CVE-2018-15397

Cisco Adaptive Security Appliance IPsec VPN Denial of Service Vulnerability

Description

A vulnerability in the implementation of Traffic Flow Confidentiality (TFC) over IPsec functionality in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error that may occur if the affected software renegotiates the encryption key for an IPsec tunnel when certain TFC traffic is in flight. An attacker could exploit this vulnerability by sending a malicious stream of TFC traffic through an established IPsec tunnel on an affected device. A successful exploit could allow the attacker to cause a daemon process on the affected device to crash, which could cause the device to crash and result in a DoS condition.

Category

6.8
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.24%
Vendor Advisory cisco.com
Affected: Cisco Cisco Adaptive Security Appliance (ASA) Software
Published at:
Updated at:

References

Link Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-asa-ipsec-dos vendor advisory
http://www.securitytracker.com/id/1041786 vdb entry third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-15397?
CVE-2018-15397 has been scored as a medium severity vulnerability.
How to fix CVE-2018-15397?
To fix CVE-2018-15397, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-15397 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-15397 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-15397?
CVE-2018-15397 affects Cisco Cisco Adaptive Security Appliance (ASA) Software.
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