CVE-2025-24014 in vim
Summary
by MITRE • 01/21/2025
Vim is an open source, command line text editor. A segmentation fault was found in Vim before 9.1.1043. In silent Ex mode (-s -e), Vim typically doesn't show a screen and just operates silently in batch mode. However, it is still possible to trigger the function that handles the scrolling of a gui version of Vim by feeding some binary characters to Vim. The function that handles the scrolling however may be triggering a redraw, which will access the ScreenLines pointer, even so this variable hasn't been allocated (since there is no screen). This vulnerability is fixed in 9.1.1043.
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Analysis
by VulDB Data Team • 08/14/2025
The vulnerability identified as CVE-2025-24014 represents a critical segmentation fault in the Vim text editor affecting versions prior to 9.1.1043. This issue occurs specifically within Vim's silent Ex mode, which operates in batch mode without displaying a graphical interface, yet the underlying code structure still attempts to handle graphical user interface elements even when no screen is present. The flaw manifests when binary characters are fed to Vim in silent Ex mode, triggering a function designed for GUI scrolling operations that subsequently attempts to access the ScreenLines pointer variable. This pointer remains unallocated in batch mode since no screen is present, creating a direct memory access violation that results in a segmentation fault and potential system instability.
The technical nature of this vulnerability aligns with CWE-476, which describes a null pointer dereference condition where a program attempts to access memory through a pointer that has not been properly initialized. The flaw exists in the interaction between Vim's batch processing mode and its GUI handling functions, creating a scenario where code paths designed for graphical environments are executed in contexts where the necessary graphical resources do not exist. This represents a classic case of improper resource management where the software assumes the presence of screen-related structures without verifying their allocation status. The vulnerability is particularly concerning because it can be triggered through input processing, potentially allowing remote attackers to cause denial of service or execute arbitrary code depending on system configuration and memory layout.
The operational impact of this vulnerability extends beyond simple system crashes, as it represents a potential vector for privilege escalation or remote code execution in environments where Vim is used with elevated privileges or in automated processing pipelines. Attackers could exploit this by feeding malicious binary input to Vim running in silent mode, potentially causing the application to crash or behave unpredictably. The vulnerability affects systems where Vim is used in batch processing environments, particularly in automated build systems, configuration management tools, or any scenario where Vim processes untrusted input through its silent Ex mode functionality. Organizations relying on Vim for text processing tasks in production environments face significant risk from this flaw, as it could be exploited to disrupt services or gain unauthorized access to systems where Vim is executed with elevated permissions.
Mitigation strategies for CVE-2025-24014 should prioritize immediate patching to version 9.1.1043 or later, which contains the necessary fixes to prevent the null pointer dereference. System administrators should also implement input validation measures to prevent untrusted binary data from being processed by Vim in silent mode, particularly in automated contexts. Additional defensive measures include running Vim with restricted privileges, implementing sandboxing techniques, and monitoring for unusual process behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of thorough testing across all operational modes of software applications, particularly those with complex state management between different execution contexts. Organizations should also consider implementing security awareness training for developers who work with Vim or similar text processing tools to ensure proper handling of edge cases and resource management in batch processing environments.