cisco-sa-20190515-nxos-conf-bypass: Cisco FXOS and NX-OS Software Secure Configuration Bypass Vulnerability
First published: Wed May 15 2019(Updated: )
A vulnerability in the Secure Configuration Validation functionality of Cisco FXOS Software and Cisco NX-OS Software could allow an authenticated, local attacker to run arbitrary commands at system boot time with the privileges of root. The vulnerability is due to a lack of proper validation of system files when the persistent configuration information is read from the file system. An attacker could exploit this vulnerability by authenticating to the device and overwriting the persistent configuration storage with malicious executable files. An exploit could allow the attacker to run arbitrary commands at system startup and those commands will run as the root user. The attacker must have valid administrative credentials for the device. 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-conf-bypass
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco FX-OS | =2.4<2.4.1.101=Prior to 2.4<2.4.1.101 | 2.4.1.101 2.4.1.101 |
| Cisco NX-OS | =8.1<8.1(1b)=6.2<6.2(29)=5.2<6.2(29) | 8.1(1b) 6.2(29) 6.2(29) |
| Cisco NX-OS | ||
| Cisco NX-OS | =6.0(2)A8<6.0(2)A8(11)=Prior to 6.0(2)A8<6.0(2)A8(11) | 6.0(2)A8(11) 6.0(2)A8(11) |
| Cisco NX-OS | =6.2<6.2(22)=Prior to 6.2<6.2(22) | 6.2(22) 6.2(22) |
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Reference Links
Frequently Asked Questions
What is the Cisco FXOS and NX-OS Software Secure Configuration Bypass Vulnerability?
A vulnerability that allows an authenticated, local attacker to run arbitrary commands at system boot time with root privileges.
How does the vulnerability occur?
The vulnerability is due to a lack of proper validation of system configuration parameters.
What is the severity of Cisco FXOS and NX-OS Software Secure Configuration Bypass Vulnerability?
The severity of this vulnerability is medium with a CVSS score of 6.7.
Which Cisco products are affected by this vulnerability?
Cisco FXOS Software versions prior to 2.4.1.101 and Cisco NX-OS Software versions prior to 8.1(1b), 6.2(29), 6.0(2)A8(11), and 6.2(22) are affected.
How can the Cisco FXOS and NX-OS Software Secure Configuration Bypass Vulnerability be fixed?
Upgrade to Cisco FXOS Software version 2.4.1.101 or later, or upgrade to Cisco NX-OS Software version 8.1(1b), 6.2(29), 6.0(2)A8(11), or 6.2(22) or later.
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- agent/softwarecombine
- agent/tags
- collector/cisco-advisory
- source/Cisco
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- vendor/cisco
- canonical/cisco fx-os
- version/cisco fx-os/2.4
- version/cisco fx-os/prior to 2.4
- canonical/cisco nx-os
- version/cisco nx-os/8.1
- version/cisco nx-os/6.2
- version/cisco nx-os/5.2
- version/cisco nx-os/6.0(2)a8
- version/cisco nx-os/prior to 6.0(2)a8
- version/cisco nx-os/prior to 6.2