CynepMyx

GitHub · Repository owner · Source ID 82723085
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Source-scoped identity with 1 associated PoC and 1 linked vulnerability.

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CynepMyx/nginx-rift-check

Repository PoC0Created 2026-08-13ScannerCVE-2026-429457 files

37.5 KiB

GitHubPoC details
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A Python script that parses nginx configuration dumps to detect patterns vulnerable to CVE-2026-42945. It identifies specific directive pairs (rewrite with '?' in replacement followed by an unnamed capture like $1) and reports findings without exploiting the vulnerability.

Backdoor review

No backdoor observed in reviewed code

The repository contains a Python script (payload withheld) and its documentation (payload withheld) designed to detect nginx configurations vulnerable to CVE-2026-42945. The script parses nginx configuration dumps, identifies a specific pattern of 'rewrite' and subsequent directives using unnamed captures, and reports findings. No backdoor, deceptive payload, or concealed harmful behavior was observed. The code's functionality is fully disclosed and aligns with its stated purpose.

ClassificationScanner
Model confidence95%
AuthenticationNot required
LanguagesPython
Target softwarenginx
Attack typesheap buffer overflow
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The artifact is a configuration scanner that detects vulnerable directive patterns for CVE-2026-42945. It does not send crafted HTTP requests, trigger the overflow, or execute any exploit code; it only analyzes static configuration text and reports findings.

README.md:3-5check_rewrite.py:1-12

Requirements

  • Requires an nginx configuration dump (e.g., from 'nginx -T') as input.README.md:46-48

Observed behavior

  • Parses nginx configuration text to identify location blocks containing a 'rewrite' directive with a '?' followed by arguments, and a subsequent directive using an unnamed capture ($1-$9).check_rewrite.py:197-282
  • Reports findings with location, rewrite, and consumer directive details, along with confidence levels (high/low).check_rewrite.py:398-424
  • Exits with code 0 if no vulnerable pattern found, 1 if found, 2 if parsing fails.check_rewrite.py:496-499
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

File
Payload withheldThe main analysis script. It reads nginx configuration text, parses it for a specific vulnerability pattern, and outputs findings to stdout or as JSON. It does not make network connections, execute external commands, or write files.check_rewrite.py:1-503
File
Payload withheldDocumentation for the tool, explaining the vulnerability, detection logic, usage, and limitations. It matches the behavior implemented in the script.README.md:1-92
Review boundaries

What the analysis did not establish

  • Only two text files (payload withheld, payload withheld) from the repository are included; five other files are omitted, so the full repository content is not available for review.
  • The evidence packet reports complete_artifact_coverage as false, indicating not all repository files were analyzed.
  • Five files from the repository were not included in the text evidence, but their metadata indicates they are test files and sample configurations, which are unlikely to contain backdoor logic.
  • The analysis is limited to the provided text; any behavior in uninspected binary files (none reported) or external dependencies (none used) is not assessed.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.