CVE-2024-33875

What it actually does

Heap-based buffer overflow in H5O__layout_encode allows out-of-bounds write that corrupts the instruction pointer during HDF5 object layout encoding.

Why it matters to the business

Successful exploitation can lead to arbitrary code execution on systems processing untrusted HDF5 files, risking data exposure, service disruption, and unauthorized access across scientific computing and data analytics environments that depend on the library.

How an attack unfolds

An attacker crafts a specially malformed HDF5 file containing a manipulated object layout structure. When a vulnerable application opens or processes the file, the library's layout encoding routine overflows a heap buffer, overwriting the instruction pointer and enabling the attacker to redirect execution to attacker-controlled code.

How to fix it

Upgrade hdfgroup/hdf5 to the commit 88429b015e29c59de604b0f552001fb7cb7ed5d0 or later. Rebuild and redeploy all dependent applications after the update. Validate the upgrade by confirming the commit hash in the source tree and running regression tests on HDF5 file I/O paths.

How to confirm the fix worked

Inspect the installed library version or source commit against 88429b015e29c59de604b0f552001fb7cb7ed5d0. Exercise file parsing code paths with both valid and boundary-case HDF5 files to confirm absence of crashes or unexpected behavior. Monitor build pipelines to ensure the patched commit is included.

Typical attack path

1. Attacker generates a malicious HDF5 file with oversized or malformed layout metadata.
2. Victim application or script loads the file using the vulnerable HDF5 library version.
3. H5O__layout_encode is invoked during file parsing, triggering the heap overflow.
4. Instruction pointer is corrupted, allowing shellcode or ROP chain execution.
5. Attacker gains code execution within the context of the processing application.

How to detect it

Monitor application logs and crash reports for segmentation faults or access violations originating from HDF5 layout encoding routines. Correlate file-open events with subsequent unexpected process behavior or memory corruption indicators in security tooling.

What your security team should do

• Prioritize upgrade of all HDF5 deployments to the fixed commit within the next maintenance window.
• Inventory applications and pipelines that consume HDF5 files and schedule updates.
• Implement file-type validation and sandboxing for untrusted HDF5 inputs until patches are applied.
• Review and update dependency manifests to prevent reintroduction of vulnerable versions.