CVE-2014-3820 in Junos Pulse
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the SSL VPN/UAC web server in the Juniper Junos Pulse Secure Access Service (SSL VPN) devices with IVE OS 7.1 before 7.1r16, 7.4 before 7.4r3, and 8.0 before 8.0r1 and the Juniper Junos Pulse Access Control Service devices with UAC OS 4.1 before 4.1r8, 4.4 before 4.4r3 and 5.0 before 5.0r1 allows remote administrators to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 02/16/2022
The CVE-2014-3820 vulnerability represents a critical cross-site scripting flaw discovered in Juniper's SSL VPN and Unified Access Control (UAC) solutions, specifically affecting multiple versions of the IVE OS and UAC OS platforms. This vulnerability resides within the web server component of the Junos Pulse Secure Access Service devices, creating a significant attack surface that could be exploited by remote administrators to inject malicious web scripts or HTML content. The flaw manifests in the SSL VPN/UAC web server implementation, making it particularly dangerous as it targets the administrative interfaces that typically require elevated privileges and contain sensitive operational data.
The technical nature of this vulnerability falls under the CWE-79 category of Cross-Site Scripting, where the system fails to properly validate or sanitize user input before incorporating it into web page responses. The unspecified vectors suggest that the vulnerability could be triggered through multiple attack pathways within the web server's input handling mechanisms, potentially including form fields, URL parameters, or other user-controllable data inputs. This weakness allows an authenticated attacker with administrative privileges to craft malicious payloads that would execute in the context of other administrators or users interacting with the affected web interfaces, creating a persistent threat that could escalate to full system compromise.
The operational impact of this vulnerability extends beyond simple script injection, as it could enable attackers to perform session hijacking, steal administrative credentials, modify access controls, or even redirect users to malicious sites. Given that these devices typically serve as critical gateway points for remote access to corporate networks, the exploitation of this vulnerability could provide attackers with persistent access to sensitive internal resources. The fact that the vulnerability affects multiple version streams including 7.1, 7.4, 8.0, and various UAC OS versions indicates a widespread exposure across Juniper's product portfolio, potentially affecting organizations of all sizes that rely on these access control solutions for remote workforce management.
Organizations affected by this vulnerability should immediately implement the vendor-provided patches for the specific affected versions, particularly focusing on the IVE OS versions 7.1r16, 7.4r3, and 8.0r1, as well as UAC OS versions 4.1r8, 4.4r3, and 5.0r1. Network segmentation and access control measures should be strengthened to limit the blast radius of potential exploitation, while monitoring for suspicious administrative activities and unusual web traffic patterns. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches for network infrastructure devices, as the attack surface provided by unpatched administrative interfaces can be leveraged to establish persistent footholds within corporate networks, potentially aligning with ATT&CK techniques for privilege escalation and persistence.