SB2017041904 - Remote DoS when parsing DNS responses in Cisco ASA
Published: April 19, 2017
Security Bulletin ID
SB2017041904
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper input validation (CVE-ID: CVE-2017-6607)
The vulnerability allows a remote attacker to cause denial of service vulnerability.
The vulnerability exists due to improper parsing of malformed DNS responses. A remote attacker can send trigger the device to send a DNS request to malicious DNS server, reply with specially crafted DNS response packet perform a denial of service (DoS) attack.
Successful exploitation of the vulnerability may allow an attacker to reload the affected device causing DoS conditions or corrupt local DNS cache information.
Remediation
Install update from vendor's website.