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Cisco Nexus 9000 Series ACI Mode Switch Software Link Layer Discovery Protocol Buffer Overflow Vulnerability

cisco-sa-20190731-nxos-bo · High · Published · Updated

A vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an adjacent, unauthenticated attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to the targeted device. A successful exploit may lead to a buffer overflow condition that could either cause a DoS condition or allow the attacker to execute arbitrary code with root privileges. Note: This vulnerability cannot be exploited by transit traffic through the device; the crafted packet must be targeted to a directly connected interface. In addition, the attack surface for this vulnerability can be greatly reduced by disabling LLDP on interfaces where it is not required. Cisco has released software updates that address this vulnerability. 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-20190731-nxos-bo

Cisco advisory ·CSAF JSON

Workarounds

A mitigation for this vulnerability is if LLDP is not enabled on the interface, then this vulnerability cannot be exploited. It is recommended to disable LLDP on all interfaces where it is not required. The CLI commands are [no] lldp transmit and [no] lldp transmit receive. For additional information, please refer to Cisco APIC Layer 2 Networking Configuration Guide https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/2-x/L2_config/b_Cisco_APIC_Layer_2_Configuration_Guide/b_Cisco_APIC_Layer_2_Configuration_Guide_chapter_0100.html .

CVEsCVE-2019-1901
Cisco Bug IDsCSCvp92121
CVSS ScoreBase 8.8
Base 8.8 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco NX-OS System Software in ACI Mode 12.2(2g), Cisco NX-OS System Software in ACI Mode 13.2(1l), Cisco NX-OS System Software in ACI Mode 13.2(1m), Cisco NX-OS System Software in ACI Mode 13.2(2l), Cisco NX-OS System Software in ACI Mode 13.2(2o), Cisco NX-OS System Software in ACI Mode 13.2(3i), Cisco NX-OS System Software in ACI Mode 13.2(3n), Cisco NX-OS System Software in ACI Mode 13.2(3o), Cisco NX-OS System Software in ACI Mode 13.2(3r), Cisco NX-OS System Software in ACI Mode 13.2(4d), Cisco NX-OS System Software in ACI Mode 13.2(4e), Cisco NX-OS System Software in ACI Mode 13.2(3j), Cisco NX-OS System Software in ACI Mode 13.2(3s), Cisco NX-OS System Software in ACI Mode 13.2(5d), Cisco NX-OS System Software in ACI Mode 13.2(5e), Cisco NX-OS System Software in ACI Mode 13.2(5f), Cisco NX-OS System Software in ACI Mode 13.2(6i), Cisco NX-OS System Software in ACI Mode 13.2(41d), Cisco NX-OS System Software in ACI Mode 14.0(1h), Cisco NX-OS System Software in ACI Mode 14.0(2c), Cisco NX-OS System Software in ACI Mode 14.0(3d), Cisco NX-OS System Software in ACI Mode 14.0(3c), Cisco NX-OS System Software in ACI Mode 14.1(1i), Cisco NX-OS System Software in ACI Mode 14.1(1j), Cisco NX-OS System Software in ACI Mode 14.1(1k), Cisco NX-OS System Software in ACI Mode 14.1(1l), Cisco NX-OS System Software in ACI Mode 14.1(2g), Cisco NX-OS System Software in ACI Mode, Cisco Nexus 9000 Series Switches

CSAF Product Statuses

Product Status Source CVE Rows
12.2(2g) known_affected cisco_csaf CVE-2019-1901 1
Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2019-1901 26

Related Products

Product CVE Evidence
Cisco NX-OS Software CVE-2019-1901 Cisco OpenVuln
Cisco NX-OS System Software in ACI Mode CVE-2019-1901 Cisco OpenVuln
Cisco Nexus 9000 Series Switches CVE-2019-1901 Cisco OpenVuln · family-level