Headline
CVE-2023-20198: Cisco Security Advisory: Cisco IOS XE Software Web UI Privilege Escalation Vulnerability
Cisco is aware of active exploitation of a previously unknown vulnerability in the web UI feature of Cisco IOS XE Software when exposed to the internet or to untrusted networks. This vulnerability allows a remote, unauthenticated attacker to create an account on an affected system with privilege level 15 access. The attacker can then use that account to gain control of the affected system. For steps to close the attack vector for this vulnerability, see the Recommendations section of this advisory Cisco will provide updates on the status of this investigation and when a software patch is available.
This vulnerability affects Cisco IOS XE Software if the web UI feature is enabled. The web UI feature is enabled through the ip http server or ip http secure-server commands.
Determine the HTTP Server Configuration
To determine whether the HTTP Server feature is enabled for a system, log in to the system and use the show running-config | include ip http server|secure|active command in the CLI to check for the presence of the ip http server command or the ip http secure-server command in the global configuration. If either command is present, the HTTP Server feature is enabled for the system.
The following example shows the output of the show running-config | include ip http server|secure|active command for a system that has the HTTP Server feature enabled:
Router# show running-config | include ip http server|secure|active
ip http server
ip http secure-server
Note: The presence of either command or both commands in the system configuration indicates that the web UI feature is enabled.
If the ip http server command is present and the configuration also contains ip http active-session-modules none, the vulnerability is not exploitable over HTTP.
If the ip http secure-server command is present and the configuration also contains ip http secure-active-session-modules none, the vulnerability is not exploitable over HTTPS.
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