CVE-2009-1062 in Acrobat Reader
Summary
by MITRE
Adobe Acrobat Reader 9 before 9.1, 8 before 8.1.4, and 7 before 7.1.1 might allow remote attackers to trigger memory corruption and possibly execute arbitrary code via unknown attack vectors related to JBIG2, a different vulnerability than CVE-2009-0193 and CVE-2009-1061.
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Analysis
by VulDB Data Team • 08/09/2021
Adobe Acrobat Reader versions prior to 9.1, 8.1.4, and 7.1.1 contain a memory corruption vulnerability within their JBIG2 image processing functionality that could enable remote attackers to execute arbitrary code on affected systems. This vulnerability specifically affects the handling of JBIG2 compressed image data within PDF documents, representing a distinct issue from other related vulnerabilities such as CVE-2009-0193 and CVE-2009-1061. The flaw stems from insufficient input validation and memory management when processing malformed JBIG2 streams that are embedded within PDF files, creating potential buffer overflows or other memory corruption conditions that could be exploited by malicious actors. The vulnerability operates at the application layer and requires a user to open a specially crafted PDF document containing malicious JBIG2 data, making it a classic example of a remote code execution vulnerability through document manipulation. This issue falls under the CWE-125 vulnerability category, which encompasses out-of-bounds read conditions, and aligns with ATT&CK technique T1203 for exploitation of software vulnerabilities. The memory corruption occurs during the decompression and rendering process of JBIG2 images, where the application fails to properly validate the size and structure of compressed data streams before allocating memory buffers. Attackers can leverage this vulnerability by crafting PDF documents with malformed JBIG2 data that, when processed by the vulnerable Acrobat Reader versions, triggers memory corruption and potentially allows for arbitrary code execution with the privileges of the user running the application.
The technical impact of this vulnerability extends beyond simple memory corruption to encompass potential privilege escalation and system compromise. When a user opens a malicious PDF file, the Acrobat Reader application attempts to decompress JBIG2 data using a flawed implementation that does not adequately check array bounds or validate data structures. This processing error can lead to stack or heap corruption that may be exploited to overwrite critical memory locations, potentially redirecting program execution flow to malicious code injected by the attacker. The vulnerability is particularly concerning because it operates within the context of a widely used document reader application, making it an attractive target for phishing campaigns and targeted attacks. The flaw demonstrates poor defensive programming practices where insufficient bounds checking and memory allocation validation allow attackers to manipulate the application's memory state through carefully crafted input data. Security researchers have noted that the vulnerability represents a common class of software defects that occur in image processing libraries where compressed data formats are parsed without adequate safeguards against malformed inputs. This type of vulnerability is classified under the broader ATT&CK tactic of Execution and can be used as a foothold for more sophisticated attacks, potentially leading to full system compromise.
Organizations and individuals should immediately update their Adobe Acrobat Reader installations to versions 9.1, 8.1.4, or 7.1.1 respectively to mitigate this vulnerability. The recommended mitigation strategy includes implementing application whitelisting policies that restrict the execution of untrusted PDF files, deploying network-based intrusion detection systems to monitor for suspicious PDF content, and educating users about the risks of opening PDF documents from untrusted sources. System administrators should also consider implementing sandboxing mechanisms for PDF processing and regularly monitoring for exploitation attempts through security information and event management systems. The vulnerability highlights the importance of keeping third-party applications updated, particularly those handling untrusted content like document readers, as these applications often serve as attack vectors due to their broad user base and frequent interaction with potentially malicious files. Security professionals should also consider this vulnerability in the context of zero-day threat modeling and ensure that their incident response procedures include specific handling for PDF-based exploitation attempts. Regular security assessments should include evaluation of document processing capabilities within enterprise applications to identify similar vulnerabilities in other software components that may process similar compressed image formats or binary data streams. The remediation approach must also include monitoring for exploitation attempts through network traffic analysis and endpoint detection systems that can identify unusual PDF processing behavior indicative of exploitation attempts.