Critical Vulnerability in libexif: Unrestricted Size Handling in Canon EXIF MakerNote Data
Summary
ALPINE-CVE-2020-13114: An issue was discovered in libexif before 0.6.22. Affects libexif versions < 0.6.22-r0. Fixed in 0.6.22-r0. How to fix ↓
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Background
libexif is a library used for reading and writing EXIF (Exchangeable Image File Format) metadata in image files. It is widely utilized in various applications that handle image processing and manipulation. The library's ability to decode EXIF data makes it essential for ensuring that images retain their metadata, which can include camera settings, timestamps, and other important information. However, a vulnerability has been identified that allows for unrestricted size handling of Canon EXIF MakerNote data, potentially leading to significant performance issues.
Vulnerability Detail
An issue was discovered in libexif before version 0.6.22, where an unrestricted size in handling Canon EXIF MakerNote data could lead to excessive consumption of compute resources when decoding EXIF data. This vulnerability can result in denial of service conditions, as the system may become unresponsive due to the high computational load. The vulnerability is classified with a CVSS score of 7.5, indicating a high severity level, and it affects all versions prior to 0.6.22.
How To Fix
Minimum fixed version
0.6.22-r0
This is the first release that contains the fix.
sudo apk add --upgrade libexifTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you may consider limiting the size of the EXIF data being processed or implementing checks to validate the size of the MakerNote data before decoding. However, this is not a permanent solution and updating the library is strongly recommended.
Conclusion
The vulnerability in libexif poses a significant risk due to its potential to cause denial of service through excessive resource consumption. It is crucial for users to update to the patched version 0.6.22-r0 to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor and alert for open-source vulnerabilities in real-time.
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FAQ
libexif is a library for reading and writing EXIF metadata in image files, commonly used in image processing applications.
The vulnerability allows for unrestricted size handling of Canon EXIF MakerNote data, potentially leading to excessive CPU usage and denial of service.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score of this vulnerability is 7.5, indicating a high severity level.
You can update libexif by running the command 'apk add libexif=0.6.22-r0' in your Alpine Linux environment.
References
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