CVE-2018-0048 in Junos
Summary
by MITRE
A vulnerability in the Routing Protocols Daemon (RPD) with Juniper Extension Toolkit (JET) support can allow a network based unauthenticated attacker to cause a severe memory exhaustion condition on the device. This can have an adverse impact on the system performance and availability. This issue only affects devices with JET support running Junos OS 17.2R1 and subsequent releases. Other versions of Junos OS are unaffected by this vulnerability. Affected releases are Juniper Networks Junos OS: 17.2 versions prior to 17.2R1-S7, 17.2R2-S6, 17.2R3; 17.2X75 versions prior to 17.2X75-D102, 17.2X75-D110; 17.3 versions prior to 17.3R2-S4, 17.3R3; 17.4 versions prior to 17.4R1-S5, 17.4R2; 18.1 versions prior to 18.1R2-S3, 18.1R3;
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Analysis
by VulDB Data Team • 05/23/2023
This vulnerability resides within the Routing Protocols Daemon component of Juniper Networks Junos OS operating systems, specifically affecting devices that utilize the Juniper Extension Toolkit for enhanced functionality. The flaw manifests as a memory exhaustion condition that can be triggered by unauthenticated network-based attackers, representing a significant security concern that impacts system availability and performance. The vulnerability is particularly concerning because it allows remote attackers to consume system resources without requiring any authentication credentials, making it an attractive target for denial-of-service attacks. The issue is specifically tied to the interaction between the RPD and JET support, which enables external applications to communicate with the routing daemon and potentially exploit memory management flaws within this communication channel.
The technical exploitation of this vulnerability involves crafting specific network packets that trigger memory allocation patterns within the RPD process, leading to progressive memory consumption until system resources are exhausted. This type of memory exhaustion attack represents a classic denial-of-service vector that can render network devices inoperable, affecting routing functions and potentially causing network outages. The vulnerability affects a specific set of Junos OS versions, with the problem first appearing in 17.2R1 releases and persisting through various subsequent patches and minor versions. The affected systems demonstrate a failure in proper input validation and memory management within the routing protocol daemon, particularly when processing data from external applications communicating through the JET framework. This flaw aligns with common software security weaknesses documented in CWE-400, which addresses unrestricted resource consumption, and represents a direct threat to system availability as defined in the ATT&CK framework under the privilege escalation and denial-of-service tactics.
The operational impact of this vulnerability extends beyond simple service disruption, as it can cause cascading failures within network infrastructure where routing stability is critical. Network administrators may experience complete device unresponsiveness, requiring manual intervention and potentially resulting in extended downtime for affected systems. The memory exhaustion condition can lead to system crashes, restarts, and in severe cases, may require complete device reboot to restore normal operations. Organizations relying on Juniper devices for critical network routing functions face significant risk of service interruptions, particularly in environments where network availability is paramount for business operations. The vulnerability's impact is particularly severe because it affects devices that are typically considered to be in production environments with critical network functions, and the lack of authentication requirements means that attackers can exploit this vulnerability from anywhere on the network. This represents a fundamental security failure in the memory management and input validation processes within the RPD component, making it a high-priority issue for network security teams to address immediately through proper patching and system updates.
Mitigation strategies should focus on applying the appropriate software patches released by Juniper Networks, which address the memory management flaws within the RPD component. Organizations should prioritize updating their Junos OS installations to versions that contain the security fixes, particularly those that have been specifically released to address CVE-2018-0048. Network segmentation and access control measures can provide additional protection by limiting network access to devices running affected software versions, though these measures do not address the underlying vulnerability. Monitoring systems should be configured to detect unusual memory consumption patterns that may indicate exploitation attempts, and network administrators should implement regular vulnerability scanning procedures to identify affected devices. The security community should also consider implementing network-based intrusion detection systems that can identify and block the specific packet patterns associated with this vulnerability. Organizations should develop incident response procedures that account for this type of denial-of-service attack, ensuring that network teams are prepared to respond quickly to potential exploitation attempts and can implement emergency mitigation measures when necessary.