CVE-2025-7546 in Binutils
Summary
by MITRE • 07/14/2025
A vulnerability, which was classified as problematic, has been found in GNU Binutils 2.45. Affected by this issue is the function bfd_elf_set_group_contents of the file bfd/elf.c. The manipulation leads to out-of-bounds write. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The name of the patch is 41461010eb7c79fee7a9d5f6209accdaac66cc6b. It is recommended to apply a patch to fix this issue.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 12/02/2025
CVE-2025-7546 represents a critical out-of-bounds write vulnerability within GNU Binutils version 2.45 that resides in the bfd_elf_set_group_contents function located in bfd/elf.c. This flaw constitutes a severe security weakness that allows attackers to manipulate memory boundaries through crafted input data, potentially leading to arbitrary code execution or system compromise. The vulnerability specifically affects the binary file handling capabilities of the toolchain, making it particularly dangerous in development and build environments where binutils components are extensively utilized. The issue is classified as local privilege escalation potential, as exploitation requires access to the local system where the vulnerable software is installed. According to industry standards, this vulnerability maps to CWE-787 Out-of-bounds Write, which is a fundamental memory safety issue that directly impacts the integrity of program execution and can be leveraged for privilege escalation attacks. The exploitability of this vulnerability is further enhanced by the fact that it has been publicly disclosed and is actively being used in the wild, making it a pressing concern for system administrators and security professionals. The patch referenced by the commit hash 41461010eb7c79fee7a9d5f6209accdaac66cc6b addresses the root cause by implementing proper bounds checking in the affected function, ensuring that memory operations remain within allocated boundaries. The operational impact of this vulnerability extends beyond simple memory corruption, as it can be exploited to manipulate program flow, bypass security mechanisms, or execute malicious code with the privileges of the affected process. This type of vulnerability is particularly concerning in build environments where binutils is used to process untrusted binary inputs, as attackers could leverage this weakness to compromise the entire toolchain. The ATT&CK framework categorizes this vulnerability under privilege escalation and execution techniques, specifically targeting the use of vulnerable system components to gain elevated privileges. Organizations using GNU Binutils 2.45 should immediately implement the provided patch to mitigate the risk of exploitation and ensure the integrity of their build processes. The vulnerability demonstrates the critical importance of maintaining up-to-date toolchain components and implementing robust input validation mechanisms in security-sensitive applications. Without proper patching, systems remain vulnerable to attacks that could result in complete system compromise, data theft, or persistent backdoor access through the exploitation of this memory safety flaw. The public disclosure of the exploit has accelerated the urgency for remediation, as threat actors are actively leveraging this weakness in targeted attacks against vulnerable systems.
The technical implementation of the out-of-bounds write vulnerability in bfd_elf_set_group_contents reveals a fundamental flaw in memory management within the ELF file processing subsystem. The function fails to properly validate array indices or buffer sizes before performing memory operations, creating opportunities for attackers to write data beyond allocated memory regions. This type of vulnerability is particularly dangerous because it can be triggered through normal operation of the binutils toolchain when processing malformed ELF files or group sections. The vulnerability's local attack vector means that an attacker with access to the system must only provide malicious input to the affected function, making it relatively easy to exploit in environments where users can execute arbitrary code. From a security perspective, this represents a classic memory corruption vulnerability that can be exploited using techniques such as heap spraying or return-oriented programming to achieve arbitrary code execution. The vulnerability's classification as CWE-787 emphasizes the critical nature of memory safety in system-level software, where improper bounds checking can lead to complete system compromise. The patch implementation addresses this by introducing comprehensive bounds validation that prevents any write operations beyond the legitimate memory boundaries of the target buffer. The exploitation of this vulnerability can be particularly devastating in continuous integration environments where automated build processes rely on binutils to process potentially untrusted code from multiple sources. Security researchers have noted that this vulnerability's impact is amplified by the widespread use of GNU Binutils across various operating systems and development platforms, making it a prime target for attackers seeking to compromise development infrastructure. The vulnerability's presence in the core ELF processing functionality means that even legitimate software builds could be compromised if the build environment contains malicious input files, highlighting the need for comprehensive security measures throughout the software development lifecycle.
Mitigation strategies for CVE-2025-7546 must include immediate patch application to all systems running GNU Binutils 2.45, as this represents the most effective defense against exploitation of the out-of-bounds write vulnerability. System administrators should prioritize patch deployment across all development, build, and testing environments where binutils is installed, particularly in continuous integration systems where automated builds process code from multiple sources. The patch addresses the root cause by implementing proper bounds checking in the bfd_elf_set_group_contents function, ensuring that memory operations remain within valid boundaries and preventing the exploitation of memory corruption weaknesses. Organizations should also consider implementing additional security controls such as input validation for binary files processed by binutils, sandboxing build environments, and monitoring for unusual memory access patterns that could indicate exploitation attempts. The vulnerability's public disclosure necessitates proactive security measures beyond simple patching, including network segmentation to limit potential attack vectors and enhanced logging to detect suspicious activities related to binutils usage. Security teams should also review their incident response procedures to ensure readiness for exploitation attempts targeting this vulnerability, as the public availability of exploit code increases the likelihood of targeted attacks. The vulnerability's impact on development toolchains underscores the importance of maintaining secure software supply chains and implementing regular security assessments of all development infrastructure components. From an operational standpoint, organizations should conduct thorough vulnerability assessments to identify all systems running affected versions of GNU Binutils and prioritize remediation efforts accordingly. The ATT&CK framework suggests implementing defensive measures such as process isolation, memory protection mechanisms, and runtime monitoring to detect and prevent exploitation attempts. Additionally, organizations should consider implementing software composition analysis tools to track the presence of vulnerable components and ensure comprehensive coverage of all potential attack surfaces within their infrastructure. The vulnerability's nature as a memory safety issue also necessitates regular code reviews and static analysis of system components to identify similar patterns that could lead to additional vulnerabilities.