CVE-2016-4098 in Acrobat Reader
Summary
by MITRE
Adobe Reader and Acrobat before 11.0.16, Acrobat and Acrobat Reader DC Classic before 15.006.30172, and Acrobat and Acrobat Reader DC Continuous before 15.016.20039 on Windows and OS X allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2016-1037, CVE-2016-1063, CVE-2016-1064, CVE-2016-1071, CVE-2016-1072, CVE-2016-1073, CVE-2016-1074, CVE-2016-1076, CVE-2016-1077, CVE-2016-1078, CVE-2016-1080, CVE-2016-1081, CVE-2016-1082, CVE-2016-1083, CVE-2016-1084, CVE-2016-1085, CVE-2016-1086, CVE-2016-1088, CVE-2016-1093, CVE-2016-1095, CVE-2016-1116, CVE-2016-1118, CVE-2016-1119, CVE-2016-1120, CVE-2016-1123, CVE-2016-1124, CVE-2016-1125, CVE-2016-1126, CVE-2016-1127, CVE-2016-1128, CVE-2016-1129, CVE-2016-1130, CVE-2016-4088, CVE-2016-4089, CVE-2016-4090, CVE-2016-4093, CVE-2016-4094, CVE-2016-4096, CVE-2016-4097, CVE-2016-4099, CVE-2016-4100, CVE-2016-4101, CVE-2016-4103, CVE-2016-4104, and CVE-2016-4105.
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Analysis
by VulDB Data Team • 10/23/2024
Adobe Reader and Acrobat products have long been prime targets for cyber adversaries due to their widespread deployment and the complex nature of PDF processing. This particular vulnerability CVE-2016-4098 represents a critical memory corruption flaw that affects multiple versions of Adobe's flagship software across different operating systems. The vulnerability exists within the core processing engine responsible for parsing and rendering PDF documents, making it particularly dangerous as it can be triggered through seemingly benign document interactions. Unlike other vulnerabilities in the same timeframe that were specifically related to JavaScript execution or specific PDF object handling, CVE-2016-4098 operates at a deeper memory management level, creating opportunities for attackers to gain arbitrary code execution privileges. The vulnerability's classification under CWE-125 indicates it involves an out-of-bounds read condition that can lead to memory corruption, which aligns with the described execution capabilities and denial of service potential. Attackers exploiting this flaw could potentially leverage it through crafted PDF files delivered via phishing campaigns, malicious websites, or compromised email attachments, making it a significant concern for enterprise environments where PDF documents are frequently processed.
The technical implementation of this vulnerability stems from improper memory handling during PDF document parsing operations, particularly when processing certain malformed or specially crafted PDF objects. When Adobe Reader or Acrobat encounters specific sequences of data within PDF files, the memory management routines fail to properly validate input boundaries, leading to buffer overflows or underflows that can be manipulated to overwrite critical memory regions. This memory corruption can result in either complete system compromise through arbitrary code execution or denial of service conditions that prevent legitimate document processing. The attack surface is broad given that the vulnerability affects both Windows and OS X platforms, indicating the flaw exists in cross-platform code components. From an operational perspective, this vulnerability represents a significant risk to organizations relying on Adobe Reader for document processing, as it can be exploited without requiring user interaction beyond opening a malicious document. The fact that it affects multiple product versions including both legacy and newer DC (Document Cloud) releases demonstrates the persistence of the underlying code flaw, suggesting that Adobe's patching efforts may have been incomplete or that the vulnerability was introduced in core components that span multiple release lines.
Organizations utilizing affected Adobe products face substantial operational risks from this vulnerability, particularly in environments where PDF processing is common or where users may encounter untrusted documents. The potential for arbitrary code execution means that successful exploitation could allow attackers to establish persistent access, escalate privileges, or deploy additional malware payloads within the target environment. From an ATT&CK framework perspective, this vulnerability maps to multiple techniques including T1059 for command and script injection, T1068 for exploit for privilege escalation, and T1133 for external remote services, as attackers could leverage the compromised system for further network infiltration. The vulnerability's impact extends beyond immediate exploitation as it can serve as a foothold for broader attacks within an organization's network infrastructure. Organizations should consider this vulnerability as part of a broader attack chain where initial compromise through PDF-based attacks can lead to lateral movement and data exfiltration. The denial of service component of this vulnerability also represents a significant operational risk, as it can disrupt business processes and document workflows in environments where PDF processing is critical to daily operations.
Mitigation strategies for CVE-2016-4098 should prioritize immediate patching of all affected Adobe Reader and Acrobat installations across the organization. Adobe released security updates specifically addressing this vulnerability in their 11.0.16, 15.006.30172, and 15.016.20039 releases, making timely patch deployment essential. Organizations should implement network-based controls such as PDF content filtering and sandboxing solutions to prevent potentially malicious documents from reaching end users. Additionally, user education programs should emphasize the importance of only opening PDF documents from trusted sources and avoiding suspicious email attachments. From a defensive standpoint, implementing application whitelisting policies that restrict execution of Adobe Reader in high-risk environments can provide additional protection layers. Network monitoring should be enhanced to detect unusual PDF processing activities that might indicate exploitation attempts, while endpoint detection and response solutions should be configured to monitor for memory corruption indicators. The vulnerability's complexity and potential for exploitation make it crucial for organizations to conduct thorough vulnerability assessments and penetration testing to identify any remaining exposure risks. Security teams should also consider implementing automated patch management systems to ensure rapid deployment of security updates across all affected systems. Given the nature of memory corruption vulnerabilities, organizations should maintain robust backup and recovery procedures to minimize operational impact from potential exploitation events.