CVE-2025-3198: GNU Binutils Information Disclosure Bug

CVE-2025-3198 Overview

A memory leak vulnerability has been identified in GNU Binutils versions 2.43 and 2.44, specifically affecting the display_info function within the binutils/bucomm.c file of the objdump component. This vulnerability is classified as CWE-401 (Missing Release of Memory after Effective Lifetime), where allocated memory is not properly freed after use, potentially leading to resource exhaustion.

Critical Impact

Local attackers with limited privileges can exploit this vulnerability to cause denial of service conditions through memory exhaustion by repeatedly triggering the memory leak in objdump operations.

Affected Products

• GNU Binutils 2.43
• GNU Binutils 2.44

Discovery Timeline

• 2025-04-04 - CVE-2025-3198 published to NVD
• 2025-05-15 - Last updated in NVD database

Technical Details for CVE-2025-3198

Vulnerability Analysis

The vulnerability resides in the display_info function located in binutils/bucomm.c, a core utility file used by the objdump binary analysis tool. When objdump processes certain binary files, the display_info function allocates memory to store and display binary metadata. However, the implementation fails to properly release this allocated memory under specific code paths, resulting in a memory leak.

This vulnerability requires local access to exploit, meaning an attacker must have the ability to execute objdump on the target system. While the impact is limited to availability (memory exhaustion leading to denial of service), repeated exploitation could degrade system performance or cause crashes in environments where objdump is used extensively, such as build systems, reverse engineering workstations, or automated analysis pipelines.

Root Cause

The root cause is a missing memory release operation in the display_info function within binutils/bucomm.c. The function allocates memory to handle binary information display tasks but fails to free this memory before returning or when specific execution paths are taken. This missing deallocation constitutes CWE-401 (Missing Release of Memory after Effective Lifetime), allowing memory to accumulate over successive operations.

Attack Vector

The attack requires local access with low privileges. An attacker with the ability to execute objdump commands can craft or provide malicious binary files that trigger the vulnerable code path repeatedly. Each invocation causes a small amount of memory to leak, and through sustained or automated execution, this can exhaust available system memory.

The exploit has been disclosed publicly, and the vulnerable code path is well-documented in the Sourceware Bug Report #32716. Attackers could target systems running continuous integration pipelines, automated binary analysis tools, or development environments where objdump is invoked frequently.

Detection Methods for CVE-2025-3198

Indicators of Compromise

• Unusual memory consumption growth in processes running objdump
• System memory exhaustion or out-of-memory (OOM) events correlated with objdump activity
• Repeated or automated execution of objdump against numerous or crafted binary files
• Process crashes or degraded system performance on build servers or analysis workstations

Detection Strategies

• Monitor memory usage patterns for objdump processes, flagging abnormal growth over time
• Implement process accounting to track objdump invocations and correlate with system resource consumption
• Use memory profiling tools (e.g., Valgrind, AddressSanitizer) in development and testing environments to detect leaks
• Alert on OOM killer events where objdump or related binutils processes are terminated

Monitoring Recommendations

• Configure system monitoring to track per-process memory consumption for binutils components
• Set up alerts for memory usage exceeding baseline thresholds on systems running automated binary analysis
• Review logs from build systems and CI/CD pipelines for objdump-related errors or crashes
• Periodically audit installed binutils versions to ensure patched versions are deployed

How to Mitigate CVE-2025-3198

Immediate Actions Required

• Update GNU Binutils to a patched version that includes commit ba6ad3a18cb26b79e0e3b84c39f707535bbc344d
• Verify installed binutils version using objdump --version and compare against affected versions 2.43 and 2.44
• Limit objdump usage to trusted users and restrict execution in automated pipelines until patched
• Monitor system memory on hosts running affected versions as a temporary detection measure

Patch Information

The vulnerability has been addressed in the GNU Binutils source repository. The patch is identified by Git commit hash ba6ad3a18cb26b79e0e3b84c39f707535bbc344d. Organizations should obtain updated binutils packages from their distribution vendor or compile from the patched source.

For technical details on the fix, refer to the Sourceware Git Commit Reference. Additional context is available in the Sourceware Bug Report #32716.

Workarounds

• Limit access to objdump execution on production and shared systems to reduce attack surface
• Implement resource limits (e.g., using ulimit or cgroups) to cap memory consumption for objdump processes
• Avoid processing untrusted or unknown binary files with affected objdump versions
• Consider using containerization to isolate binary analysis tasks and limit resource impact

# Example: Apply memory limits to objdump execution
# Set memory limit to 512MB for the current shell session
ulimit -v 524288

# Alternative: Use cgroups to limit memory for analysis processes
# Create a memory-limited cgroup (requires root)
cgcreate -g memory:/binutils_analysis
echo 536870912 > /sys/fs/cgroup/memory/binutils_analysis/memory.limit_in_bytes

# Run objdump within the cgroup
cgexec -g memory:binutils_analysis objdump -d target_binary