Critical Integer Underflow Vulnerability in libexif: Potential for Remote Code Execution
Summary
ALPINE-CVE-2012-2841: Integer underflow in the exif_entry_get_value function in exif-entry.c in the EXIF Tag Parsing Library (aka libexif) 0.6.20 might allow remote attackers to execute arbitrary code via vectors involving a crafted buffer-si... Affects libexif versions < 0.6.21-r0. Fixed in 0.6.21-r0. How to fix ↓
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Background
libexif is an open-source library used for parsing EXIF (Exchangeable Image File Format) tags in image files. It is widely utilized in various applications to handle metadata associated with images. The library provides functionalities to read and write EXIF data, making it essential for applications that manage image files. However, a critical vulnerability has been identified in versions prior to 0.6.21-r0, which could allow attackers to exploit the library's handling of buffer sizes.
Vulnerability Detail
The vulnerability arises from an integer underflow in the exif_entry_get_value function located in exif-entry.c of libexif version 0.6.20. This flaw can be exploited by remote attackers who craft a malicious buffer-size parameter during the formatting of an EXIF tag. The result is a heap-based buffer overflow, which could lead to arbitrary code execution on the affected system. This vulnerability poses significant risks, especially in applications that process untrusted image files.
How To Fix
Minimum fixed version
0.6.21-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 to ensure that buffer sizes are checked before processing EXIF tags. This can help mitigate the risk of exploitation until the package is updated.
Conclusion
The integer underflow vulnerability in libexif poses a serious risk to applications that utilize this library for handling EXIF data. It is essential to update to the patched version 0.6.21-r0 to mitigate the risk of exploitation. Additionally, implementing input validation can serve as a temporary measure until the update is applied.
See every vulnerability recorded for libexif →
FAQ
The vulnerability is an integer underflow that can lead to a heap-based buffer overflow, allowing remote code execution.
Versions of libexif prior to 0.6.21-r0 are affected by this vulnerability.
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Implement input validation to check buffer sizes before processing EXIF tags as a temporary workaround.
Exploitation of this vulnerability could allow attackers to execute arbitrary code, potentially compromising the affected system.
References
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