7alen7/CVE-2026-48813-POC

GitHubRepository PoCExploit

PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A bash script that creates a directory containing a C file with a maliciously crafted filename. The filename includes ANSI escape sequences designed to overwrite terminal output when flawfinder scans the directory, hiding genuine vulnerability findings and displaying a forged 'no security issues found' message.

Backdoor review

No backdoor observed in reviewed code

The artifact is a proof-of-concept (PoC) for CVE-2026-48813, demonstrating how attacker-controlled filenames containing terminal escape sequences can visually deceive a developer running flawfinder. The supplied text files (POC.sh and README.md) describe and implement a benign demonstration: they create a file with a crafted name that, when flawfinder scans it, causes the terminal to display a forged 'no security issues found' message, hiding the real flawfinder output. The PoC does not execute any backdoor, install persistence, exfiltrate data, or deliver a malicious payload. The README explicitly states the PoC is for visual deception only and that no code execution occurs. The shell script is transparent and performs only file creation and informational echo statements. No concealed, obfuscated, or operator-directed harmful behavior is present.

ClassificationExploit
Model confidence95%
AuthenticationNot required
Languagesbash
Target softwareflawfinder
Attack typesterminal escape injection
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The script actively constructs a malicious artifact (a filename with escape sequences) and a vulnerable C file, then instructs the user to execute flawfinder to trigger the injection. This constitutes an exploit because it exercises the vulnerability to produce a deceptive output, not merely detecting or reporting it.

POC.sh:2POC.sh:35POC.sh:55

Requirements

  • The victim must run flawfinder in a directory containing the attacker-crafted filename.POC.sh:5-6
  • The victim's terminal must interpret ANSI escape sequences (e.g., libvte-based).README.md:2

Observed behavior

  • Creates a file with a name containing ANSI escape sequences (ESC, CR, BEL) that clear the line, move the cursor, and print a forged success message.POC.sh:24-35
  • Writes C code with a known vulnerability (strcpy buffer overflow) into the maliciously-named file.POC.sh:41-47
  • Instructs the user to run flawfinder on the crafted directory, which will display the forged output instead of the real findings.POC.sh:55
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Terminal Escape Sequence Injection
ESC[0mCRESC[2KESC[32m[OK] flawfinder: no security issues foundESC[0mESC[8mThe PoC constructs a filename containing ANSI escape sequences to overwrite terminal output and display a forged message, demonstrating the claimed vulnerability.POC.sh:35
Review boundaries

What the analysis did not establish

  • The evidence does not include the output of executing the script or flawfinder; the described behavior is based solely on the script's code and documentation.
  • The README references images that are not included in the text evidence, so the visual walkthrough cannot be verified.
  • No binary files were present for analysis.
  • The review is limited to the supplied text; the actual behavior of flawfinder or the terminal when processing the crafted filename is not observed.
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.

Linked vulnerabilities

1