CVE-2012-2268 in Helix Server
Summary
by MITRE
master.exe in the SNMP Master Agent in RealNetworks Helix Server and Helix Mobile Server 14.x before 14.3.x allows remote attackers to cause a denial of service (unhandled exception and daemon crash) via a crafted Open-PDU request that triggers incorrect DisplayString processing, a different vulnerability than CVE-2012-1923.
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Analysis
by VulDB Data Team • 12/01/2021
The vulnerability identified as CVE-2012-2268 affects the SNMP Master Agent component within RealNetworks Helix Server and Helix Mobile Server versions 14.x prior to 14.3.x. This issue resides in the master.exe executable which handles SNMP protocol communications and represents a critical denial of service weakness that can be exploited remotely by malicious actors without requiring authentication. The vulnerability specifically targets the Open-PDU request processing mechanism within the SNMP implementation, where improper handling of DisplayString data types leads to unhandled exceptions that ultimately cause the daemon to crash and become unavailable to legitimate users.
The technical flaw manifests when a crafted Open-PDU request is sent to the affected server, triggering incorrect processing of DisplayString values within the SNMP protocol stack. This particular vulnerability differs from CVE-2012-1923 in its specific attack vector and implementation details, though both relate to SNMP processing weaknesses in the Helix Server software. The flaw occurs at the protocol parsing layer where the master.exe process fails to properly validate or sanitize incoming DisplayString data, leading to an unhandled exception that terminates the SNMP daemon service. This represents a classic buffer overflow or parsing error condition that falls under CWE-129, which deals with improper validation of array indices and other bounds checking issues.
From an operational impact perspective, this vulnerability creates a significant availability risk for organizations relying on RealNetworks Helix Server for media streaming services or network monitoring. The remote denial of service attack can be executed from any network location without requiring privileged access, making it particularly dangerous for publicly accessible servers. When the daemon crashes, legitimate users lose access to the streaming services and SNMP monitoring capabilities that depend on the affected server. The impact extends beyond simple service disruption as network administrators may experience difficulties in monitoring system health and performance metrics during the service outage period.
The exploitation of this vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks targeting services and protocols. Organizations should implement immediate mitigations including applying the vendor patch released in version 14.3.x of the Helix Server software. Network segmentation and access control measures can provide temporary protection by limiting exposure of the SNMP service to only trusted networks. Additionally, monitoring for unusual SNMP traffic patterns and implementing intrusion detection systems can help detect potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation and exception handling in network services, as recommended by security frameworks such as the OWASP Top Ten and NIST guidelines for secure coding practices. Organizations should also consider implementing redundant monitoring systems to ensure continuous availability of critical network services despite potential single-point failures in legacy software components.