CVE-2019-8009 in Acrobat Reader
Summary
by MITRE
Adobe Acrobat and Reader versions, 2019.012.20035 and earlier, 2019.012.20035 and earlier, 2017.011.30142 and earlier, 2017.011.30143 and earlier, 2017.011.30142 and earlier, 2015.006.30497 and earlier, and 2015.006.30498 and earlier have an out-of-bounds write vulnerability. Successful exploitation could lead to arbitrary code execution.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/28/2020
The vulnerability identified as CVE-2019-8009 represents a critical out-of-bounds write flaw affecting multiple versions of Adobe Acrobat and Reader software. This vulnerability manifests in the handling of specific file formats and processing operations within the affected applications, creating a scenario where maliciously crafted input can trigger memory corruption. The flaw exists in the software's memory management mechanisms, particularly when parsing certain PDF objects or embedded content that exceeds expected boundaries. Such vulnerabilities typically arise from insufficient bounds checking during data processing, allowing attackers to write data beyond allocated memory regions. The affected versions span across different release cycles including 2019.012.20035, 2017.011.30142, 2015.006.30497, and their respective predecessors, indicating this represents a longstanding issue within Adobe's PDF processing engine. The vulnerability classification aligns with CWE-787, which specifically addresses out-of-bounds write conditions in software systems. This type of flaw is particularly dangerous as it provides attackers with the potential to execute arbitrary code within the context of the victim's system, making it a prime target for exploitation in targeted attacks.
The technical exploitation of this vulnerability requires an attacker to craft a malicious PDF file that triggers the out-of-bounds write condition during document parsing. When the vulnerable application processes this specially crafted file, the memory corruption can be leveraged to overwrite critical memory locations, potentially including return addresses or function pointers. This memory corruption enables attackers to redirect program execution flow, ultimately allowing them to inject and execute malicious code. The attack typically requires user interaction, such as opening the malicious document, which makes social engineering a critical component of successful exploitation. The vulnerability's impact extends beyond simple code execution as it can provide attackers with persistent access to victim systems, potentially enabling further reconnaissance, data exfiltration, or lateral movement within networks. The exploitation process often follows established attack patterns documented in the MITRE ATT&CK framework, specifically relating to execution techniques and privilege escalation methods. Attackers may employ techniques such as return-oriented programming or just-in-time compilation to bypass modern exploit mitigations like address space layout randomization and data execution prevention.
The operational impact of CVE-2019-8009 is substantial across enterprise environments where Adobe Acrobat and Reader are widely deployed. Organizations face significant risk from targeted attacks that exploit this vulnerability, particularly in sectors handling sensitive documents or where users frequently open PDF files from untrusted sources. The vulnerability affects not only end-user systems but also server environments that process PDF documents, potentially creating broader attack surfaces. Security teams must consider the wide range of affected versions when assessing risk and implementing mitigation strategies, as the vulnerability spans multiple major releases and support cycles. The exploitation of this vulnerability can lead to complete system compromise, as attackers gain the ability to execute code with the privileges of the affected application. This makes the vulnerability particularly attractive to threat actors seeking persistent access to enterprise networks, as it can be used to establish footholds for more extensive attacks. The widespread deployment of Adobe Reader across organizations means that even a single successful exploitation event can result in significant security incidents. Organizations should also consider the potential for this vulnerability to be leveraged in supply chain attacks, where malicious actors target the PDF processing capabilities of widely-used applications to compromise multiple organizations simultaneously.
Mitigation strategies for CVE-2019-8009 should prioritize immediate patching of all affected versions, as Adobe has released security updates addressing this vulnerability. Organizations should implement comprehensive application whitelisting policies to restrict execution of untrusted PDF files, particularly in high-risk environments. Network-based protections such as intrusion detection systems and web application firewalls can help detect and block exploitation attempts targeting this vulnerability. Security teams should also consider implementing sandboxing mechanisms for PDF processing, isolating document rendering in secure environments to contain potential exploitation attempts. Regular security assessments and vulnerability scanning should include checks for unpatched Adobe applications, as this vulnerability can persist in environments where patch management processes are inadequate. Additional defensive measures include user education programs to reduce the likelihood of opening malicious PDF files and implementing strict email filtering policies to prevent delivery of exploit payloads. The mitigation approach should align with industry best practices and security frameworks such as those recommended by the National Institute of Standards and Technology, emphasizing layered defense strategies. Organizations should also maintain detailed incident response plans that specifically address exploitation of memory corruption vulnerabilities, ensuring rapid detection and containment of potential breaches. Regular security awareness training for personnel handling sensitive documents can significantly reduce the risk of successful social engineering attacks that leverage this vulnerability.