HTTP: Cisco IOS XE WebUI Authentication Bypass

This signature detects attempts to exploit a known vulnerability against Cisco IOS. A successful attack can lead to security bypass.

Extended Description

Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.

Affected Products

Cisco ios_xe

References

CVE: CVE-2023-20198

URL: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z

Short Name

HTTP:CISCO:IOS-WEB-AUTH-BYPASS

Severity

Major

Recommended

True

Recommended Action

Drop

HTTP: Cisco IOS XE WebUI Authentication Bypass

Extended Description

Affected Products

References

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