SB2021090909 - Privilege escalation in Cisco IOS XR Software

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Main Vulnerability Database SB2021090909

SB2021090909 - Privilege escalation in Cisco IOS XR Software

Published: September 9, 2021

Security Bulletin ID SB2021090909
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Medium 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) OS Command Injection (CVE-ID: CVE-2021-34721)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper input validation in the XML configuration manager of Cisco IOS XR Software. A local user can pass specially crafted data to the application and execute arbitrary OS commands on the target system.


2) OS Command Injection (CVE-ID: CVE-2021-34722)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper input validation in the CLI of Cisco IOS XR Software. A local user can execute arbitrary OS commands on the system with root privileges.


Remediation

Install update from vendor's website.

References