CVE-2016-4009: Integer Overflow in Pillow Allows Heap-based Buffer Overflow

Background

Pillow is a popular Python imaging library that provides support for opening, manipulating, and saving many different image file formats. It is widely used in various applications for image processing and manipulation. However, prior to version 3.1.1, Pillow was vulnerable to an integer overflow in the ImagingResampleHorizontal function in the libImaging/Resample.c file. This vulnerability could be exploited by remote attackers through negative values of the new size parameter, leading to a heap-based buffer overflow.

Vulnerability Detail

The integer overflow vulnerability in Pillow arises from a lack of proper input validation in the ImagingResampleHorizontal function. By providing negative values for the new size parameter, an attacker can trigger a heap-based buffer overflow. This can potentially result in arbitrary code execution or denial of service, depending on how the attacker crafts the exploit. The impact of this vulnerability is unspecified, but it poses a significant risk to systems that utilize Pillow for image processing.

pip install --upgrade "pillow==13.0.0"

pip install --upgrade "pillow==4e0d9b0b9740d258ade40cce248c93777362ac1e"

Workaround

If upgrading to the fixed version is not immediately feasible, a possible workaround is to ensure that only valid and positive values are used for the new size parameter in the ImagingResampleHorizontal function. This can be achieved by implementing input validation checks before calling the function. Below is an example of how this can be done in Python:

# Perform input validation
if new_size <= 0:
    raise ValueError('Invalid new size')

# Call the ImagingResampleHorizontal function with validated input
ImagingResampleHorizontal(image, new_size)

Conclusion

In conclusion, the integer overflow vulnerability in Pillow's ImagingResampleHorizontal function can lead to a heap-based buffer overflow. This can potentially result in arbitrary code execution or denial of service. Users are strongly advised to upgrade to version 3.1.1 or later of Pillow to mitigate the risk. If immediate upgrade is not possible, implementing input validation checks can serve as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.

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