Cisco fixes critical flaws in its Small Business Routers
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2022-20699 | Stack Buffer Overflow RCE in Cisco Small Business RV Series Routers CVE-2022-20699 is a stack-based buffer overflow (CWE-121, caused by improper input-size validation per CWE-1284) in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers, one of a set of related flaws fixed in the same Cisco advisory. It can be triggered remotely without authentication by sending crafted requests to the router's network-facing services; the available public PoC demonstrates unauthenticated remote code execution against the RV340 via its SSL VPN interface. A successful attacker can execute arbitrary code or commands, elevate privileges, bypass authentication and authorization protections, install unsigned software, or crash the device (denial of service). Any organization running these small-business routers is affected, with the highest risk for devices whose web management or SSL VPN interface is reachable from the internet. The flaw is confirmed to be exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-03, EPSS estimates a 72.5% probability of exploitation within 30 days, and at least one public proof-of-concept is available. Do: Upgrade all RV160, RV260, RV340/340W and RV345/345P routers to the fixed firmware released in Cisco's advisory, applying updates per vendor instructions as required by the CISA KEV entry. Until patched, limit exposure by restricting web management and SSL VPN to trusted source addresses or disabling SSL VPN where it is not needed. Because active exploitation and a public unauthenticated RCE PoC exist, prioritize internet-facing devices and check them for signs of compromise. | 9.8 group max | 72% | KEV PoC |
| largetens of thousands of internet-exposed routers (order of ~10^4 devices) |
Full article458 words · extracted from securityaffairs.com · click to collapse
Pierluigi Paganini
February 03, 2022
Cisco released security patches to address multiple flaws in its Small Business RV160, RV260, RV340, and RV345 series routers.
Cisco announced patches for multiple issue affecting its Small Business RV160, RV260, RV340, and RV345 series routers. Some of the bugs fixed by the IT giant could lead to the execution of arbitrary code with root privileges.
The most severe flaw fixed by the company is a remote code execution issue tracked as CVE-2022-20699 (CVSS score of 10.0). The root cause of the flaw are the insufficient boundary checks performed during the processing of specific HTTP requests.
“A vulnerability in the SSL VPN module of Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.” reads the security advisory published by the company. “This vulnerability is due to insufficient boundary checks when processing specific HTTP requests. An attacker could exploit this vulnerability by sending malicious HTTP requests to the affected device that is acting as an SSL VPN Gateway. A successful exploit could allow the attacker to execute code with root privileges on the affected device.”
The company also addressed two critical issues in the web-based management interface of the Small Business RV routers, tracked as CVE-2022-20700 (CVSS score of 10) and CVE-2022-20701 (CVSS score of 9.0) respectively.
An attacker could exploit the flaw to escalate privileges to root and execute arbitrary commands on the vulnerable device.
“These vulnerabilities are due to insufficient authorization enforcement mechanisms. An attacker could exploit these vulnerabilities by submitting specific commands to an affected device. A successful exploit could allow the attacker to elevate privileges to root and execute arbitrary commands on the affected system.” reads the advisory.
Other critical issues addressed by Cisco are a Command Injection vulnerability and a Digital Signature Verification Bypass vulnerability, respectively tracked as CVE-2022-20708 (CVSS score of 10.0) and CVE-2022-20703 (CVSS score of 9.3).
The advisory also includes details about various other high and medium-severity vulnerabilities in the Cisco Small Business routers.
An attacker can exploit the vulnerabilities to inject and execute arbitrary commands, cause a denial of service (DoS) condition, execute arbitrary code, obtain partial administrative privileges, view or alter information shared with other devices, overwrite certain files, upload arbitrary files, .
The company urges customers to install security updates for the impacted Cisco Small Business routers, it pointed out that there are no workarounds to address these issues.
The company is aware of the availability of public proof-of-concept (PoC) exploit code to trigger some of the vulnerabilities it has addressed.
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