CVE-2025-48756 in scsir Crate
Summary
by MITRE • 05/24/2025
In group_number in the scsir crate 0.2.0 for Rust, there can be an overflow because a hardware device may expect a small number of bits (e.g., 5 bits) for group number.
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Analysis
by VulDB Data Team • 01/30/2026
The vulnerability identified as CVE-2025-48756 resides within the scsir crate version 0.2.0 for the Rust programming language, specifically affecting the group_number function implementation. This flaw represents a classic integer overflow condition that occurs when processing SCSI (Small Computer System Interface) device communications where hardware devices expect limited bit widths for group number fields. The vulnerability manifests when the software attempts to handle group numbers that are constrained to small bit sizes such as 5 bits, creating a scenario where normal arithmetic operations can exceed the maximum representable value for the target data type.
The technical implementation flaw stems from insufficient validation and overflow checking when processing group number values that originate from hardware devices. In SCSI communications, group numbers are used to categorize commands or data within specific protocols, and these fields are often constrained by hardware specifications to particular bit widths. When the Rust crate processes these values without proper bounds checking, it fails to account for the possibility that a 5-bit field might overflow when converted to a larger integer type during processing. This creates an environment where malicious or faulty hardware could potentially trigger arithmetic overflow conditions that could lead to unpredictable behavior in the system.
The operational impact of this vulnerability extends beyond simple computational errors, as it could potentially enable attackers to manipulate SCSI command processing through carefully crafted device responses. When a hardware device returns a group number that exceeds the expected bit width, the overflow condition could result in incorrect command interpretation, data corruption, or potentially unauthorized access to system resources. The vulnerability particularly affects systems that rely on the scsir crate for SCSI communication handling, which could include storage servers, backup systems, and enterprise computing environments where SCSI interfaces are prevalent.
This vulnerability aligns with CWE-190, Integer Overflow or Wraparound, which specifically addresses issues where integer arithmetic operations produce results that exceed the maximum value representable by the data type. The ATT&CK framework categorizes this type of vulnerability under T1210, Exploitation of Remote Services, as it could potentially be exploited through manipulation of SCSI device communications to achieve system compromise. The scsir crate's function group_number serves as a critical interface point where the vulnerability could be triggered, making it a potential entry point for attackers targeting systems with SCSI connectivity.
Mitigation strategies should focus on implementing proper bounds checking and integer overflow protection within the group_number function, ensuring that all input values from hardware devices are validated against their expected bit widths before processing. Developers should employ Rust's built-in overflow checking mechanisms or implement explicit validation routines that prevent arithmetic operations from exceeding the maximum representable values for the targeted data types. Additionally, system administrators should consider updating to patched versions of the scsir crate and implementing monitoring for anomalous SCSI communications that might indicate exploitation attempts. The vulnerability highlights the importance of rigorous input validation in systems that interface with hardware devices where field constraints are not always explicitly enforced by the programming language runtime.