CVE-2007-3410 in RealPlayer
Summary
by MITRE
Stack-based buffer overflow in the SmilTimeValue::parseWallClockValue function in smlprstime.cpp in RealNetworks RealPlayer 10, 10.1, and possibly 10.5, RealOne Player, RealPlayer Enterprise, and Helix Player 10.5-GOLD and 10.0.5 through 10.0.8, allows remote attackers to execute arbitrary code via an SMIL (SMIL2) file with a long wallclock value.
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Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2007-3410 represents a critical stack-based buffer overflow affecting multiple versions of RealNetworks RealPlayer software and related media players. This flaw exists within the SmilTimeValue::parseWallClockValue function located in the smlprstime.cpp source file, making it particularly dangerous as it targets the core parsing functionality of SMIL (Synchronized Multimedia Integration Language) files. The vulnerability affects RealPlayer versions 10, 10.1, and potentially 10.5, along with RealOne Player, RealPlayer Enterprise, and Helix Player versions 10.5-GOLD through 10.0.5 to 10.0.8, demonstrating the widespread impact across RealNetworks media player ecosystem. The attack vector requires remote exploitation through specially crafted SMIL files containing excessively long wallclock values, which allows attackers to manipulate memory layout and potentially execute arbitrary code on vulnerable systems.
The technical implementation of this buffer overflow stems from inadequate input validation within the parsing function that processes wallclock time specifications in SMIL files. When the SmilTimeValue::parseWallClockValue function encounters a wallclock value exceeding the allocated stack buffer size, it fails to properly bounds-check the input data before copying it into memory. This classic stack overflow condition occurs because the implementation does not verify that the length of the wallclock value parameter remains within predefined limits before performing memory operations. The vulnerability manifests when an attacker crafts an SMIL file with an excessively long wallclock value that overflows the stack buffer, potentially corrupting adjacent memory locations including return addresses and function pointers. This type of vulnerability maps directly to CWE-121 Stack-based Buffer Overflow, which is categorized under the broader category of CWE-119 Improper Access to Memory Locations in the Common Weakness Enumeration system.
The operational impact of CVE-2007-3410 extends beyond simple code execution, creating significant security implications for users who may inadvertently encounter malicious SMIL files through email attachments, web downloads, or compromised websites. Attackers can leverage this vulnerability to gain full control of affected systems, potentially leading to complete compromise including privilege escalation, data exfiltration, and persistent backdoor installation. The remote exploitation capability means that users need not interact with the malicious content directly, as simply opening an infected SMIL file within any of the affected players triggers the vulnerability. This makes the attack surface particularly large, as users may encounter these files in legitimate contexts such as corporate presentations, educational materials, or entertainment content. The vulnerability's presence in enterprise versions like RealPlayer Enterprise increases the risk for business environments where media playback is common and security controls may be less stringent than in specialized environments.
Mitigation strategies for CVE-2007-3410 must address both immediate remediation and long-term security posture improvements. The primary recommendation involves immediate patching of all affected RealPlayer versions through official RealNetworks security updates, as the vulnerability has been addressed in subsequent releases. Organizations should implement strict file type filtering and content validation for SMIL files, particularly in enterprise environments where media consumption is prevalent. Network-level controls such as web application firewalls and content inspection systems should be configured to block SMIL file types unless absolutely necessary for business operations. The vulnerability also highlights the importance of input validation and secure coding practices, particularly in legacy systems where buffer overflow vulnerabilities are common. Security teams should consider implementing runtime protections such as stack canaries, address space layout randomization, and data execution prevention mechanisms to reduce the exploitability of similar vulnerabilities. Additionally, user education regarding the dangers of opening untrusted media files and the importance of keeping software updated remains crucial in mitigating the risk associated with this and similar vulnerabilities. This case study aligns with ATT&CK technique T1203 Exploitation for Client Execution, emphasizing the need for comprehensive endpoint security controls and regular vulnerability assessment programs to identify and remediate such critical flaws in multimedia software platforms.