Improper Neutralization of Argument Delimiters in a Command in Cisco IOS XR Software



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-34718
CWE-ID CWE-88
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Cisco IOS XR
Operating systems & Components / Operating system

ASR9K-PX
Hardware solutions / Firmware

IOSXRWBD
Hardware solutions / Firmware

NCS5500
Hardware solutions / Firmware

CRS-PX
Hardware solutions / Firmware

XRV9K
Hardware solutions / Firmware

NCS560
Hardware solutions / Firmware

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Neutralization of Argument Delimiters in a Command

EUVDB-ID: #VU56429

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-34718

CWE-ID: CWE-88 - Argument Injection or Modification

Exploit availability: No

Description

The vulnerability allows a remote attacker to overwrite and read arbitrary files.

The vulnerability exists due to improper input validation in the SSH Server process. A remote authenticated attacker can specify Secure Copy Protocol (SCP) parameters when authenticating to a device and retrieve and upload files on a target device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 6.2.3 - 7.2.2

ASR9K-PX: All versions

IOSXRWBD: All versions

NCS5500: All versions

CRS-PX: All versions

XRV9K: All versions

NCS560: All versions

CPE2.3 External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-scp-inject-QwZOCv2


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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



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