CVE-2025-9390 in vim
Summary
by MITRE • 08/24/2025
A security flaw has been discovered in vim up to 9.1.1615. Affected by this vulnerability is the function main of the file src/xxd/xxd.c of the component xxd. The manipulation results in buffer overflow. The attack requires a local approach. The exploit has been released to the public and may be exploited. Upgrading to version 9.1.1616 addresses this issue. The patch is identified as eeef7c77436a78cd27047b0f5fa6925d56de3cb0. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 09/12/2025
The vulnerability identified as CVE-2025-9390 represents a critical buffer overflow flaw within the vim text editor's xxd component, specifically affecting the main function in src/xxd/xxd.c. This security weakness arises from inadequate bounds checking during buffer operations, creating an exploitable condition that can be leveraged by local attackers to execute arbitrary code or cause system instability. The vulnerability manifests when the xxd utility processes malformed input data, allowing an attacker to overwrite adjacent memory locations through improper buffer handling mechanisms.
The technical implementation of this flaw stems from insufficient input validation within the xxd utility's main function, which is designed to convert binary files into hexadecimal format or vice versa. When processing specially crafted input files, the function fails to properly validate the size of data being copied into fixed-size buffers, creating a classic buffer overflow condition. This vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a direct violation of secure coding practices that mandate proper bounds checking and memory management. The attack vector requires local system access, making it particularly concerning for environments where privilege escalation or code execution could lead to broader system compromise.
Operational impact assessment reveals that this vulnerability poses significant risks to systems where vim and its xxd utility are actively used for file processing tasks. The public availability of exploit code increases the likelihood of successful exploitation across various environments, particularly in development workstations, server environments, or any system where users might process untrusted binary data through the xxd utility. Attackers can leverage this flaw to execute arbitrary commands with the privileges of the user running vim, potentially leading to privilege escalation or complete system compromise. The vulnerability's presence in a widely-used text editor utility means that exploitation could occur in numerous scenarios including automated build systems, security auditing tools, or any workflow that relies on vim's binary processing capabilities.
Mitigation strategies should prioritize immediate upgrade to vim version 9.1.1616, which incorporates the patch identified by commit hash eeef7c77436a78cd27047b0f5fa6925d56de3cb0. Organizations should also implement additional protective measures including restricting local access to vim installations, employing input validation for all binary data processed through xxd utilities, and monitoring system logs for suspicious execution patterns. The fix addresses the root cause by implementing proper bounds checking and memory allocation validation within the affected function, aligning with ATT&CK technique T1059.007 for execution through command and script interpreters. System administrators should also consider implementing privilege separation mechanisms and restricting user access to sensitive system components to minimize potential impact from successful exploitation attempts.