CVE-2020-9728 in InDesign
Summary
by MITRE
A memory corruption vulnerability exists in InDesign 15.1.1 (and earlier versions). Insecure handling of a malicious indd file could be abused to cause an out-of-bounds memory access, potentially resulting in code execution in the context of the current user.
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Analysis
by VulDB Data Team • 05/05/2025
The vulnerability identified as CVE-2020-9728 represents a critical memory corruption flaw within Adobe InDesign version 15.1.1 and earlier iterations. This issue stems from inadequate input validation and memory management when processing maliciously crafted indesign files. The flaw manifests during the parsing of indd file structures where the application fails to properly validate buffer boundaries, leading to potential out-of-bounds memory access conditions. Such vulnerabilities fall under the CWE-121 category of stack-based buffer overflow, though in this case the memory corruption occurs through heap manipulation rather than traditional stack overflow mechanisms. The vulnerability is particularly concerning as it operates within a widely used desktop publishing application that users frequently open without suspicion, creating an ideal attack surface for social engineering campaigns.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious indd file that triggers improper memory handling during document parsing. When the vulnerable InDesign application attempts to process this crafted file, it encounters malformed data structures that cause memory corruption. The out-of-bounds memory access can potentially be leveraged to overwrite critical memory locations, including return addresses or function pointers, which may allow an attacker to redirect execution flow. This type of vulnerability aligns with ATT&CK technique T1203, where adversaries abuse legitimate program functionality to execute malicious code. The memory corruption pattern suggests the application does not properly implement bounds checking mechanisms when handling variable-length data structures within the indd file format, particularly in sections dealing with embedded objects or complex formatting elements.
The operational impact of CVE-2020-9728 extends beyond simple denial of service scenarios, as successful exploitation could enable full code execution with the privileges of the currently logged-in user. This presents a significant risk in enterprise environments where desktop publishing professionals regularly handle documents from external sources, including clients, vendors, or collaborators. The vulnerability's exploitation potential is heightened by the fact that indd files are commonly shared and opened without extensive security screening, making this attack vector particularly attractive to threat actors. Organizations using InDesign for creative workflows face elevated risk, as the application's legitimate use cases involve frequent document exchange, increasing the likelihood of encountering malicious payloads. The vulnerability also impacts the broader Adobe ecosystem, as InDesign users may inadvertently trigger exploitation during normal document handling activities, making detection and prevention particularly challenging.
Mitigation strategies for CVE-2020-9728 should prioritize immediate patching of affected InDesign versions to the latest security updates provided by Adobe. System administrators should implement strict document handling policies that prohibit opening untrusted inddd files, particularly those received from external sources or unknown senders. Network-level controls including email filtering and web proxy configurations can help prevent malicious files from reaching end users. Additionally, implementing application whitelisting solutions that restrict execution of unapproved software versions can provide defense-in-depth measures. Organizations should also consider deploying endpoint detection and response solutions that monitor for suspicious memory access patterns and potential exploitation attempts. The vulnerability's characteristics make it particularly susceptible to sandboxing approaches, where document processing occurs in isolated environments that limit potential damage from successful exploitation attempts. Regular security awareness training for creative professionals about the risks of opening untrusted documents remains essential in preventing social engineering attacks that leverage this vulnerability.