CVE-2013-6013 in Junos
Summary
by MITRE
Buffer overflow in the flow daemon (flowd) in Juniper Junos 10.4 before 10.4S14, 11.4 before 11.4R7-S2, 12.1.X44 before 12.1X44-D15, 12.1X45 before 12.1X45-D10 on SRX devices, when using telnet pass-through authentication on the firewall, might allow remote attackers to execute arbitrary code via a crafted telnet message.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 12/23/2024
The vulnerability identified as CVE-2013-6013 represents a critical buffer overflow flaw within the flow daemon component of Juniper Junos operating system versions prior to specific security patches. This vulnerability specifically affects SRX series firewall devices and occurs within the flowd service responsible for network flow monitoring and data collection. The flaw manifests when the system processes telnet pass-through authentication requests, creating an exploitable condition that could enable remote code execution. The affected versions span multiple release branches including 10.4, 11.4, and 12.1, with specific patch levels required to remediate the issue. This vulnerability demonstrates the inherent risks associated with network daemon implementations that fail to properly validate input parameters from remote sources.
The technical implementation of this buffer overflow stems from inadequate input validation within the flow daemon's telnet handling mechanism. When processing crafted telnet messages containing maliciously formatted data, the flowd service fails to properly bounds-check buffer allocations, allowing attackers to overwrite adjacent memory regions. This memory corruption can potentially be leveraged to overwrite critical program execution pointers, return addresses, or function pointers within the daemon's memory space. The vulnerability specifically occurs during the processing of authentication-related telnet traffic where the system attempts to parse and validate telnet options and suboption data. According to CWE classification, this represents a classic buffer overflow vulnerability categorized under CWE-121, which involves insufficient bounds checking of memory buffers. The attack vector requires remote network access to the affected SRX device and specifically targets the telnet pass-through authentication functionality that many network administrators utilize for device management.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass full system compromise capabilities for remote attackers. Successful exploitation could result in complete control over the affected SRX device, enabling attackers to modify firewall rules, access network traffic, establish persistent backdoors, or use the compromised device as a pivot point for attacking internal network segments. Network administrators who rely on telnet pass-through authentication for remote device management face particular risk, as this functionality provides a direct pathway for attackers to exploit the vulnerability without requiring physical access or local credentials. The vulnerability's remote exploitability means that attackers can target these devices from outside the network perimeter, potentially affecting organizations with exposed firewall management interfaces. From an ATT&CK framework perspective, this vulnerability maps to techniques involving remote code execution and privilege escalation, with potential for lateral movement through compromised network infrastructure. The attack could also facilitate data exfiltration and denial of service conditions that could disrupt network security operations.
Mitigation strategies for CVE-2013-6013 require immediate implementation of vendor-provided security patches across all affected Junos versions. Organizations should prioritize patching their SRX devices to the latest recommended release levels, specifically targeting the versions that include fixes for this buffer overflow vulnerability. Network segmentation and access control measures should be implemented to limit direct network access to firewall management interfaces, particularly those supporting telnet pass-through authentication. The implementation of network monitoring solutions capable of detecting anomalous telnet traffic patterns can provide early warning of potential exploitation attempts. Security teams should disable telnet pass-through authentication where possible and transition to more secure authentication mechanisms such as SSH-based management protocols. Regular vulnerability assessments and network scanning should be conducted to identify any remaining unpatched devices within the network infrastructure. Additionally, implementing intrusion detection systems with signatures specific to this vulnerability can help detect exploitation attempts. Organizations should also review their network access control policies to ensure that only authorized personnel can access firewall management interfaces, reducing the attack surface for remote exploitation attempts. The remediation process should include thorough testing of patched systems to ensure that security updates do not introduce compatibility issues with existing network services or configurations.