Affected: python-pillow Pillow

Pillow is a Python imaging library. From 2.6.0 until 13.0.0, Pillow is vulnerable to argument injection when invoking Ghostscript for EPS input. EpsImagePlugin.Ghostscript passes a caller-controlled input filename after -f without converting it to a safe absolute path, so a name beginning with a hyphen can be interpreted as a Ghostscript option. An attacker who controls the filename can inject Ghostscript arguments. Arbitrary command execution specifically requires a leading @ argument-file filename and control of the referenced text file containing additional Ghostscript arguments; the reported chain reproduces with the default -dSAFER invocation. This issue is fixed in version 13.0.0.

Affected: PyPI: Pillow

### Summary `PIL.EpsImagePlugin.Ghostscript()` builds the Ghostscript command line using the input file path (`fp.name`) **without sanitization**, placing it at `-f <infile>`. A filename beginning with `-` is interpreted by Ghostscript as an option, giving command-line argument injection; chainable to RCE (see Impact). Reproduces with Pillow's default invocation (with `-dSAFER` enabled).

### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._

#### Type CWE-88 (Argument Injection) (→ CWE-78 (OS Command Injection) optionally, with attacker controlled text file)

#### Vulnerable Codes

```python infile_temp = None if hasattr(fp, "name") and os.path.exists(fp.name): infile = fp.name # user-controlled path used as-is, without validation else: in_fd, infile_temp = tempfile.mkstemp() os.close(in_fd) infile = infile_temp # ... (copy fp into a temporary file)

# Build Ghostscript command command = [ gs_binary, "-q", f"-g{width:d}x{height:d}", f"-r{res_x:f}x{res_y:f}", "-dBATCH", "-dNOPAUSE", "-dSAFER", # default sandbox — does NOT stop this injection f"-sDEVICE={device}", f"-sOutputFile={outfile}", "-c", f"{-bbox[0]} {-bbox[1]} translate", "-f", infile, # injected here: inserted into argv with no check for # option prefi…