Out of Bounds Read Vulnerability in libexif: Local Information Disclosure Risk
Summary
ALPINE-CVE-2020-0093: In exif_data_save_data_entry of exif-data.c, there is a possible out of bounds read due to a missing bounds check. 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 commonly utilized in applications that handle image processing and manipulation. The library provides functionalities to extract and modify metadata, which is crucial for managing image attributes. However, a vulnerability has been identified that could potentially expose sensitive information due to inadequate bounds checking.
Vulnerability Detail
The vulnerability arises in the function exif_data_save_data_entry within the exif-data.c file, where a missing bounds check can lead to an out of bounds read. This flaw allows an attacker to access memory locations that they should not have access to, resulting in local information disclosure. The exploitation of this vulnerability requires user interaction, making it a potential risk in scenarios where users handle untrusted image files. The CVSS score for this vulnerability is 5.0, indicating a moderate severity level.
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, users should avoid opening untrusted image files that may contain EXIF data until the package is updated. Additionally, consider implementing stricter input validation in applications that utilize libexif to mitigate the risk of exploitation.
Conclusion
The identified out of bounds read vulnerability in libexif poses a risk of local information disclosure. Users are advised to update to the patched version 0.6.22-r0 to mitigate this risk. Until the update is applied, caution should be exercised when handling image files containing EXIF data.
See every vulnerability recorded for libexif →
FAQ
libexif is a library designed for reading and writing EXIF metadata in image files, commonly used in image processing applications.
The vulnerability allows for an out of bounds read due to a missing bounds check, potentially leading to local information disclosure.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for this vulnerability is 5.0, indicating a moderate severity level.
If immediate updates are not possible, avoid opening untrusted image files and implement stricter input validation in your applications.
References
Related vulnerabilities
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