Overview
CVE-2025-36903 is a critical security vulnerability that potentially allows an attacker to perform an out-of-bounds read/write operation due to improper input validation. This vulnerability is particularly concerning as it can lead to a local escalation of privilege, potentially compromising system security and leading to data leakage. User interaction is not necessary for the exploitation of this vulnerability, increasing its potential impact.
Vulnerability Summary
CVE ID: CVE-2025-36903
Severity: High (7.8)
Attack Vector: Local
Privileges Required: None
User Interaction: Not Required
Impact: Local escalation of privileges leading to potential system compromise and data leakage
Affected Products
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Product | Affected Versions
lwis_io | All prior to version x.y.z
How the Exploit Works
The vulnerability arises from the lwis_io_buffer_write function, which fails to properly validate input data. This failure can allow an attacker to initiate an out-of-bounds (OOB) read/write operation. These operations can access or modify data that is outside the intended boundary of a buffer, leading to corruption of relevant data, a crash, or code execution. In this case, the OOB operation could lead to local escalation of privileges.
Conceptual Example Code
Below is a conceptual example of an exploit. The malicious payload is designed to trigger the OOB operation, taking advantage of the improper input validation.
$ ./lwis_io_buffer_write --input "malicious_payload"This example is purely conceptual. The “malicious_payload” would be specifically crafted to exploit the OOB vulnerability.
Mitigation Measures
Users are advised to apply the vendor patch as soon as it becomes available. If the patch is not yet available or cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.
