Multiple Vulnerabilities in Cisco RV Series Routers Could Allow for Arbitrary Code Execution

DESCRIPTION:
Multiple vulnerabilities have been discovered in Cisco RV series small
business routers, the most severe of which could allow for arbitrary
code execution. The Cisco RV series routers are recommended for
connecting your small business’ internal network devices to each other.
Successful exploitation of the most severe of these vulnerabilities
could allow an unauthenticated, remote attacker to execute arbitrary
code on the affected systems.

IMPACT:
Multiple vulnerabilities have been discovered in Cisco RV series small
business routers, the most severe of which could allow for arbitrary
code execution Details of these vulnerabilities are as follows:

* A vulnerability in the web-based management interface could allow for
arbitrary code execution on the affected device due to insufficient user
input validation. An attacker could exploit this vulnerability by
sending malicious requests to the affected device and executing
arbitrary commands on the underlying OS (CVE-2021-1473).
* A vulnerability in the web-based management interface could allow for
authentication bypass and uploading of files to directories that should
require administrative authentication. This vulnerability occurs due to
an improper session management flaw on the affected device. An attacker
utilizing specially crafted HTTP requests can upload files to restricted
directories (CVE-2021-1472).

Successful exploitation of the most severe of these vulnerabilities
could allow an unauthenticated, remote attacker to execute arbitrary
code on the affected systems.

SYSTEM AFFECTED:
* RV160, RV160W, RV260, RV260P, and RV260W prior to 1.0.01.03
* RV340, RV340W, RV345, and RV345P prior to 1.0.03.21

RECOMMENDATIONS:
We recommend the following actions be taken:

* Install the update provided by Cisco immediately after appropriate
testing.
* Disable the Remote Management for the affected devices
* Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv-bypass-inject-Rbhgvfdx
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1472
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1473