations, the editor fails to properly track memory allocation and deallocation cycles, resulting in scenarios where freed memory blocks are still accessed by subsequent operations. This memory management error creates a race condition where an attacker can manipulate the program flow by controlling the data that gets written to the freed memory location. The vulnerability is particularly concerning in the context of text editors which frequently process untrusted input from external sources, making them attractive targets for exploitation. The flaw aligns with CWE-416, which specifically addresses the use of freed memory conditions in software applications.
The operational impact of CVE-2022-3016 extends beyond simple software instability, presenting significant security risks to users who rely on vim for their daily operations. Attackers could potentially leverage this vulnerability to execute malicious code with the privileges of the user running vim, leading to complete system compromise. The exploitability of this vulnerability is heightened due to vim's widespread deployment across various operating systems and platforms, including Linux, macOS, and Windows environments. Organizations using vim as part of their development workflows, system administration tasks, or scripting environments face elevated risk profiles. The vulnerability could be particularly dangerous in automated environments where vim is used to process configuration files or log data from potentially malicious sources.
Mitigation strategies for CVE-2022-3016 primarily focus on immediate software updates to version 9.0.0285 or later, which contains the necessary patches to address the memory management issues. System administrators should prioritize patching all affected installations across their infrastructure to minimize exposure windows. Additional protective measures include implementing strict input validation for files processed by vim, utilizing sandboxed environments for text processing tasks, and monitoring for unusual memory access patterns. The vulnerability demonstrates the importance of regular security updates and proper memory management practices in software development. Organizations should also consider implementing network segmentation and access controls to limit potential exploitation paths, as outlined in the mitre ATT&CK framework for privilege escalation techniques. Security teams should monitor for indicators of compromise related to this vulnerability and ensure that their incident response procedures include specific protocols for addressing use-after-free conditions in widely deployed software applications.