Cisco FXOS and NX-OS System Software Multiple Denial of Service Vulnerabilities

by taranis

Advisory ID: BGD-2019-0011

Version: 1.00

Probability: high

CVE ID: CVE-2019-1598

Damage: medium

Publication date: 2019-04-01

Description: Multiple vulnerabilities in the implementation of the Lightweight Directory Access Protocol (LDAP) feature in Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of LDAP packets by an affected device. An attacker could exploit these vulnerabilities by sending an LDAP packet crafted using Basic Encoding Rules (BER) to an affected device. The LDAP packet must have a source IP address of an LDAP server configured on the targeted device. A successful exploit could cause the affected device to reload, resulting in a DoS condition. Firepower 4100 Series Next-Generation Firewalls are affected in versions prior to 2.0.1.201, 2.2.2.54, and 2.3.1.75. Firepower 9300 Security Appliances are affected in versions prior to 2.0.1.201, 2.2.2.54, and 2.3.1.75. MDS 9000 Series Multilayer Switches are affected in versions prior to 8.2(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I7(1). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(2). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(20), 7.3(2)D1(1), and 8.2(1). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I7(1). UCS 6200 and 6300 Fabric Interconnect are affected in versions prior to 3.2(2b).

Product(s) affected:

• Cisco UCS 6300 Series Fabric Interconnects 0
• Cisco UCS 6200 Series Fabric Interconnects 0
• Cisco NX-OS 8.3
• Cisco NX-OS 8.2
• Cisco NX-OS 8.1
• Cisco NX-OS 8.0
• Cisco NX-OS 7.3
• Cisco NX-OS 7.2
• Cisco NX-OS 7.0(3)I7
• Cisco NX-OS 7.0(3)I6
• Cisco NX-OS 7.0(3)I5
• Cisco NX-OS 7.0(3)I4
• Cisco NX-OS 7.0(3)
• Cisco NX-OS 6.2
• Cisco NX-OS 6.0(2)A8
• Cisco NX-OS 5.2
• Cisco Nexus 9000 Series Switches in standalone NX-OS mode 0
• Cisco Nexus 7700 Series Switches 0
• Cisco Nexus 7000 Series Switches 0
• Cisco Nexus 3500 Platform Switches 0
• Cisco Nexus 3000 Series Switches 0
• Cisco MDS 9000 Series Multilayer Switches 0
• Cisco FXOS 2.4
• Cisco FXOS 2.3
• Cisco FXOS 2.2
• Cisco FXOS 2.1
• Cisco FXOS 2.0
• Cisco FXOS 1.1
• Cisco Firepower 9300 Security Appliance 0
• Cisco Firepower 4100 Series Next-Generation Firewall 0
• Not Vulnerable:
• Cisco NX-OS 8.3(2)
• Cisco NX-OS 8.2(3)
• Cisco NX-OS 7.0(3)I7(6)
• Cisco NX-OS 6.2(27)
• Cisco NX-OS 6.2(22)
• Cisco NX-OS 6.0(2)A8(11)
• Cisco NX-OS 3.2(3j)
• Cisco FXOS 2.4.1.222
• Cisco FXOS 2.3.1.110
• Cisco FXOS 2.2.2.91

Platform(s) affected:

• cisco AsyncOS
• cisco NX-OS Software Cisco Nexus 1000V Switch for VMware vSphere 4.0(4)SV1(3d)
• cisco NX-OS Software for Nexus 3000 Series 6.0(2)A7(1)
• cisco NX-OS Software for Nexus 9000 Series
• cisco UCS Infrastructure and UCS Manager Software 2.0(5a)

Mitigation: Updates are available. Please see the references or vendor advisory for more information.

Reference URL’s:

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxosldap

taranis