CVE-2018-15399: cisco adaptive_security_appliance_software Uncontrolled Resource Consumption

Vulnerability summary

CVE-2018-15399 is a high (CVSS 7.1) Uncontrolled Resource Consumption vulnerability in cisco adaptive_security_appliance_software. EPSS estimates a 1.84% chance of exploitation in the next 30 days, higher than 78.6% of scored vulnerabilities.

Timeline

1. 05-10-2018
   PublishedVulnerability first disclosed.
2. 26-11-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability in the TCP syslog module of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust the 1550-byte buffers on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing boundary check in an internal function. An attacker could exploit this vulnerability by establishing a man-in-the-middle position between an affected device and its configured TCP syslog server and then maliciously modifying the TCP header in segments that are sent from the syslog server to the affected device. A successful exploit could allow the attacker to exhaust buffer on the affected device and cause all TCP-based features to stop functioning, resulting in a DoS condition. The affected TCP-based features include AnyConnect SSL VPN, clientless SSL VPN, and management connections such as Secure Shell (SSH), Telnet, and HTTPS.

• CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
• CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.