Heap-use-after-free in jsmn_parse in fluent-bit
Summary
OSV-2022-577: Heap-use-after-free in jsmn_parse. Affects fluent-bit across 2 version ranges.
< 2afab38dbfe3cff32c14d0a1ce7e4935bef02729
>= 16567ddbbeee9f2b728876c6790c928176c7f4ce, < 53f2e45291bb798e3bc942d039f9b1596aed50f4
Fixed in 53f2e45291bb798e3bc942d039f9b1596aed50f4. How to fix ↓
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Background
Fluent Bit is an open-source and multi-platform log processor and forwarder that allows you to collect data/logs from different sources, unify them, and send them to multiple destinations. It is designed to be lightweight and efficient, making it suitable for various use cases. However, a vulnerability has been discovered in the jsmn_parse function of fluent-bit, which can lead to a heap-use-after-free issue.
Vulnerability Detail
The vulnerability in fluent-bit arises from a heap-use-after-free issue in the jsmn_parse function. This issue can be triggered when parsing JSON data, potentially leading to a crash or arbitrary code execution. An attacker could exploit this vulnerability by crafting malicious JSON data to trigger the use-after-free condition. The impact of this vulnerability can range from denial-of-service attacks to potential remote code execution.
How To Fix
Minimum fixed version
53f2e45291bb798e3bc942d039f9b1596aed50f4
This is the first release that contains the fix.
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Workaround
As a temporary workaround, you can consider implementing input validation and sanitization for JSON data before passing it to fluent-bit. This can help mitigate the risk of exploitation by preventing the triggering of the use-after-free condition. Here is an example of input validation in Python:
import json
def validate_json(data):
try:
json.loads(data)
return True
except json.JSONDecodeError:
return False
Conclusion
In conclusion, fluent-bit is vulnerable to a heap-use-after-free issue in the jsmn_parse function. This vulnerability can be exploited by crafting malicious JSON data, potentially leading to crashes or arbitrary code execution. It is crucial to update fluent-bit to a version that includes the fix or implement input validation and sanitization as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for fluent-bit →
FAQ
Fluent Bit is an open-source log processor and forwarder that allows you to collect, unify, and send logs from various sources to multiple destinations.
A heap-use-after-free vulnerability occurs when a program continues to use a memory region after it has been freed. This can lead to crashes, memory corruption, and potentially, arbitrary code execution.
An attacker can exploit this vulnerability by crafting malicious JSON data that triggers the use-after-free condition in the jsmn_parse function of fluent-bit. This can potentially lead to a crash or arbitrary code execution.
Yes, this vulnerability has been fixed in fluent-bit. It is recommended to update to a version that includes the fix to ensure the security of your system.
As a temporary workaround, you can implement input validation and sanitization for JSON data before passing it to fluent-bit. This can help mitigate the risk of exploitation by preventing the triggering of the use-after-free condition.
References
Related vulnerabilities
Recent vulnerabilities recorded for fluent-bit.
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