cisco-sa-20181003-asa-syslog-dos: Cisco Adaptive Security Appliance TCP Syslog Denial of Service Vulnerability
First published: Wed Oct 03 2018(Updated: )
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. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-asa-syslog-dos
Credit: J-M Roth.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Adaptive Security Appliance Software | ||
| Cisco Firepower Management Center (FMC) and Firepower Threat Defense (FTD) Software |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20181003-asa-syslog-dos?
The cisco-sa-20181003-asa-syslog-dos vulnerability has a critical severity rating as it allows for a denial of service (DoS) attack.
How do I fix cisco-sa-20181003-asa-syslog-dos?
To fix the cisco-sa-20181003-asa-syslog-dos vulnerability, upgrade to the latest version of the affected Cisco ASA or FTD software.
What devices are affected by cisco-sa-20181003-asa-syslog-dos?
The cisco-sa-20181003-asa-syslog-dos vulnerability affects Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software.
Can an authenticated user exploit cisco-sa-20181003-asa-syslog-dos?
No, the cisco-sa-20181003-asa-syslog-dos vulnerability can be exploited by an unauthenticated remote attacker.
What is the nature of the attack for cisco-sa-20181003-asa-syslog-dos?
The attack for cisco-sa-20181003-asa-syslog-dos involves exhausting 1550-byte buffers, leading to denial of service on the affected device.
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