A critical security flaw has been disclosed in the Apache Avro Java Software Development Kit (SDK) that, if successfully exploited, could allow the execution of arbitrary code on susceptible instances.
The flaw, tracked as CVE-2024-47561 (CVSS score: 9.3), impacts all versions of the software prior to 1.11.4.
“Schema parsing in the Java SDK of Apache Avro 1.11.3 and previous versions allows bad actors to execute arbitrary code,” the project maintainers said in an advisory released last week. “Users are recommended to upgrade to version 1.11.4 or 1.12.0, which fix this issue.”
Apache Avro, analogous to Google’s Protocol Buffers (protobuf), is an open-source project that provides a language-neutral data serialization framework for large-scale data processing.
The Avro team notes that the vulnerability affects any application if it allows users to provide their own Avro schemas for parsing. Kostya Kortchinsky from the Databricks security team has been credited with discovering and reporting the security shortcoming.
As mitigations, it’s recommended to sanitize schemas before parsing them and avoid parsing user-provided schemas.
“CVE-2024-47561 affects Apache Avro 1.11.3 and previous versions while de-serializing input received via avroAvro schema,” Mayuresh Dani, Manager, manager of threat research at Qualys, said in a statement shared with The Hacker News.
“Processing such input from a threat actor leads to execution of code. Based on our threat intelligence reporting, no PoC is publicly available, but this vulnerability exists while processing packages via ReflectData and SpecificData directives and can also be exploited via Kafka.”
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A severe security flaw in the Apache Avro Java SDK (CVE-2024-47561) has been discovered, enabling remote code execution on affected systems. With a CVSS score of 9.3, this vulnerability exists in versions prior to 1.11.4. Users are advised to upgrade to version 1.11.4 or 1.12.0 to mitigate the risk. The vulnerability arises from improperly sanitized schemas, and it is crucial to avoid parsing user-provided schemas to prevent potential exploitation.

Apache Avro SDK Remote Code Execution Vulnerability: Mitigation Tips