SB2021042705 - Multiple vulnerabilities in Buffalo routers

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Main Vulnerability Database SB2021042705

SB2021042705 - Multiple vulnerabilities in Buffalo routers

Published: April 27, 2021 Updated: October 25, 2024

Security Bulletin ID SB2021042705
CSH Severity
Critical
Patch available
NO
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 33% Medium 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Path traversal (CVE-ID: CVE-2021-20090)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the web interfaces. A remote attacker can send a specially crafted HTTP request and bypass authentication.

Note, the vulnerability is being exploited in-the-wild by the Mirai botnet in August 2021.


2) Code Injection (CVE-ID: CVE-2021-20091)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the web interfaces. A remote authenticated attacker can send a specially crafted request and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


3) Improper access control (CVE-ID: CVE-2021-20092)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the web interfaces. A remote attacker can bypass implemented security restrictions and gain unauthorized access to sensitive information on the system.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References