Compliance Impact

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Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-2863 is a path traversal vulnerability in the production_ssm and ssm-erp systems by megagao. It exists in the deleteFile function of FileServiceImpl.java, where the system improperly handles file path inputs in the /file/delete interface.'}, {'type': 'paragraph', 'content': 'The vulnerability arises because the system filters only forward slashes ("/") but fails to filter backslash ("\\") characters. This allows attackers to use sequences like "..\\" to traverse directories and delete arbitrary files outside the intended directory.'}, {'type': 'paragraph', 'content': 'An attacker can remotely exploit this flaw by sending crafted requests with manipulated fileName parameters containing directory traversal characters, enabling deletion of files outside the designated upload directory.'}] [1, 2, 3]

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Impact Analysis

This vulnerability allows an attacker to delete arbitrary files on the affected system remotely by exploiting improper input sanitization in the file deletion functionality.

The impact includes loss of data integrity and availability, as critical files outside the intended directory can be deleted, potentially disrupting system operations or causing data loss.

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for suspicious POST requests to the /file/delete interface that include directory traversal sequences, especially those using backslash characters ("\\") such as "..\\" in the fileName parameter.'}, {'type': 'paragraph', 'content': 'A typical detection method involves inspecting web server logs or network traffic for requests like:'}, {'type': 'list_item', 'content': 'POST /production_ssm_war_exploded/file/delete with payload fileName=......\\123.txt'}, {'type': 'paragraph', 'content': 'Commands to detect such attempts could include using tools like grep on server logs to find suspicious patterns:'}, {'type': 'list_item', 'content': "grep -i 'fileName=.*\\\\' /path/to/access.log"}, {'type': 'list_item', 'content': "grep -E 'fileName=.*\\.\\.\\\\' /path/to/access.log"}, {'type': 'paragraph', 'content': 'Additionally, network intrusion detection systems (NIDS) can be configured to alert on HTTP POST requests containing directory traversal sequences in parameters.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include restricting or disabling the /file/delete interface if it is not essential.'}, {'type': 'paragraph', 'content': 'If the interface must remain active, implement strict input validation and sanitization on the fileName parameter to reject any directory traversal characters, especially backslashes ("\\") and sequences like "..\\".'}, {'type': 'paragraph', 'content': 'Additionally, monitor and block suspicious requests attempting directory traversal patterns.'}, {'type': 'paragraph', 'content': "Since no official patch or version update is available due to the product's rolling release nature and lack of response from the project, consider replacing the vulnerable product with a secure alternative."}] [1, 2, 3]

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