CVE-2017-7585

What it actually does

Stack-based buffer overflow triggered in flac_buffer_copy() within flac.c when processing a malformed FLAC audio stream, leading to memory corruption.

Why it matters to the business

Applications that decode FLAC files may crash, causing denial of service for media processing pipelines, audio tools, and any downstream products that embed the vulnerable library; the issue is old with low exploit likelihood so operational urgency is low.

How an attack unfolds

An attacker crafts a specially malformed FLAC file that overflows the stack buffer inside flac_buffer_copy when the file is opened by any application linking against the vulnerable libsndfile; the overflow can be triggered locally with no authentication or privileges required beyond opening the file.

How to fix it

Upgrade libsndfile to a build containing commit 60b234301adf258786d8b90be5c1d437fc8799e0 or later release 1.0.28; upgrade Bitnami Redmine to version 4.0.9 or newer that bundles a fixed libsndfile.

How to confirm the fix worked

Confirm installed libsndfile version is at least 1.0.28 or contains the referenced commit; attempt to open a known-good test FLAC with the patched library and verify no crash occurs under the same conditions that previously triggered the overflow.

Typical attack path

1. Generate a malicious FLAC file that triggers the buffer overflow in flac_buffer_copy()
2. Deliver the file to a target system via email, download, or shared storage
3. Victim application or service opens the file using the vulnerable libsndfile library
4. Overflow occurs resulting in application crash or denial of service

How to detect it

Monitor application logs and crash reports for segmentation faults or stack corruption when processing FLAC files; look for repeated crashes in processes that call into libsndfile flac handling routines.

• flac_buffer_copy
• flac.c

What your security team should do

• Inventory all systems and containers that include libsndfile or Bitnami Redmine and prioritize patching those reachable by untrusted audio files
• Update to the exact fixed versions listed (libsndfile commit 60b2343 or Redmine 4.0.9)
• Add FLAC file sanitization or sandboxing for any high-risk media ingestion workflows until patches are applied