CVE-2021-3522 Overview
CVE-2021-3522 is an out-of-bounds read vulnerability affecting GStreamer, the popular open-source multimedia framework. The vulnerability occurs when GStreamer processes certain malformed ID3v2 tags embedded within media files. An attacker can craft a specially designed media file that, when processed by an application utilizing GStreamer, triggers an out-of-bounds memory read operation, potentially leading to application crashes and denial of service conditions.
Critical Impact
Maliciously crafted media files containing ID3v2 tags can cause applications using GStreamer to crash, resulting in denial of service. This vulnerability requires user interaction to open the malicious file.
Affected Products
- GStreamer Project GStreamer (versions before 1.18.4)
- NetApp Active IQ Unified Manager
- NetApp E-Series SANtricity OS Controller
- NetApp E-Series SANtricity Storage Manager
- NetApp E-Series SANtricity Web Services
- NetApp HCI Management Node
- NetApp OnCommand Insight
- NetApp OnCommand Workflow Automation
- NetApp SANtricity Unified Manager
- NetApp SnapManager
- NetApp SolidFire
- Oracle OpenJDK 8 Update 301
Discovery Timeline
- 2021-06-02 - CVE-2021-3522 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2021-3522
Vulnerability Analysis
This vulnerability is classified as CWE-125: Out-of-Bounds Read. When GStreamer parses ID3v2 tags within multimedia files, insufficient bounds checking allows the parser to read memory beyond the allocated buffer boundaries. The vulnerability requires local access and user interaction—specifically, the victim must open a maliciously crafted media file using an application that relies on GStreamer for multimedia processing.
The impact is primarily to availability, as successful exploitation leads to application crashes. While confidentiality and integrity are not directly compromised, the denial of service condition can disrupt multimedia applications, streaming services, and other software dependent on GStreamer for media handling.
Root Cause
The root cause lies in improper input validation within GStreamer's ID3v2 tag parsing implementation. ID3v2 is a metadata container format commonly used in MP3 files and other media formats to store information such as artist names, album titles, and track information. When processing malformed ID3v2 tag structures, the parser fails to properly validate the size fields and boundary conditions before reading tag data.
This oversight allows an attacker to specify size values that exceed the actual buffer allocation, causing the parser to read beyond the intended memory boundaries. The out-of-bounds read can access adjacent memory regions, potentially causing segmentation faults or other memory access violations that terminate the application.
Attack Vector
The attack requires local access and user interaction. An attacker must convince a user to open a specially crafted media file (such as an MP3 or other audio/video file) that contains malformed ID3v2 metadata tags. When the victim opens this file using any application that utilizes GStreamer for media processing—including popular media players, video editors, and streaming applications—the vulnerable parsing code is triggered.
The attack scenario involves:
- Attacker creates a media file with specially crafted ID3v2 tags containing malformed size fields
- Attacker distributes the malicious file via email attachments, downloads, or shared storage
- Victim opens the file with a GStreamer-based application
- GStreamer attempts to parse the ID3v2 tags and encounters the malformed data
- Out-of-bounds memory read occurs, causing application crash
The exploitation does not require elevated privileges on the target system, making it accessible to low-privilege attackers who can deliver the malicious file to potential victims.
Detection Methods for CVE-2021-3522
Indicators of Compromise
- Application crashes in GStreamer-based media applications when opening specific media files
- Segmentation fault errors or memory access violations in system logs related to GStreamer processes
- Unusual media files with corrupted or malformed ID3v2 tag structures
- Repeated crashes of media players or multimedia processing services
Detection Strategies
- Monitor application crash logs for GStreamer library references and ID3v2 parsing errors
- Implement file integrity monitoring for media file repositories to detect potentially malicious uploads
- Deploy endpoint detection solutions capable of identifying malformed media file structures
- Review system logs for patterns of crashes coinciding with media file access events
Monitoring Recommendations
- Configure crash reporting systems to alert on GStreamer-related application failures
- Monitor system stability metrics for processes utilizing GStreamer libraries
- Implement network monitoring for unusual media file transfers that may indicate distribution of exploit files
- Track GStreamer package versions across systems to identify unpatched installations
How to Mitigate CVE-2021-3522
Immediate Actions Required
- Update GStreamer to version 1.18.4 or later across all affected systems
- Review and update NetApp products according to the NetApp Security Advisory
- Apply Oracle patches as outlined in the Oracle Critical Patch Update October 2021
- Audit systems for vulnerable GStreamer versions using package management tools
Patch Information
The vulnerability is fixed in GStreamer version 1.18.4 and later. Organizations should prioritize updating GStreamer packages through their distribution's package manager or by compiling from source.
For detailed patch and security information, refer to:
Workarounds
- Restrict user access to untrusted media files until patches can be applied
- Implement application sandboxing for media player applications to limit crash impact
- Configure email and download filtering to scan media files for known malicious patterns
- Educate users about the risks of opening media files from untrusted sources
# Check GStreamer version on Linux systems
gst-launch-1.0 --version
# Update GStreamer on Debian/Ubuntu systems
sudo apt update && sudo apt upgrade gstreamer1.0-*
# Update GStreamer on RHEL/CentOS systems
sudo yum update gstreamer1*
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
