CVE-2024-20484 in Enterprise Chat and Email
Summary
by MITRE • 11/06/2024
A vulnerability in the External Agent Assignment Service (EAAS) feature of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to insufficient validation of Media Routing Peripheral Interface Manager (MR PIM) traffic that is received by an affected device. An attacker could exploit this vulnerability by sending crafted MR PIM traffic to an affected device. A successful exploit could allow the attacker to trigger a failure on the MR PIM connection between Cisco ECE and Cisco Unified Contact Center Enterprise (CCE), leading to a DoS condition on EAAS that would prevent customers from starting chat, callback, or delayed callback sessions. Note: When the attack traffic stops, the EAAS process must be manually restarted to restore normal operation. To restart the process in the System Console, choose Shared Resources > Services > Unified CCE > EAAS, then click Start.
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Analysis
by VulDB Data Team • 11/06/2024
The vulnerability identified as CVE-2024-20484 resides within Cisco Enterprise Chat and Email's External Agent Assignment Service feature, representing a critical security weakness that undermines the availability of core communication services. This flaw specifically targets the Media Routing Peripheral Interface Manager traffic processing within the Cisco ECE platform, creating an avenue for remote attackers to disrupt essential business operations without requiring authentication credentials. The affected system operates as a bridge between Cisco ECE and Cisco Unified Contact Center Enterprise, facilitating critical customer interaction services including chat, callback, and delayed callback sessions that form the backbone of enterprise communication infrastructure.
The technical root cause of this vulnerability stems from inadequate input validation mechanisms within the MR PIM traffic handling subsystem. When the system receives traffic from the Media Routing Peripheral Interface Manager, it fails to properly validate the incoming data structures and protocols, allowing malformed or maliciously crafted packets to bypass normal security checks. This insufficient validation creates a pathway for attackers to inject specially constructed MR PIM traffic that triggers unexpected behavior in the system's connection management processes. The vulnerability aligns with CWE-20, which addresses "Improper Input Validation," and represents a classic example of how inadequate data sanitization can lead to system instability and service disruption.
The operational impact of this vulnerability extends beyond simple service interruption, as it fundamentally compromises the reliability of customer communication channels within enterprise environments. When successfully exploited, the vulnerability causes a complete failure in the MR PIM connection between Cisco ECE and Cisco CCE, resulting in a cascading denial of service condition that affects multiple critical business functions. Customers attempting to initiate chat sessions, request callback services, or schedule delayed callback interactions would encounter immediate service failures, potentially leading to significant business disruption and customer dissatisfaction. The DoS condition affects the External Agent Assignment Service specifically, which is responsible for managing the assignment of external agents to customer interactions, making it particularly damaging to contact center operations and customer service delivery.
The exploitation of this vulnerability requires minimal attacker capabilities, as it does not require authentication or privileged access to the system. An unauthenticated remote attacker can simply send crafted MR PIM traffic to the affected device, making the attack surface extremely broad and accessible. The attack does not require specialized tools or deep technical knowledge, as it leverages fundamental protocol handling weaknesses that can be exploited through standard network traffic generation techniques. The manual restart requirement for the EAAS process after exploitation creates additional operational overhead, as system administrators must manually intervene to restore service functionality, potentially extending downtime and requiring immediate response protocols. This vulnerability demonstrates the importance of implementing robust input validation and traffic filtering mechanisms in enterprise communication platforms, as highlighted in ATT&CK technique T1499.004 for network denial of service attacks.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to restrict access to MR PIM ports, deployment of intrusion detection systems to monitor for suspicious traffic patterns, and implementation of traffic filtering rules to prevent malformed MR PIM packets from reaching the affected devices. The recommended approach includes disabling unnecessary MR PIM services when not actively required, implementing rate limiting on incoming traffic to prevent flooding attacks, and establishing automated monitoring systems to detect and alert on abnormal connection patterns. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in related systems, while maintaining up-to-date patches and firmware updates to address known vulnerabilities in the Cisco ECE platform. The manual restart requirement emphasizes the need for robust monitoring and automated recovery procedures to minimize service disruption impact and ensure rapid restoration of communication services.