CVE-2013-6014 in Junos
Summary
by MITRE
Juniper Junos 10.4 before 10.4S15, 11.4 before 11.4R9, 11.4X27 before 11.4X27.44, 12.1 before 12.1R7, 12.1X44 before 12.1X44-D20, 12.1X45 before 12.1X45-D15, 12.2 before 12.2R6, 12.3 before 12.3R3, 13.1 before 13.1R3, and 13.2 before 13.2R1, when Proxy ARP is enabled on an unnumbered interface, allows remote attackers to perform ARP poisoning attacks and possibly obtain sensitive information via a crafted ARP message.
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability identified as CVE-2013-6014 affects Juniper Junos operating system versions across multiple release branches including 10.4, 11.4, 12.1, 12.2, 12.3, 13.1, and 13.2. This security flaw specifically manifests when Proxy ARP functionality is enabled on unnumbered interfaces within the network infrastructure. The vulnerability stems from insufficient validation of incoming ARP messages, creating a pathway for malicious actors to exploit the network's address resolution protocol mechanisms. The affected versions represent a significant portion of Juniper's network equipment deployments, making this issue particularly widespread across enterprise and service provider networks. Proxy ARP is commonly implemented in scenarios where network segmentation requires devices to respond to ARP requests on behalf of other devices, typically in routing or firewall configurations where interfaces lack explicit IP addresses.
The technical implementation of this vulnerability involves the improper handling of ARP packet validation within the Junos operating system's network stack. When Proxy ARP is enabled on unnumbered interfaces, the system fails to properly authenticate or validate the source of ARP requests, allowing attackers to inject malicious ARP responses into the network. This weakness specifically targets the address resolution protocol which is fundamental to network communication, enabling attackers to manipulate the mapping between IP addresses and MAC addresses. The flaw creates a condition where legitimate network traffic can be redirected or intercepted, as the ARP cache of network devices can be poisoned with false mappings. This vulnerability is particularly dangerous because it operates at the network layer, affecting the core communication mechanisms that underpin all network services and applications. The attack vector requires only that an attacker be able to send crafted ARP messages to the affected network devices, which can be accomplished from within the local network segment or through network interception techniques.
The operational impact of CVE-2013-6014 extends beyond simple information disclosure to encompass potential network disruption and unauthorized access capabilities. An attacker exploiting this vulnerability can perform man-in-the-middle attacks by poisoning ARP caches across multiple network devices, effectively allowing them to intercept, modify, or redirect network traffic between communicating parties. The potential for sensitive information exposure exists because the poisoned ARP tables can cause devices to send traffic to incorrect destinations, potentially exposing confidential data to unauthorized parties. Additionally, the vulnerability could enable attackers to gain insights into network topology and device configurations through the manipulation of ARP responses. This represents a critical weakness in network security infrastructure, as Proxy ARP is commonly implemented in firewalls, routers, and other security appliances where such exposure could compromise entire network segments. The vulnerability aligns with CWE-200, which addresses "Information Exposure," and potentially CWE-264, "Permissions, Privileges, and Access Controls," as it enables unauthorized network manipulation. From an ATT&CK framework perspective, this vulnerability maps to T1071.004, "Application Layer Protocol: DNS," and T1566, "Phishing," as attackers could leverage the compromised ARP tables to redirect traffic to malicious endpoints.
Mitigation strategies for CVE-2013-6014 primarily involve immediate software updates to patched versions of the Junos operating system. Juniper released specific patches for all affected versions, including 10.4S15, 11.4R9, 11.4X27.44, 12.1R7, 12.1X44-D20, 12.1X45-D15, 12.2R6, 12.3R3, 13.1R3, and 13.2R1, which address the ARP validation weakness. Network administrators should also consider disabling Proxy ARP functionality on unnumbered interfaces where it is not strictly required for network operations, as this eliminates the attack surface entirely. Additional protective measures include implementing ARP inspection mechanisms, deploying network monitoring tools to detect unusual ARP activity patterns, and configuring network segmentation to limit the scope of potential ARP poisoning attacks. Organizations should conduct thorough network assessments to identify all affected devices and ensure proper patch management procedures are in place to prevent similar vulnerabilities from emerging in the future. The vulnerability demonstrates the critical importance of proper input validation in network protocol implementations and highlights the need for continuous security testing of core network infrastructure components.