CVE-2019-8354

What it actually does

Integer overflow during multiplication passed to malloc in lsx_make_lpf results in allocation of a buffer smaller than required, enabling subsequent out-of-bounds writes on the heap.

Why it matters to the business

Systems that process untrusted audio files may experience crashes or unexpected behavior, interrupting media workflows and requiring emergency patching or workarounds.

How an attack unfolds

An attacker supplies a specially crafted audio file or effect parameter to the vulnerable SoX binary; when the low-pass filter code path executes, the integer overflow produces an undersized heap buffer that is then overwritten during normal processing.

How to fix it

Upgrade SoX to a version containing the corrected lsx_make_lpf implementation; rebuild and redeploy any locally compiled packages; replace affected packages in Debian and Ubuntu distributions with patched builds once available.

How to confirm the fix worked

Run the affected binary against a regression test set containing large filter parameters and confirm absence of crashes or sanitizer violations; verify package versions match known fixed releases; inspect build logs for updated effect_i_dsp.c.

Typical attack path

1. Identify a target system running an affected SoX version that processes user-supplied audio
2. Craft an input file or command-line arguments that reaches lsx_make_lpf with large multiplication operands
3. Trigger allocation of the undersized buffer
4. Perform subsequent writes that corrupt heap metadata or adjacent objects
5. Achieve denial of service or, with additional primitives, arbitrary code execution

How to detect it

Review process execution logs and command-line history for invocations of sox or play with effect flags that exercise i_dsp; examine core dumps or heap sanitizer reports from crashes occurring during audio effect processing; correlate with file-system timestamps of processed audio files.

What your security team should do

• Prioritize patching SoX in any media-processing or build pipelines that accept external audio
• Restrict execution of sox to trusted inputs until updates are applied
• Add SoX to the organization's vulnerability scanning inventory for ongoing monitoring