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GHSA-VJGJ-42F6-7997: GHSA-vjgj-42f6-7997: Protection Mechanism Failure via Incomplete Seccomp Sandbox in Netfoil

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GHSA-vjgj-42f6-7997: Protection Mechanism Failure via Incomplete Seccomp Sandbox in Netfoil

Vulnerability ID: GHSA-VJGJ-42F6-7997
CVSS Score: 6.0
Published: 2026-04-29

Netfoil versions prior to v0.2.1 suffer from a protection mechanism failure where the optional seccomp sandbox causes the application to crash or fails to apply due to an incomplete system call whitelist. This flaw neutralizes the intended defense-in-depth mechanisms, leaving the application with standard runtime privileges.

TL;DR

Netfoil's --filter-system-calls feature fails to apply correctly due to a missing SYS_RT_SIGACTION syscall in its seccomp whitelist, leading to application crashes or sandbox bypass. This issue is resolved in version 0.2.1.

Technical Details

  • Vulnerability Class: Protection Mechanism Failure (CWE-693)
  • Attack Vector: Local (Configuration-dependent)
  • CVSS Base Score: 6.0 (Medium)
  • Impact: Defense Evasion / Denial of Service
  • Exploit Status: None (No exploit required)
  • Component: netfoil/seccomp filter

Affected Systems

  • Linux systems running Netfoil with the --filter-system-calls flag
  • netfoil: < v0.2.1 (Fixed in: v0.2.1)

Code Analysis

Commit: 8c84f1b

Add missing unix.SYS_RT_SIGACTION syscall to applySystemCallFilter whitelist

Mitigation Strategies

  • Software Update
  • Configuration Modification

Remediation Steps:

  1. Identify all deployments of Netfoil running versions prior to v0.2.1.
  2. Download the patched binary for version v0.2.1 from the official GitHub releases page or rebuild from the repository's main branch.
  3. Replace the existing binary with the updated version and restart the service.
  4. If patching is not possible, disable the seccomp sandbox by removing the --filter-system-calls argument from the application's execution command.

References

Read the full report for GHSA-VJGJ-42F6-7997 on our website for more details including interactive diagrams and full exploit analysis.

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