CVE-2026-111282 in iso14229
Summary
by MITRE • 10/16/2026
Driftregion iso14229 before 0.10.1 contains an integer wraparound in Handle_0x38_RequestFileTransfer that lets unauthenticated attackers bypass the file path length check. Attackers can send a short RequestFileTransfer (SID 0x38) request with filePathAndNameLength 0xFFFC-0xFFFF, causing callbacks to read past the receive buffer, crashing targets or disclosing memory.
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified in Driftregion ISO14229 prior to version 0.10.1 represents a critical security flaw within the implementation of the RequestFileTransfer service, specifically under Service Identifier 0x38. This defect stems from an integer wraparound condition that occurs during the processing of the filePathAndNameLength field in incoming requests. In compliant ISO14229 implementations, this length parameter dictates how much data is to be read or processed relative to a provided file path buffer. The flaw arises because the library fails to adequately validate whether the specified length results in an arithmetic overflow when combined with other offset calculations or pointer increments used for memory access operations.
When an unauthenticated attacker sends a crafted RequestFileTransfer request containing a filePathAndNameLength value within the range of 0xFFFC to 0xFFFF, the internal logic interprets this large unsigned integer as a small positive number due to wraparound behavior typical in fixed-width integer arithmetic without proper bounds checking. Consequently, the system bypasses standard file path length checks that are designed to prevent buffer overflows or out-of-bounds access. This misinterpretation allows the application to proceed with memory operations based on an incorrect, significantly smaller size than intended by the attacker's input, leading to a mismatch between expected and actual memory boundaries.
The operational impact of this vulnerability is severe, primarily manifesting as either denial of service or unauthorized information disclosure. Because the callback functions responsible for handling the file transfer read past the allocated receive buffer based on the miscalculated length, they access memory locations outside the intended scope. This out-of-bounds read can cause immediate application crashes by triggering segmentation faults or other fatal exceptions when accessing invalid memory addresses. Alternatively, if the system does not crash immediately, it may leak sensitive data from adjacent memory regions into the response stream, potentially exposing internal state variables, cryptographic keys, or other confidential information to the attacker.
From a classification perspective, this vulnerability aligns with CWE-190, which describes integer overflow or wraparound issues that lead to subsequent security weaknesses such as buffer overflows or out-of-bounds reads. It also relates closely to CWE-20, indicating improper input validation where negative values or large unsigned integers are not correctly handled before being used in memory allocation or access routines. In the context of the MITRE ATT&CK framework for automotive systems, this exploit technique falls under T1638, which covers exploitation of remote services and protocols like UDS (Unified Diagnostic Services) to gain unauthorized access or disrupt service availability.
Mitigation strategies must focus on rigorous input validation and defensive programming practices within the ISO14229 stack implementation. Developers should enforce strict upper bounds on all length parameters received from external sources, ensuring that values exceeding reasonable maximums for file paths are rejected before any arithmetic operations occur. Additionally, implementing checks to detect potential integer overflows prior to their use in pointer calculations is essential. Upgrading to version 0.10.1 or later of Driftregion ISO14229 resolves this issue by correcting the handling of these edge cases. For systems where immediate patching is not feasible, deploying network-level filters that inspect UDS payloads for suspiciously large length fields in RequestFileTransfer messages can provide a temporary layer of defense against exploitation attempts.