A vulnerability in the DNS code of Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an affected system to reload. The vulnerability is due to improper processing of DNS packets. An attacker could exploit this vulnerability by sending a request to an affected Cisco ASA appliance to cause it to generate a DNS request packet. The attacker would need to spoof the reply packet with a crafted DNS response. Note: Only traffic directed to the affected device can be used to exploit this vulnerability. This vulnerability affects Cisco ASA Software configured in routed or transparent firewall mode and single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. This vulnerability is documented in Cisco bug ID CSCut03495 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2015-6325. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-asa-dns1
Note: By default, the DNS name-server value is not configured in any DNS server group.ciscoasa# show running-config dns server-group DNS server-group DefaultDNS name-server 192.168.1.1 . . .
ciscoasa# show version | include Version
Cisco Adaptive Security Appliance Software Version 9.2(1)
Device Manager Version 7.4(1)
Cisco ASA Major Release | First Fixed Release for This Vulnerability | First Fixed Release for All Vulnerabilities Described in the October 2015 ASA Security Advisory Bundled Publication |
---|---|---|
7.2 | Affected; migrate to 8.2(5.58) or later | Affected; migrate to 8.2(5.58) or later |
8.2 | 8.2(5.58) | 8.2(5.58) and later |
8.3 | Affected; migrate to 8.4(7.29) or later | Affected; migrate to 8.4(7.29) or later |
8.4 | 8.4(7.29) | 8.4(7.29) |
8.5 | Affected; migrate to 9.0(4.37) or later | Affected; migrate to 9.0(4.37) or later |
8.6 | Affected; migrate to 9.0(4.37) or later | Affected; migrate to 9.0(4.37) or later |
8.7 | 8.7(1.17) | 8.7(1.17) and later |
9.0 |
9.0(4.37) | 9.0(4.37) and later |
9.1 | 9.1(6.4) | 9.1(6.8) and later |
9.2 | 9.2(4) | 9.2(4) and later |
9.3 | 9.3(3.1) | 9.3(3.5) and later |
9.4 | 9.4(1.1) | 9.4(2) and later |
9.5 | Not affected | Not affected |
Products > Security > Firewalls > Adaptive Security Appliances (ASA) > ASA 5500 Series Adaptive Security Appliances >For the Cisco ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, navigate to the following path. To find interim versions, click All Releases > Interim on the left side of the download page.> Adaptive Security Appliance (ASA) Software
Products > Cisco Interfaces and Modules > Services Modules > Catalyst 6500 Series / 7600 Series ASA Services Module > Adaptive Security Appliance (ASA) SoftwareFor the Cisco ASA 1000V Cloud Firewall, navigate to the following path:
Products > Security > Firewalls > Adaptive Security Appliances (ASA) > ASA 1000V Cloud FirewallFor the Cisco Adaptive Security Virtual Appliance (ASAv), navigate to the following path:
Products > Security > Firewalls > Adaptive Security Appliances (ASA) > Adaptive Security Virtual Appliance (ASAv) > Adaptive Security Appliance (ASA) SoftwareFor the Cisco FirePOWER 9300 ASA Module, navigate to the following path:
Products > Security > Firewalls > Adaptive Security Appliances (ASA) > Firepower 9000 Series > Firepower 9300 Security Appliance >Adaptive Security Appliance (ASA) Software
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Version | Description | Section | Status | Date |
---|---|---|---|---|
1.1 | Corrected recommended release version for Cisco ASA 9.3 train. | Fixed Software | Final | 2015-November-12 |
1.0 | Initial public release. | - | Final | 2015-October-21 |
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