Improper Neutralization of Argument Delimiters in a Command in Cisco Systems, Inc products - CVE-2021-34718
Published: September 9, 2021
Vulnerability identifier: #VU56429
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-34718
CWE-ID: CWE-88
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
ASR9K-PX
IOSXRWBD
NCS5500
CRS-PX
XRV9K
NCS560
Cisco IOS XR
IOSXRWBD
NCS5500
CRS-PX
XRV9K
NCS560
Cisco IOS XR
How to mitigate CVE-2021-34718
Install updates from vendor's website.
Cisco IOS XR - addressed in versions 7.3.2, 7.4.1