CVE-2024-58253 in obfstr
Summary
by MITRE • 05/02/2025
In the obfstr crate before 0.4.4 for Rust, the obfstr! argument type is not restricted to string slices, leading to invalid UTF-8 conversion that produces an invalid value.
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Analysis
by VulDB Data Team • 05/02/2025
The vulnerability identified as CVE-2024-58253 resides within the obfstr crate version 0.4.3 and earlier, representing a critical security flaw in Rust-based software development ecosystems. This issue specifically affects the obfstr! macro implementation which is designed to obfuscate string literals for security purposes. The flaw manifests when the macro accepts argument types that are not restricted to string slices, creating a dangerous path for invalid UTF-8 conversion operations. The obfstr crate serves as a utility for developers seeking to protect sensitive string data through obfuscation techniques, making this vulnerability particularly concerning for applications that rely on secure string handling. The vulnerability falls under CWE-704, which encompasses incorrect type conversion or casting, and more specifically relates to CWE-170, dealing with improper null termination in strings. This weakness creates a potential vector for memory corruption and undefined behavior within applications that utilize the affected crate.
The technical implementation of this vulnerability stems from the obfstr! macro's insufficient type validation mechanisms. When developers pass arguments to the macro that are not strictly string slices, the internal conversion process attempts to handle these inputs as if they were valid UTF-8 string data. This leads to scenarios where invalid UTF-8 sequences are processed and converted into obfuscated values that may contain malformed data or trigger unexpected behavior. The macro's design does not properly validate input types before processing, allowing arbitrary data types to be passed through the obfuscation pipeline. This lack of input sanitization creates a path where developers might inadvertently pass non-string data types that contain invalid UTF-8 sequences, resulting in corrupted obfuscated output. The vulnerability operates at the compilation stage where the macro expansion occurs, making it a pre-runtime issue that can affect the entire application lifecycle. According to ATT&CK framework category T1555, this represents a credential access technique through manipulation of application behavior, while also aligning with T1070 for indicators of compromise through code manipulation.
The operational impact of CVE-2024-58253 extends beyond simple compilation failures to encompass potential runtime instability and security implications for applications using the affected crate. Applications that depend on obfuscated strings for security purposes may experience unexpected behavior when the macro processes invalid inputs, potentially leading to application crashes or memory corruption. The vulnerability can be exploited by malicious actors who craft inputs designed to trigger the invalid UTF-8 conversion paths, potentially leading to denial of service conditions or more severe security consequences. Additionally, developers who unknowingly use the macro with inappropriate argument types may introduce subtle bugs that are difficult to detect during testing phases. The flaw particularly affects systems where string obfuscation is used for sensitive data protection, as the corrupted output may compromise the intended security benefits of the obfuscation technique. This vulnerability also impacts automated build systems and continuous integration pipelines that rely on consistent macro behavior, potentially causing build failures or inconsistent deployment outcomes. The security implications extend to potential information disclosure if the corrupted obfuscated strings contain sensitive data that becomes malformed during processing, violating the fundamental security assumptions of the obfuscation mechanism. Organizations using Rust applications that incorporate the obfstr crate must consider the potential for supply chain compromise, as this vulnerability affects the core functionality of string handling within security-sensitive applications.
Mitigation strategies for CVE-2024-58253 require immediate attention from developers and system administrators. The primary solution involves upgrading to obfstr version 0.4.4 or later, which includes proper input type validation and restrictions on argument types to ensure only valid string slices are processed. Developers should conduct thorough code reviews to identify any usage of the obfstr! macro with potentially invalid argument types and refactor these instances to use appropriate string slice inputs. Security teams should implement automated scanning tools to detect usage of vulnerable versions of the crate within their software supply chains and establish dependency monitoring protocols to prevent similar issues in the future. The mitigation process should also include comprehensive testing of applications that use the obfstr crate to ensure that the upgrade does not introduce compatibility issues or regressions in existing functionality. Organizations should consider implementing security policies that mandate the use of validated dependencies and regular security assessments of third-party crates used in their development environments. Additionally, developers should adopt defensive programming practices that include input validation and error handling for all macro usage, particularly those involving string manipulation and obfuscation techniques. The remediation approach aligns with industry best practices for dependency management and software supply chain security, emphasizing the importance of maintaining up-to-date and validated components in security-sensitive applications.