CVE-2021-46878 Information

Description

An issue was discovered in Treasure Data Fluent Bit 1.7.1 erroneous parsing in flb_pack_msgpack_to_json_format leads to type confusion bug that interprets whatever is on the stack as msgpack maps and arrays leading to use-after-free. This can be used by an attacker to craft a specially craft file and trick the victim opening it using the affect software triggering use-after-free and execute arbitrary code on the target system.

Reference

https://github.com/fluent/fluent-bit/pull/3115 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27742