Privilege escalation in Cisco IOS XR Software



Published: 2020-09-03
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3473
CWE ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Cisco IOS XR
Operating systems & Components / Operating system

Cisco IOS XRv 9000 Router
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco 8000 Series Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco Network Convergence System 540 Series Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco Network Convergence System 560 Series Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Network Convergence System 5500 Series
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco Network Convergence System 6000 Series Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco Network Convergence System 4000
Hardware solutions / Other hardware appliances

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one low risk vulnerability.

1) Permissions, Privileges, and Access Controls

Risk: Low

CVSSv3: 6.8 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3473

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to incorrect mapping of a command to task groups within the source code. A local user can bypass the task group–based checks and gain elevated privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 5.0.0, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.2.0, 5.2.1, 5.2.2, 5.2.3, 5.2.4, 5.2.5, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 6.0.1, 6.0.2, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.2.1, 6.2.3, 6.2.25, 6.3.2, 6.3.3, 6.3.15, 6.4.1, 6.4.2, 6.4.3, 6.5.2, 6.5.3, 6.6.1, 6.6.2, 6.6.3, 6.6.25, 6.7.1, 7.0.1

Cisco IOS XRv 9000 Router: -

Cisco 8000 Series Routers: -

Cisco Network Convergence System 540 Series Routers: -

Cisco Network Convergence System 560 Series Routers: -

Cisco Network Convergence System 4000: -

Network Convergence System 5500 Series: -

Cisco Network Convergence System 6000 Series Routers: -

CPE External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-LJtNFjeN

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.