Heap Buffer Overflow Vulnerability in Janet Package
Summary
OSV-2026-1309: Heap-buffer-overflow in janet_bytecode_movopt_basic_block. Affects janet versions >= c29050eeda52d117095d2551b7abcf2e98cc9574, < d763d0d51afddceeb251bc6dd6e9458cc4ec0484. Fixed in d763d0d51afddceeb251bc6dd6e9458cc4ec0484. How to fix ↓
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Background
Janet is a functional programming language designed for simplicity and ease of use. It allows developers to write efficient and expressive code. However, like many programming languages, Janet is susceptible to vulnerabilities that can compromise its stability and security. The specific vulnerability in question relates to a heap buffer overflow that can occur during the optimization of bytecode, potentially leading to crashes or exploitation.
Vulnerability Detail
The vulnerability identified as a heap buffer overflow occurs in the function 'janet_bytecode_movopt_basic_block'. This issue was reported through OSS-Fuzz, indicating that it can lead to a crash when the program attempts to read beyond the allocated memory. The potential ramifications include application crashes and possible exploitation by malicious actors if the vulnerability is triggered in a production environment. The vulnerability was introduced in commit 'c29050eeda52d117095d2551b7abcf2e98cc9574' and has been fixed in commit 'd763d0d51afddceeb251bc6dd6e9458cc4ec0484'.
How To Fix
Minimum fixed version
d763d0d51afddceeb251bc6dd6e9458cc4ec0484
This is the first release that contains the fix.
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Workaround
As a temporary workaround, you may avoid using the specific bytecode optimization functions until the package is updated. This can help mitigate the risk of encountering the buffer overflow issue while you prepare for the update.
Conclusion
The heap buffer overflow vulnerability in the Janet package poses significant risks, including application crashes and potential exploitation. It is crucial for developers using Janet to update to the fixed version to ensure the security and stability of their applications. Utilizing tools like Vulert can help monitor for such vulnerabilities effectively.
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FAQ
A heap buffer overflow occurs when a program writes more data to a buffer located on the heap than it can hold, which can lead to memory corruption and crashes.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
The consequences can include application crashes, data corruption, and potential exploitation by attackers, leading to unauthorized access or control over the application.
Yes, the fixed version of Janet is identified as 'd763d0d51afddceeb251bc6dd6e9458cc4ec0484'. It is recommended to update to this version to mitigate the vulnerability.
If immediate updating is not possible, consider implementing the suggested workaround by avoiding the use of the affected bytecode optimization functions until you can apply the update.
References
Related vulnerabilities
Recent vulnerabilities recorded for janet.
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