The vulnerability identified as CVE-2021-33815 affects FFmpeg version 4.4, specifically in the dwa_uncompress function located in libavcodec/exr.c. This vulnerability allows out-of-bounds array access because the dc_count value is not strictly checked. With a CVSS score of 8.8, this vulnerability is classified as high severity due to its potential impact on confidentiality, integrity, and availability.
Risk to organizations includes unauthorized access to sensitive data, potential denial of service, and other integrity issues. Given the network attack vector and low complexity of the attack, this vulnerability poses a significant threat, especially in environments that utilize FFmpeg for media processing.
As of now, there are no known exploits in the wild, but organizations should remain vigilant. The urgency for defenders is high, and organizations should prioritize patching immediately.
The vulnerability was published on June 3, 2021, and has since been modified in the database to reflect ongoing changes in its status.
Vulnerability Details
The official description of the vulnerability states: 'dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.' This vulnerability falls under CWE-129, which pertains to improper validation of array index.
The CVSS score for this vulnerability is 8.8, indicating high severity. The attack vector is network-based, and it requires user interaction, making it crucial for organizations to implement proper security measures. The impacts of this vulnerability are significant, affecting confidentiality, integrity, and availability.
Technical Analysis
The root cause of this vulnerability is rooted in the insufficient validation of the dc_count variable in the dwa_uncompress function. This lack of strict checking leads to potential out-of-bounds access, allowing attackers to exploit this flaw through crafted inputs.
The attack vector is network-based, requiring low complexity to execute, and no privileges are required to exploit this vulnerability. User interaction is necessary, as the attacker must convince a user to run a specially crafted file.
The impacts on confidentiality, integrity, and availability can be severe, rendering systems vulnerable to unauthorized access or denial of service.
Risk & Impact Analysis
The real-world risk posed by CVE-2021-33815 is significant. Organizations using FFmpeg in production environments must be aware of the potential blast radius if this vulnerability is exploited. The ability for attackers to cause denial of service or access sensitive information raises the urgency for immediate remediation.
Given the high CVSS score and the vulnerability's presence in widely-used software, organizations should assess their exposure and prioritize patching in their security cycles. The evaluation of existing security measures and incident response plans should also consider this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version for this vulnerability is FFmpeg 4.4. Organizations using this version should ensure they apply the necessary patches immediately.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to the latest version of FFmpeg. As of now, patches are available that address this issue. Organizations without immediate access to the patch should consider implementing configuration hardening to minimize risk.
For more detailed insights into remediation strategies, organizations can refer to resources on penetration testing that can help validate the effectiveness of their security measures.
Detection Guidance
Organizations should monitor logs for unusual activity related to FFmpeg processing tasks. Behavioral anomalies during media processing and any unauthorized access attempts should be investigated. Additionally, network signatures associated with FFmpeg traffic should be analyzed for potential exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-33815 highlights the importance of rigorous validation checks in software development. This vulnerability represents a pattern of risks associated with improper input handling that can lead to serious consequences.
Security teams should learn from this incident to enhance their validation processes and code review practices. For further insights, organizations can explore topics on penetration testing methodologies that can strengthen their defensive posture. Additionally, understanding vulnerability management programs can aid in a systematic approach to identifying and addressing such vulnerabilities.
Overall, organizations must remain vigilant and proactive in addressing vulnerabilities like CVE-2021-33815 to protect their systems and data.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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