CVE-2021-34718 Cisco IOS XR Software Arbitrary File Read and Write Vulnerability

2021-09-0905:00:43

CWE-88

cisco

www.cve.org

cve

cisco

ssh

vulnerability

arbitrary file read

file write

input validation

scp

secure copy protocol

CVSS3

8.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

AI Score

8.1

Confidence

High

EPSS

0.002

Percentile

54.1%

JSON

A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device. This vulnerability is due to insufficient input validation of arguments that are supplied by the user for a specific file transfer method. An attacker with lower-level privileges could exploit this vulnerability by specifying Secure Copy Protocol (SCP) parameters when authenticating to a device. A successful exploit could allow the attacker to elevate their privileges and retrieve and upload files on a device that they should not have access to.

CNA Affected

[
  {
    "product": "Cisco IOS XR Software",
    "vendor": "Cisco",
    "versions": [
      {
        "status": "affected",
        "version": "n/a"
      }
    ]
  }
]