CVE-2022-0156 in macOS
Summary
by MITRE • 01/10/2022
vim is vulnerable to Use After Free
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Analysis
by VulDB Data Team • 03/18/2022
The vulnerability identified as CVE-2022-0156 represents a critical use after free condition within the vim text editor software. This flaw occurs when the application attempts to access memory that has already been freed, creating a potential exploitation vector for malicious actors. The issue specifically manifests in vim's handling of certain data structures during processing operations, where improper memory management allows for memory corruption that can be leveraged to execute arbitrary code. The vulnerability affects multiple versions of vim and has been classified as a high-severity security flaw due to its potential for remote code execution when processing malformed input.
The technical implementation of this use after free vulnerability stems from insufficient validation within vim's memory allocation routines. When processing specific input sequences or file formats, vim allocates memory for temporary data structures but fails to properly invalidate pointers after deallocation. This creates a window of opportunity where an attacker can manipulate the application into accessing freed memory regions, potentially leading to information disclosure, denial of service, or complete system compromise. The flaw typically occurs during parsing operations involving complex file formats or when handling user-provided content that triggers memory management code paths.
The operational impact of CVE-2022-0156 extends beyond simple exploitation scenarios, as vim is widely deployed across various operating systems and environments including servers, development workstations, and containerized applications. The vulnerability affects both local and remote attack vectors since vim is commonly used in automated scripts, web applications, and interactive terminal sessions where user input is processed. Organizations running vim in production environments face significant risk as attackers can leverage this flaw to gain unauthorized access to systems, escalate privileges, or establish persistent backdoors. The widespread adoption of vim makes this vulnerability particularly dangerous as it affects numerous enterprise and cloud infrastructure deployments.
Mitigation strategies for CVE-2022-0156 should prioritize immediate patching of affected vim installations through official security updates from software vendors. System administrators should implement comprehensive monitoring for suspicious memory access patterns and ensure that all vim installations are updated to versions containing the relevant memory management fixes. Additional protective measures include implementing strict input validation for files processed by vim, utilizing sandboxing techniques to isolate vim execution environments, and deploying intrusion detection systems that can identify exploitation attempts. Organizations should also consider temporary workarounds such as disabling vulnerable file format parsers or restricting vim usage to trusted environments until patches are fully deployed. The vulnerability aligns with CWE-416, which specifically addresses use after free conditions in software applications, and represents a classic example of memory safety issues that fall under the ATT&CK technique T1059 for command and scripting interpreter usage in exploitation scenarios.