CVE-2017-5842 Gstreamer CVE debrief

Who should care

Teams running applications or pipelines that parse SMI subtitle files through GStreamer gst-plugins-base, especially desktop media players, transcoders, and any service that ingests untrusted media content.

Technical summary

NVD describes an out-of-bounds write in gst/subparse/samiparse.c, specifically html_context_handle_element, affecting gst-plugins-base versions before 1.10.3. The vulnerable condition is reached while parsing crafted SMI subtitle content. The NVD vector indicates a user-interaction component and high availability impact, consistent with a crash or service interruption rather than a data confidentiality issue.

Defensive priority

Medium. Prioritize remediation if your environment processes untrusted or externally supplied SMI subtitle files; otherwise track as a standard library update during routine maintenance.

Recommended defensive actions

• Update GStreamer gst-plugins-base to version 1.10.3 or later, as referenced in the vendor release notes.
• Inventory products and services that embed or depend on GStreamer subtitle parsing and confirm whether SMI handling is enabled.
• Block or quarantine untrusted SMI subtitle files at ingestion points until patched versions are deployed.
• If immediate upgrade is not possible, reduce exposure by disabling SMI subtitle parsing where operationally feasible.
• Validate vendor-specific advisories and package errata for your distribution (for example Debian, Red Hat, or Gentoo) and apply the corresponding fixed package versions.

Evidence notes

The vulnerability description, affected-version range, CWE-787 classification, and CVSS vector come from the supplied NVD record. The supplied references include vendor release notes for 1.10.3, GNOME issue tracking, Debian and Red Hat advisories, and Openwall mailing list posts that document the fix and downstream remediation. This debrief intentionally stays within the supplied corpus and avoids unsupported claims about exploitability beyond crafted SMI-triggered out-of-bounds write and denial of service.

Official resources