Buffer Over-Read Vulnerability in libexif: Information Disclosure Risk
Summary
ALPINE-CVE-2020-13112: 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 applications that handle image processing and manipulation. The library provides functionalities to extract metadata from images, which can include camera settings, timestamps, and other relevant information. However, prior to version 0.6.22, libexif was found to have vulnerabilities that could lead to buffer over-reads, potentially exposing sensitive information.
Vulnerability Detail
An issue was discovered in libexif before version 0.6.22. Several buffer over-reads in EXIF MakerNote handling could lead to information disclosure and crashes. This vulnerability arises from improper handling of certain metadata fields, allowing attackers to exploit the library's functionality to read beyond allocated memory buffers. The ramifications include potential exposure of sensitive data and application crashes, which could disrupt services relying on the library. This vulnerability is distinct from CVE-2020-0093, indicating a separate issue that requires attention.
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
If immediate updating is not feasible, consider implementing input validation and sanitization for EXIF data before processing it. This can help mitigate the risk of buffer over-reads by ensuring that only valid and expected data is handled by the application.
Conclusion
The buffer over-read vulnerability in libexif poses significant risks, including information disclosure and application crashes. It is crucial for users of the library to update to the latest version to protect against these vulnerabilities. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time, ensuring the security of your applications.
See every vulnerability recorded for libexif →
FAQ
The CVSS score of this vulnerability is 9.1, indicating a high severity level.
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The potential impacts include information disclosure and application crashes, which can disrupt services that rely on libexif.
Yes, the fix is to update libexif to version 0.6.22-r0 or later.
If immediate updating is not possible, implement input validation and sanitization for EXIF data to mitigate risks.
References
Related vulnerabilities
Recent vulnerabilities recorded for libexif.
