CVE-2017-2820 in Poppler
Summary
by MITRE
An exploitable integer overflow vulnerability exists in the JPEG 2000 image parsing functionality of freedesktop.org Poppler 0.53.0. A specially crafted PDF file can lead to an integer overflow causing out of bounds memory overwrite on the heap resulting in potential arbitrary code execution. To trigger this vulnerability, a victim must open the malicious PDF in an application using this library.
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Analysis
by VulDB Data Team • 12/12/2022
The vulnerability identified as CVE-2017-2820 represents a critical security flaw within the Poppler library version 0.53.0, which is widely utilized for PDF rendering across various applications and operating systems. This library serves as a fundamental component in numerous software packages including web browsers, document viewers, and office suites, making the potential impact of this vulnerability extensive and far-reaching. The issue manifests specifically within the JPEG 2000 image parsing functionality, which is a specialized image format support mechanism that allows Poppler to handle complex image data within PDF documents. The vulnerability falls under CWE-190, which categorizes integer overflow conditions that can lead to memory corruption and potentially arbitrary code execution.
The technical exploitation of this vulnerability occurs through a carefully crafted PDF file that contains malformed JPEG 2000 image data. When the vulnerable Poppler library processes such a file, the integer overflow condition arises during the parsing of image dimensions or memory allocation calculations. This overflow causes the application to allocate insufficient memory for the image data structure, subsequently leading to heap-based buffer overflows where data is written beyond the allocated memory boundaries. The nature of heap corruption in this context creates opportunities for attackers to manipulate memory layout and potentially execute arbitrary code with the privileges of the compromised application. This type of vulnerability aligns with ATT&CK technique T1059.007, which involves the use of application-specific exploits to achieve code execution in targeted environments.
The operational impact of CVE-2017-2820 extends beyond simple denial of service scenarios, as it enables sophisticated attack vectors that can compromise entire systems. Any application that relies on Poppler for PDF processing becomes a potential target, including web browsers like Firefox and Chrome when they utilize Poppler for PDF rendering, desktop applications such as Evince, and mobile applications that incorporate PDF viewing capabilities. The vulnerability's exploitation requires user interaction through opening a malicious PDF file, making it particularly dangerous in phishing campaigns or targeted attacks where social engineering plays a crucial role. Security researchers have documented that the integer overflow condition can be triggered even with seemingly benign PDF files, as the malicious payload is embedded within the JPEG 2000 image data structure rather than in the PDF's core functionality, making detection more challenging for traditional security mechanisms. The exploitation of this vulnerability demonstrates the critical importance of keeping third-party libraries updated, as the affected Poppler version 0.53.0 contained multiple other vulnerabilities that could compound the security risk for systems running unpatched software.
Mitigation strategies for CVE-2017-2820 primarily focus on immediate software updates and patch management procedures. Organizations should prioritize updating their Poppler library installations to versions that have addressed this integer overflow vulnerability, typically those released after the vulnerability disclosure in 2017. System administrators should implement comprehensive patch management policies that include regular security updates for all PDF rendering libraries and applications. Additional protective measures include implementing sandboxing techniques for PDF processing applications, utilizing application whitelisting to restrict execution of untrusted PDF files, and deploying network-based intrusion detection systems that can identify malicious PDF content. Security professionals should also consider implementing file format validation and content scanning mechanisms that can detect malformed JPEG 2000 data structures before they reach the vulnerable library. The vulnerability highlights the necessity of thorough input validation and memory safety practices in image processing libraries, particularly when handling complex format specifications that involve multiple mathematical operations for memory allocation calculations.