CVE-2022-1920 – This CVE describes an integer overflow vulnerab... (How to Fix)

Q: What is the severity of CVE-2022-1920?

CVE-2022-1920 has a CVSS score of 7.8 (HIGH). This CVE describes an integer overflow vulnerability in the matroskademux element of GStreamer's gst_matroska_demux_add_wvpk_header function. When parsing specially crafted Matroska files, it can lead to heap overwrite and potentially arbitrary code execution. Systems using vulnerable versions of GStreamer for media processing are affected.

📋 TL;DR

This CVE describes an integer overflow vulnerability in the matroskademux element of GStreamer's gst_matroska_demux_add_wvpk_header function. When parsing specially crafted Matroska files, it can lead to heap overwrite and potentially arbitrary code execution. Systems using vulnerable versions of GStreamer for media processing are affected.

💻 Affected Systems

Products:

GStreamer

Versions: GStreamer versions before 1.20.4

Operating Systems: Linux, Unix-like systems, Windows (if GStreamer is installed)

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using GStreamer to parse Matroska files is vulnerable. This includes media players, video editors, and web applications with media processing capabilities.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution with the privileges of the application using GStreamer, potentially leading to full system compromise.

🟠

Likely Case

Application crash (denial of service) or limited memory corruption leading to instability.

🟢

If Mitigated

No impact if patched or if vulnerable component is not exposed to untrusted input.

🌐 Internet-Facing: MEDIUM - Exploitation requires processing malicious media files, which could be delivered via web applications or media servers.

🏢 Internal Only: LOW - Typically requires user interaction to open malicious files or specific media processing workflows.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting a malicious Matroska file that triggers the integer overflow. No public exploit code has been disclosed as of the advisory dates.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: GStreamer 1.20.4 and later

Vendor Advisory: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1226

Restart Required: Yes

Instructions:

1. Update GStreamer to version 1.20.4 or later using your distribution's package manager. 2. For Debian/Ubuntu: sudo apt update && sudo apt upgrade gstreamer1.0. 3. Restart any applications or services using GStreamer.

🔧 Temporary Workarounds

Disable matroskademux element

linux

Prevent use of the vulnerable component by disabling or blacklisting the matroskademux element in GStreamer configuration.

export GST_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/gstreamer-1.0/ (adjust path) and remove or rename libgstmatroska.so

🧯 If You Can't Patch

Restrict processing of untrusted Matroska files by implementing file type validation and sandboxing media processing components.
Use network segmentation to isolate systems running vulnerable GStreamer versions from untrusted networks.

🔍 How to Verify

Check if Vulnerable:

Check GStreamer version with: gst-inspect-1.0 --version. If version is earlier than 1.20.4, the system is vulnerable.

Check Version:

gst-inspect-1.0 --version

Verify Fix Applied:

After patching, verify version is 1.20.4 or later with: gst-inspect-1.0 --version.

📡 Detection & Monitoring

Log Indicators:

Application crashes or abnormal termination logs from processes using GStreamer, especially when processing media files.

Network Indicators:

Unusual outbound connections from media processing applications post-crash.

SIEM Query:

Process: (gst-launch OR media_app) AND Event: (Crash OR Segmentation fault) AND File: (*.mkv OR *.webm)

📊 Metadata

CVE ID: CVE-2022-1920

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-122

Published: July 19, 2022

Last Updated: November 21, 2024

🔗 References

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1226 Exploit,Issue Tracking,Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00001.html Mailing List,Third Party Advisory
https://www.debian.org/security/2022/dsa-5204 Third Party Advisory
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1226 Exploit,Issue Tracking,Patch,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00001.html Mailing List,Third Party Advisory
https://www.debian.org/security/2022/dsa-5204 Third Party Advisory

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