CVE-2021-40773 in Prelude
Summary
by MITRE • 11/22/2021
Adobe Prelude version 10.1 (and earlier) is affected by a null pointer dereference vulnerability when parsing a specially crafted file. An unauthenticated attacker could leverage this vulnerability to achieve an application denial-of-service in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 11/25/2021
Adobe Prelude version 10.1 and earlier versions contain a critical null pointer dereference vulnerability that stems from inadequate input validation during file parsing operations. This flaw resides in the application's handling of malformed or specially crafted files that trigger unexpected behavior when the software attempts to access memory locations that have not been properly initialized. The vulnerability manifests as a denial-of-service condition where the application crashes or becomes unresponsive when processing malicious input, effectively rendering the software unavailable to legitimate users. The issue is classified under CWE-476 which specifically addresses null pointer dereference conditions that can lead to application instability and system disruptions. From an operational perspective this vulnerability represents a significant risk to media production environments where Adobe Prelude is commonly used for video editing and post-production workflows, as it can be exploited through social engineering tactics to deliver malicious files that appear legitimate to end users. The attack requires user interaction since victims must open the malicious file, making it a client-side exploitation vector that aligns with ATT&CK technique T1203 for legitimate user interaction and T1059 for execution through user interaction.
The technical implementation of this vulnerability occurs when the Prelude application attempts to parse a specially crafted file that contains malformed data structures or unexpected metadata sequences. During the parsing process, the software fails to properly validate pointer references before attempting to dereference them, resulting in a segmentation fault or access violation that terminates the application process. This type of vulnerability is particularly concerning in professional media applications where users frequently open files from various sources, making the attack surface broad and potentially persistent across multiple user sessions. The exploitation mechanism relies on the application's failure to implement proper error handling and input sanitization, which are fundamental security practices that should be implemented at the parsing layer to prevent such conditions. The null pointer dereference represents a classic software bug that can be systematically prevented through proper defensive programming practices and comprehensive input validation routines.
The operational impact of CVE-2021-40773 extends beyond simple application crashes to potentially disrupt critical production workflows in creative industries where Adobe Prelude serves as a core component of video editing pipelines. Organizations using affected versions may experience significant downtime during critical project phases, as the vulnerability can be triggered through various file formats that Prelude supports including common video and audio container types. The vulnerability's requirement for user interaction creates a social engineering component that makes it particularly dangerous in enterprise environments where users may inadvertently open malicious files from email attachments, shared network drives, or downloaded content from untrusted sources. Security teams must consider the broader implications of this vulnerability within their incident response procedures, as it may require immediate patching of multiple endpoints and could potentially be leveraged as a precursor to more sophisticated attacks that target the underlying operating system or network infrastructure.
Mitigation strategies for this vulnerability should include immediate deployment of Adobe's security patches and updates, which address the root cause by implementing proper null pointer validation and error handling mechanisms within the file parsing routines. Organizations should also implement robust file validation policies that include sandboxing or preliminary scanning of files before opening them in production environments. Network-level controls such as email filtering and web proxies can help reduce the likelihood of users encountering malicious files through automated delivery mechanisms. Additionally, security awareness training should emphasize the importance of verifying file sources and avoiding opening suspicious attachments or downloading content from untrusted websites. The vulnerability demonstrates the importance of defense-in-depth strategies where multiple layers of security controls work together to prevent exploitation even when individual controls may be bypassed, aligning with ATT&CK tactic T1046 for network service scanning and T1566 for credential access through social engineering. Regular security assessments of media production environments should include verification of software patch levels and implementation of automated patch management systems to ensure timely remediation of similar vulnerabilities.