CVE-2012-4987 in RealPlayer
Summary
by MITRE
Stack-based buffer overflow in RealNetworks RealPlayer 15.0.5.109 allows user-assisted remote attackers to execute arbitrary code via a crafted ZIP file that triggers incorrect processing of long pathnames by the Watch Folders feature.
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Analysis
by VulDB Data Team • 04/21/2017
The vulnerability identified as CVE-2012-4987 represents a critical stack-based buffer overflow within RealNetworks RealPlayer version 15.0.5.109 that fundamentally compromises system security through improper handling of file pathnames. This flaw specifically manifests within the Watch Folders feature, which is designed to monitor designated directories for new media files and automatically process them. The vulnerability arises from insufficient input validation when processing file paths, particularly those exceeding normal length parameters, creating a condition where attacker-controlled data can overwrite adjacent memory locations on the stack. The flaw operates through a user-assisted remote attack vector, meaning that successful exploitation requires the victim to interact with a maliciously crafted ZIP file, typically through normal file processing activities. This attack model aligns with common exploitation techniques described in the attack pattern taxonomy under the MITRE ATT&CK framework, specifically categorized under privilege escalation and code execution techniques.
The technical implementation of this vulnerability stems from improper boundary checking within the pathname processing logic of RealPlayer's Watch Folders functionality. When a ZIP file containing excessively long pathnames is processed, the application fails to validate the length of the extracted paths against predetermined buffer limits. This oversight creates a classic stack buffer overflow condition where the excessive data overflows into adjacent memory segments, potentially corrupting the return address of the calling function or other critical program state information. The CWE (Common Weakness Enumeration) classification for this vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions that occur when insufficient bounds checking allows data to overwrite adjacent stack memory. The overflow can be leveraged to overwrite the instruction pointer or other critical control data, enabling attackers to redirect program execution flow and ultimately execute arbitrary code with the privileges of the affected user.
The operational impact of CVE-2012-4987 extends beyond simple code execution, as it represents a significant threat to enterprise security infrastructure and individual user systems. Attackers can exploit this vulnerability to gain unauthorized access to systems, potentially escalating privileges and establishing persistent backdoors within network environments. The user-assisted nature of the attack means that successful exploitation does not require direct network access to the target system, as the vulnerability can be triggered through legitimate file sharing or email attachments. Organizations running affected versions of RealPlayer face substantial risk exposure, particularly in environments where users frequently process multimedia files from untrusted sources. The vulnerability's presence in a widely used media player application means that exploitation can occur across diverse threat surfaces, from individual workstations to corporate networks. Security professionals should note that this vulnerability demonstrates the critical importance of input validation in multimedia processing applications, as similar patterns of inadequate boundary checking have been identified in numerous other media handling components throughout the industry.
Mitigation strategies for CVE-2012-4987 should encompass both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. The primary and most effective mitigation involves immediate patching of RealPlayer installations to versions that address the buffer overflow condition through proper input validation and length checking mechanisms. Organizations should implement network segmentation and access controls to limit the potential impact of successful exploitation attempts, particularly in environments where users have elevated privileges. The implementation of application whitelisting policies can prevent unauthorized execution of vulnerable applications, while regular security assessments should verify that all multimedia processing components maintain proper boundary checking. System administrators should also consider deploying intrusion detection systems that can identify suspicious file processing activities, particularly those involving long pathnames or unusual ZIP file structures. The vulnerability serves as a reminder of the necessity for robust input validation and secure coding practices, particularly in applications that process untrusted data from external sources. Additionally, user education programs should emphasize the risks associated with processing multimedia files from unknown or untrusted sources, as this vulnerability specifically relies on social engineering aspects to achieve successful exploitation.