Cisco Security Advisory
Cisco FXOS Software CLI Arbitrary File Read and Write Vulnerability
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CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
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A vulnerability in the CLI of Cisco FXOS Software could allow an authenticated, local attacker to read or write arbitrary files on the underlying operating system (OS).
The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by including crafted arguments to a specific CLI command. A successful exploit could allow the attacker to read or write to arbitrary files on the underlying OS.
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-20200226-fxos-cli-file
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Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco products if they were running a vulnerable release of Cisco FXOS Software:
- Firepower 1000 Series
- Firepower 2100 Series
- Firepower 4100 Series
- Firepower 9300 Security Appliances
For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
- MDS 9000 Series Multilayer Switches
- Nexus 1000 Virtual Edge for VMware vSphere
- Nexus 1000V Switch for Microsoft Hyper-V
- Nexus 1000V Switch for VMware vSphere
- Nexus 3000 Series Switches
- Nexus 5500 Platform Switches
- Nexus 5600 Platform Switches
- Nexus 6000 Series Switches
- Nexus 7000 Series Switches
- Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode
- Nexus 9000 Series Switches in standalone NX-OS mode
- UCS 6200 Series Fabric Interconnects
- UCS 6300 Series Fabric Interconnects
- UCS 6400 Series Fabric Interconnects
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There are no workarounds that address this vulnerability.
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When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Cisco FXOS Software
At the time of publication, the release information in the following table(s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.
Firepower 1000 Series and 2100 Series appliances use Cisco FXOS Software as an underlying operating system, which is included in Cisco ASA Software unified image bundles or in Cisco FTD Software unified image bundles.
ASA Software for Firepower 1000 Series and Firepower 2100 Series: CSCvr09748
Cisco ASA Software Release First Fixed Release for This Vulnerability 9.8 Migrate to a fixed release. 9.9 9.9.2.66
9.10 Migrate to a fixed release.
9.12 Migrate to a fixed release. 9.13 9.13.1.7 FTD Software for Firepower 1000 Series and Firepower 2100 Series: CSCvr09748
Cisco FTD Software Release First Fixed Release for This Vulnerability 6.2.2 Migrate to a fixed release. 6.2.3 6.2.3.16 (Apr 2020)
6.3.0 Migrate to a fixed release. 6.4.0 Migrate to a fixed release. 6.5.0 6.5.0.4 FXOS Software for Firepower 4100 Series and Firepower 9300 Security Appliances: CSCvo42637
Cisco FXOS Software Release First Fixed Release for This Vulnerability Earlier than 2.2
Migrate to a fixed release.
2.2 2.2.2.97 2.3 2.3.1.155 2.4 2.4.1.238 2.6 2.6.1.157 2.7
Not vulnerable.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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This vulnerability was found during internal security testing.
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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.
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Show LessVersion Description Section Status Date 1.2 Updated FTD releases. Fixed Software Final 2020-March-10 1.1 Added ASA releases. Fixed Software Final 2020-March-06 1.0 Initial public release. - Final 2020-FEB-26
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