CVE-2021-46878

Summary

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.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

References

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

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