CVE-2014-0618 in Junos
Summary
by MITRE
Juniper Junos before 10.4 before 10.4R16, 11.4 before 11.4R8, 12.1R before 12.1R7, 12.1X44 before 12.1X44-D20, and 12.1X45 before 12.1X45-D10 on SRX Series service gateways, when used as a UAC enforcer and captive portal is enabled, allows remote attackers to cause a denial of service (flowd crash) via a crafted HTTP message.
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Analysis
by VulDB Data Team • 06/04/2021
The vulnerability identified as CVE-2014-0618 affects Juniper Junos operating system versions prior to specific release thresholds on SRX Series service gateways. This issue manifests when the device functions as a UAC enforcer with captive portal functionality enabled, creating a critical security gap that remote attackers can exploit to trigger system instability. The vulnerability specifically targets the flowd process, which is responsible for managing network flow information and traffic monitoring within the Junos environment.
The technical flaw resides in the improper handling of crafted HTTP messages within the captive portal implementation of the Junos operating system. When a specially constructed HTTP request is sent to the affected device, it causes the flowd daemon to crash and restart, leading to a denial of service condition that disrupts network connectivity for legitimate users. This vulnerability represents a classic buffer overflow or input validation issue that occurs during HTTP message parsing, where the system fails to properly sanitize or validate incoming HTTP headers and content before processing them within the flow management subsystem. The flaw demonstrates poor error handling practices and inadequate input validation mechanisms that are fundamental to secure system design.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network availability and user access to services. When the flowd process crashes, the SRX device loses its ability to properly monitor and manage network flows, effectively creating a network outage that affects all users passing through the device. This denial of service condition can be particularly damaging in enterprise environments where SRX Series gateways serve as critical network infrastructure components. The vulnerability affects multiple version lines of Junos, indicating a widespread issue that required coordinated patching across different release branches, and it represents a significant risk to network security operations that could be exploited by malicious actors to disrupt business continuity.
Mitigation strategies for CVE-2014-0618 involve immediate deployment of vendor-provided patches and firmware updates that address the specific input validation issues within the flowd process. Network administrators should also implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Monitoring for unusual traffic patterns or repeated connection attempts that might indicate exploitation attempts should be enabled, along with implementing intrusion detection systems that can identify malformed HTTP traffic targeting this specific vulnerability. The remediation process should include thorough testing of patches in controlled environments before deployment to production systems. This vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a typical example of how improper input validation can lead to system instability and denial of service conditions. From an ATT&CK perspective, this vulnerability maps to the T1499.004 technique related to network denial of service, and could potentially be used as an initial access vector in broader attack campaigns targeting network infrastructure.