CVE-2012-2895 in Chrome
Summary
by MITRE
The PDF functionality in Google Chrome before 22.0.1229.79 allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that trigger out-of-bounds write operations.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability identified as CVE-2012-2895 represents a critical security flaw in Google Chrome's PDF rendering engine that existed prior to version 22.0.1229.79. This issue specifically targets the browser's handling of PDF documents and manifests as an out-of-bounds write operation that can be exploited by remote attackers. The flaw resides within the PDF functionality component of the browser, which processes and displays PDF files through a dedicated rendering module that handles various PDF objects and structures.
The technical nature of this vulnerability stems from insufficient input validation and memory management within Chrome's PDF parser. When processing malformed or specially crafted PDF files, the browser's PDF engine fails to properly bounds-check array accesses or memory allocations, leading to out-of-bounds write operations. This type of flaw falls under the CWE-787 category of out-of-bounds write conditions, where an attacker can write data beyond the allocated memory boundaries. The vulnerability can be triggered through various PDF objects such as arrays, streams, or embedded content that contain malformed data structures designed to exploit the memory handling deficiencies in the PDF rendering engine.
The operational impact of CVE-2012-2895 extends beyond simple denial of service conditions to potentially enable more severe security consequences. While the primary effect is a denial of service that can crash the browser or specific PDF rendering processes, the vulnerability's potential for unspecified other impacts suggests that attackers might leverage this flaw to execute arbitrary code or escalate privileges. This represents a significant concern for users who frequently access PDF documents from untrusted sources, as the attack surface includes web-based PDF viewers, email attachments, and online document repositories. The vulnerability's remote exploitation capability means that attackers can compromise systems simply by enticing victims to view malicious PDF content through Chrome's built-in PDF viewer.
The attack vector for this vulnerability typically involves delivering a malicious PDF file through web browsers or email attachments that automatically trigger Chrome's PDF rendering functionality. When a user opens such a PDF file, the browser's PDF engine attempts to parse and render the document, triggering the out-of-bounds write condition. This vulnerability aligns with ATT&CK techniques related to code injection and privilege escalation, as the memory corruption could potentially be exploited to execute malicious code within the browser's sandboxed environment. The vulnerability's classification as a remote code execution risk, even in its unspecified impact category, underscores the importance of timely patching and user awareness regarding PDF document handling.
Mitigation strategies for CVE-2012-2895 primarily focus on immediate software updates and user behavior modifications. Organizations should prioritize updating Google Chrome to version 22.0.1229.79 or later, which includes patches addressing the out-of-bounds write conditions in the PDF rendering engine. Additionally, implementing browser security policies that disable inline PDF viewing or redirect PDF content to external applications can reduce the attack surface. Network administrators should consider deploying web application firewalls and content filtering solutions that can detect and block suspicious PDF content. User education regarding the risks of opening PDF files from untrusted sources remains crucial, as social engineering attacks often leverage PDF vulnerabilities to compromise systems. The vulnerability also highlights the importance of maintaining up-to-date browser security patches and implementing defense-in-depth strategies that reduce the impact of potential exploitation attempts.