Multiple vulnerabilities in Cisco IOS XE Software for Cisco ASR 900 Series



Published: 2020-09-30
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2020-3416
CVE-2020-3513
CWE ID CWE-749
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Cisco ASR 900 Series
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco IOS XE
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Advisory

1) Exposed dangerous method or function

Risk: Low

CVSSv3: 5.8 [CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3416

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code at bootup and break the chain of trust.

The vulnerability exists due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. A local administrator can copy a specific file to the local file system, define specific ROMMON variables and run arbitrary code on the system with root privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 900 Series: -

Cisco IOS XE: 17.2

CPE External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-rsp3-rce-jVHg8Z7c

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

2) Exposed dangerous method or function

Risk: Low

CVSSv3: 5.8 [CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-3513

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code at bootup and break the chain of trust.

The vulnerability exists due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. A local administrator can copy a specific file to the local file system, define specific ROMMON variables and run arbitrary code on the system with root privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 900 Series: -

Cisco IOS XE: 16.12.1

CPE External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-rsp3-rce-jVHg8Z7c

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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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