CVE-2013-4684 in Junos
Summary
by MITRE
flowd in Juniper Junos 10.4 before 10.4S14, 11.4 before 11.4R8, 12.1 before 12.1R7, and 12.1X44 before 12.1X44-D15 on SRX devices, when PIM and NAT are enabled, allows remote attackers to cause a denial of service (daemon crash) via crafted PIM packets, aka PR 842253.
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability identified as CVE-2013-4684 affects the flowd daemon in Juniper Junos operating system versions prior to specific security releases. This issue specifically impacts SRX series devices where Protocol Independent Multicast (PIM) functionality is enabled alongside Network Address Translation (NAT) capabilities. The flaw manifests as a denial of service condition that can be triggered remotely through the careful crafting of PIM packets, leading to daemon crashes and subsequent service disruption. This vulnerability represents a significant security concern for network infrastructure devices as it allows unauthorized remote actors to disrupt network operations without requiring authentication credentials.
The technical root cause of this vulnerability lies within the flowd daemon's insufficient input validation mechanisms when processing PIM packets in environments where NAT is also active. When the daemon receives specially crafted PIM packets, it fails to properly handle the malformed data structures, resulting in memory corruption or unexpected behavior that ultimately leads to the daemon crashing and restarting. This represents a classic buffer overflow or input validation vulnerability where the system does not adequately sanitize incoming network traffic before processing it. The vulnerability is categorized under CWE-121 as it involves heap-based buffer overflow conditions that occur when processing malformed input data. The attack vector is particularly concerning as it requires no authentication and can be executed from remote locations, making it accessible to any network attacker with basic knowledge of network protocols.
The operational impact of CVE-2013-4684 extends beyond simple service disruption to potentially compromise network availability and reliability. When the flowd daemon crashes, it affects the device's ability to maintain proper routing and forwarding decisions, which can lead to complete network outages or partial service degradation depending on the network topology and redundancy configurations. This vulnerability directly impacts the availability component of the CIA triad and can be leveraged as part of broader attack campaigns targeting network infrastructure. The vulnerability aligns with ATT&CK technique T1499.004 which involves network disruption attacks, and can be classified under T1566.001 as it represents a remote exploitation vector targeting network infrastructure. Organizations using affected Juniper SRX devices may experience unexpected downtime, service interruptions, and potential security breaches if this vulnerability remains unpatched.
Mitigation strategies for CVE-2013-4684 should include immediate deployment of the security patches released by Juniper for the affected software versions. Organizations should also consider implementing network segmentation and access controls to limit exposure to this vulnerability, particularly in environments where the affected devices are directly accessible from untrusted networks. Network administrators should monitor for suspicious PIM traffic patterns and implement intrusion detection systems that can identify and alert on malformed PIM packets. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all affected devices and ensure proper patch management processes are in place to prevent similar issues in the future. The vulnerability demonstrates the importance of maintaining current security patches and implementing defense-in-depth strategies for network infrastructure devices, as it highlights how seemingly isolated functionality can create cascading failures in network operations.