A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to bypass the limited command set of the restricted Guest Shell and execute commands at the privilege level of a network-admin user outside of the Guest Shell. The attacker must authenticate with valid administrator device credentials.
The vulnerability is due to the incorrect implementation of a CLI command that allows a Bash command to be incorrectly invoked on the Guest Shell CLI. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Guest Shell prompt. A successful exploit could allow the attacker to issue commands that should be restricted by a Guest Shell account.
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-20190515-nxos-bash-bypass [“https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-nxos-bash-bypass”]
Vendor | Product | Version | CPE |
---|---|---|---|
cisco | cisco_nx-os_software | 7.0 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(0)n1 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(0\)n1:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(1)n1 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(1\)n1:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(2)i2 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(2\)i2:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(2)n1 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(2\)n1:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(3)f1 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(3\)f1:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(3)f2 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(3\)f2:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(3)f3 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(3\)f3:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(3)i1 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(3\)i1:*:*:*:*:*:*:* |
cisco | cisco_nx-os_software | 7.0(3)i2 | cpe:2.3:a:cisco:cisco_nx-os_software:7.0\(3\)i2:*:*:*:*:*:*:* |