CVE-2012-2142 in Poppler
Summary
by MITRE
The error function in Error.cc in poppler before 0.21.4 allows remote attackers to execute arbitrary commands via a PDF containing an escape sequence for a terminal emulator.
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Analysis
by VulDB Data Team • 04/27/2025
The vulnerability identified as CVE-2012-2142 represents a critical command injection flaw within the poppler PDF library, specifically affecting versions prior to 0.21.4. This issue resides in the error function implementation within the Error.cc file, where insufficient input validation allows malicious PDF documents to contain escape sequences that can be interpreted by terminal emulators. The vulnerability stems from the library's failure to properly sanitize user-supplied data during PDF processing, creating an avenue for remote code execution through crafted PDF files. Attackers can exploit this weakness by embedding specially crafted escape sequences within PDF documents that, when processed by vulnerable poppler implementations, trigger unintended terminal emulator commands.
The technical exploitation of this vulnerability leverages the inherent trust placed in PDF processing libraries when handling documents from untrusted sources. When a vulnerable poppler-based application processes a malicious PDF containing escape sequences, the error handling mechanism fails to properly isolate or escape these sequences, allowing them to be interpreted as actual terminal commands. This represents a classic command injection vulnerability where user-controllable input flows directly into system execution contexts. The flaw operates at the intersection of PDF parsing and terminal emulation, where the library's error reporting mechanism becomes a vector for arbitrary command execution. This vulnerability is particularly dangerous because it can be triggered through normal PDF document processing without requiring any special privileges or user interaction beyond opening the document.
The operational impact of CVE-2012-2142 extends across numerous applications that rely on poppler for PDF rendering and processing, including web browsers, document viewers, and server-side PDF handling systems. Any system that processes PDF documents from untrusted sources becomes vulnerable to remote code execution, potentially allowing attackers to gain full control over affected systems. The vulnerability affects both client-side applications and server-side processing environments, creating widespread exposure across web applications, email servers, and document management systems. Organizations using poppler-based PDF libraries in production environments face significant risk, as a single malicious PDF document can compromise entire systems. This vulnerability particularly impacts systems that automatically process or render PDF documents without proper input sanitization, creating a persistent threat vector for attackers seeking to exploit document processing applications.
Mitigation strategies for CVE-2012-2142 focus primarily on upgrading to poppler version 0.21.4 or later, which includes proper input sanitization and escape sequence handling in the error processing functions. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive updates promptly. Additionally, network segmentation and application whitelisting can provide defense-in-depth measures by limiting the exposure of vulnerable applications to untrusted PDF content. Input validation should be implemented at multiple layers, including application-level filtering of PDF documents and proper sandboxing of PDF processing environments. The vulnerability aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and maps to ATT&CK technique T1059.007 for command and scripting interpreter. Security monitoring should include detection of unusual PDF processing patterns and potential command execution attempts, while access controls should restrict PDF processing to trusted sources only. System administrators should also consider implementing web application firewalls and content filtering solutions to prevent the delivery of potentially malicious PDF content to vulnerable applications.