Global Buffer Overflow Vulnerability in KMime Package
Summary
OSV-2026-561: Global-buffer-overflow in nameMatch. Affects kmime versions >= 203b456991a1104bb0e3e6ea943b8328aa0b8d08, < 004fa5a8abaf96509350dd6c1aa18029de81697d. Fixed in 004fa5a8abaf96509350dd6c1aa18029de81697d. How to fix ↓
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Background
KMime is a library used for parsing and handling email messages in the KDE ecosystem. It provides functionalities for managing MIME types and headers, allowing applications to process email content effectively. The library is crucial for applications that rely on email communication, making its security paramount. However, KMime has been found to be vulnerable to a global buffer overflow, which can lead to potential exploitation if not addressed.
Vulnerability Detail
The vulnerability identified is a global buffer overflow occurring in the 'nameMatch' function of the KMime library. This issue was reported through OSS-Fuzz, indicating that it can lead to a crash during the parsing of encoded words in email headers. The crash state reveals that the overflow happens during the conversion of QString objects, which can potentially allow attackers to execute arbitrary code or cause denial of service. The vulnerability was introduced in commit 203b456991a1104bb0e3e6ea943b8328aa0b8d08 and has been fixed in commit 004fa5a8abaf96509350dd6c1aa18029de81697d.
How To Fix
Minimum fixed version
004fa5a8abaf96509350dd6c1aa18029de81697d
This is the first release that contains the fix.
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Workaround
As a temporary workaround, users may avoid processing potentially malicious email headers or implement additional validation checks before parsing encoded words. However, this is not a permanent solution and updating the package is strongly advised.
Conclusion
The global buffer overflow vulnerability in the KMime package poses significant risks to applications that rely on it for email processing. It is crucial for users to update to the patched version to ensure the security and stability of their applications. Utilizing tools like Vulert can help in monitoring and managing open-source vulnerabilities effectively.
See every vulnerability recorded for kmime →
FAQ
A global buffer overflow occurs when a program writes more data to a buffer than it can hold, potentially overwriting adjacent memory and leading to unpredictable behavior or security vulnerabilities.
If your application uses the KMime library to process emails, this vulnerability could allow attackers to crash the application or execute arbitrary code, compromising the security of your system.
Yes, a patch has been released in the fixed version of the KMime package. Users are encouraged to update to this version to mitigate the risk.
You can use Vulert, which monitors open-source vulnerabilities in your software. By simply uploading your manifest file like package-lock.json, you can receive real-time alerts about vulnerabilities, including this one.
If an immediate update is not possible, consider implementing input validation to mitigate the risk of exploitation and monitor for any unusual behavior in your application.
References
Related vulnerabilities
Recent vulnerabilities recorded for kmime.
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