sivaadityacoder opened a new issue, #49955: URL: https://github.com/apache/arrow/issues/49955
### Describe the bug, including details regarding any error messages, version, and platform. An uncontrolled memory allocation vulnerability exists in the Parquet `DeltaByteArrayDecoder`, `DeltaLengthByteArrayDecoder`, and `DeltaBitPackDecoder`. Currently, these decoders trust the `num_values` (and implicitly the `total_value_count_`) provided by the Parquet data page header. The decoders eagerly allocate memory arrays sized proportionally to this unvalidated count (`e.g. buffered_prefix_length_->Resize(num_prefix * sizeof(int32_t))`). An attacker can exploit this by crafting a tiny Parquet file (e.g., ~300 bytes) with a maliciously forged `num_values` (e.g., `1,000,000,000`). When this file is opened, Arrow attempts an immediate massive allocation (e.g., 4 GB), resulting in a `std::bad_alloc` and an immediate Denial of Service (OOM) crash. *(Note: This vulnerability was originally submitted to the Huntr bug bounty platform (Reference ID: 7814255d-e945-427f-ab84-6eddc3a35a37), and is being filed here at the recommendation of the ASF Security Team and Andrew Lamb).* -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
