CVE-1999-0938 in SDR
Summary
by MITRE
MBone SDR Package allows remote attackers to execute commands via shell metacharacters in Session Initiation Protocol (SIP) messages.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-0938 resides within the MBone SDR Package, a critical component in multicast communication systems that facilitates session initiation and management through the Session Initiation Protocol. This flaw represents a significant security weakness in network infrastructure software that was prevalent during the late 1990s and early 2000s when multicast communications were gaining adoption in academic and research environments. The MBone network, serving as a precursor to modern internet multicast services, relied heavily on the SDR Package for managing session states and handling SIP messages that coordinate multimedia communications across distributed networks. The vulnerability manifests when the system fails to properly sanitize input parameters within SIP messages, creating an opportunity for malicious actors to inject shell metacharacters that can be interpreted and executed by the underlying system shell.
The technical exploitation of this vulnerability occurs through the manipulation of SIP message parameters that are processed by the SDR Package without adequate input validation or sanitization. When an attacker crafts a malicious SIP message containing shell metacharacters such as semicolons, ampersands, or command substitution operators, these characters can be passed directly to the system shell, enabling arbitrary command execution with the privileges of the process handling the SIP messages. This represents a classic command injection vulnerability that operates at the application layer and can be classified under CWE-77 as "Improper Neutralization of Special Elements used in a Command ('Command Injection'). The vulnerability exploits the trust placed in session initiation messages and demonstrates how insufficient input validation in network protocol implementations can create persistent security risks that remain undetected for extended periods due to the specialized nature of multicast network environments.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and potential network-wide disruption. Remote attackers can leverage this flaw to execute arbitrary code on affected systems, potentially gaining administrative control over multicast network infrastructure components that manage critical multimedia sessions. The implications are particularly severe in research environments where the MBone network supported sensitive academic collaborations and experimental network services. Attackers could use this vulnerability to modify session parameters, redirect multicast traffic, or even establish persistent backdoors within the network infrastructure. This vulnerability also aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter and T1068 for Exploitation for Privilege Escalation, demonstrating how network protocol vulnerabilities can be weaponized to achieve broader system compromise objectives.
Mitigation strategies for CVE-1999-0938 require immediate implementation of input validation and sanitization measures within the SDR Package and related multicast infrastructure components. System administrators should implement strict parameter validation for all SIP message inputs, ensuring that special shell metacharacters are properly escaped or filtered before processing. The most effective approach involves updating to patched versions of the MBone SDR Package that incorporate proper input sanitization routines and following security best practices for network protocol implementation. Organizations should also consider network segmentation and access controls to limit exposure of multicast infrastructure components to untrusted networks, while implementing monitoring solutions that can detect anomalous SIP message patterns indicative of exploitation attempts. Additionally, regular security audits of multicast network configurations and comprehensive vulnerability assessments should be conducted to identify similar input validation weaknesses in other network infrastructure components that may be susceptible to analogous command injection attacks. The remediation process must also include thorough testing of patched implementations to ensure that legitimate session initiation functionality remains intact while eliminating the command injection vector that enables remote code execution.