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Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerability

cisco-sa-iosxr-LJtNFjeN · High · Published · Updated

A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local CLI shell user to elevate privileges and gain full administrative control of the device. The vulnerability is due to incorrect mapping of a command to task groups within the source code. An attacker could exploit this vulnerability by first authenticating to the local CLI shell on the device and using the CLI command to bypass the task group–based checks. A successful exploit could allow the attacker to elevate privileges and perform actions on the device without authorization checks. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-LJtNFjeN

Cisco advisory ·CSAF JSON

Workarounds

Workarounds exist only for devices that have TACACS+ authentication, authorization, and accounting (AAA) command authorization configured. Administrators can use this feature to permit access to only the commands that nonadministrative users require and deny access to all other commands.

For more information about Cisco IOS XR task groups and AAA, see ASR9000/XR Using Task groups and understanding Priv levels and authorization https://community.cisco.com/t5/service-providers-documents/asr9000-xr-using-task-groups-and-understanding-priv-levels-and/ta-p/3109596 .

CVEsCVE-2020-3473
Cisco Bug IDsCSCvs12604
CVSS ScoreBase 7.8
Base 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS XR Software

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