SB2021060213 - Authorization bypass in Cisco ASR 5000 Series Software
Published: June 2, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Improper Authorization (CVE-ID: CVE-2021-1539)
The vulnerability allows a remote user to gain unauthorized access to the system.
The vulnerability exists in the authorization process of Cisco ASR 5000 Series Software (StarOS) due to incorrect authorization of non-interactive CLI commands. A remote authenticate user can bypass TACACS authorization by sending a crafted Secure Shell (SSH) request to an affected device and execute a certain CLI commands.
Successful exploitation of the vulnerability may result in unauthorized access to sensitive information or denial of service condition.
2) Improper Authorization (CVE-ID: CVE-2021-1540)
The vulnerability allows a remote user to gain unauthorized access to the system.
The vulnerability exists due to incorrect authorization of non-interactive CLI commands in the authorization process of Cisco ASR 5000 Series Software (StarOS). A remote authenticated user can send a specially crafted SSH request to an affected device, bypass the nocli option and execute certain CLI commands.
Remediation
Install update from vendor's website.