CVE-2022-20699, CVE-2022-20700, CVE-2022-20708: Critical Flaws in Cisco Small Business RV Series Routers
Cisco patches 15 flaws in Cisco Small Business RV Series Routers, including three with critical 10.0 CVSSv3 scores.
Update February 4: Cisco has updated their advisory to announce partial patches for the RV160 and RV260 Series Routers. The Solution section has been updated with this information.
On February 2, Cisco published an advisory for 15 vulnerabilities in its Small Business RV Series Routers. Three of the 15 vulnerabilities listed in the advisory received a CVSSv3 score of 10.0, the highest possible rating.
|CVE-2022-20699||Remote Code Execution Vulnerability||10.0||CSCwa13836|
|CVE-2022-20700||Privilege Escalation Vulnerability||10.0||CSCwa14564, CSCwa14565|
|CVE-2022-20701||Privilege Escalation Vulnerability||9.0||CSCwa12836, CSCwa13119|
|CVE-2022-20702||Privilege Escalation Vulnerability||6.0||CSCwa15167, CSCwa15168|
|CVE-2022-20703||Digital Signature Verification Bypass Vulnerability||9.3||CSCwa12748, CSCwa13115|
|CVE-2022-20704||SSL Certificate Validation Vulnerability||4.8||CSCwa13205, CSCwa13682|
|CVE-2022-20705||Improper Session Management Vulnerability||5.3||CSCwa14601, CSCwa14602, CSCwa32432, CSCwa54598|
|CVE-2022-20706||Command Injection Vulnerability||8.3||CSCwa14007, CSCwa14008|
|CVE-2022-20709||Arbitrary File Upload||5.3||CSCwa13882|
|CVE-2022-20710||Denial of Service||5.3||CSCvz88279, CSCvz94704|
|CVE-2022-20711||Arbitrary File Overwrite||8.2||CSCwa13888|
|CVE-2022-20712||Remote Code Execution||7.3||CSCwa18769, CSCwa18770|
CVE-2022-20699 is a remote code execution (RCE) vulnerability in the Cisco RV340, RV340W, RV345 and RV345P Dual WAN Gigabit Routers. According to Cisco, the flaws exist due to an insufficient boundary check within the Secure Socket Layer Virtual Private Network (SSL VPN) module of these devices. A remote, unauthenticated attacker could exploit this flaw by sending a specially crafted HTTP request to a vulnerable device that is “acting as an SSL VPN Gateway.” Successful exploitation would grant an attacker arbitrary code execution on the device with root privileges.
CVE-2022-20700, CVE-2022-20701, CVE-2022-20702 are elevation of privilege vulnerabilities in the RV160, RV160W, RV260, RV260P, RV260W, RV340, RV340W, RV345 and RV345P routers. According to Cisco, these vulnerabilities reside in the web-based management interface of its Cisco Small Business RV Series Routers. The most severe of these three flaws is CVE-2022-20700. A remote, unauthenticated attacker could exploit this vulnerability by “submitting specific commands” to a vulnerable device. Successful exploitation would elevate the attacker’s privileges, allowing them to execute arbitrary commands as root.
CVE-2022-20707, CVE-2022-20708 and CVE-2022-20749 are RCE vulnerabilities in the Cisco RV340, RV340W, RV345 and RV345P Dual WAN Gigabit Routers. The most severe of these three flaws is CVE-2022-20708. According to Cisco, all three vulnerabilities reside in the web-based management interface of these devices. A remote, unauthenticated attacker could exploit these vulnerabilities by sending a specially crafted input to a vulnerable device. Successful exploitation would grant an attacker arbitrary command execution privileges at the operating system level.
At least 8,400 RV34X devices are publicly accessible
According to searches conducted on Shodan, there are at least 8,400* publicly accessible RV34X devices.
*These results were captured on February 2, 2022
Proof of concept
In its advisory, Cisco says they are aware of proofs-of-concept (PoC) exploits for several of the vulnerabilities patched. However, none of the PoCs were hosted on public repositories like GitHub at the time this blog was published.
Cisco has released fixes for all 15 vulnerabilities for the RV340 and RV345 Series Routers. For the RV160 and RV260 Series routers, five of the vulnerabilities have been addressed in firmware release 1.0.01.07. The Cisco advisory notes that the additional fixes are expected soon. We recommend referring to the advisory to stay up to date on additional patches and recommendations from Cisco.
|Product Identifier||Vulnerable Version||Fixed Version|
|RV160, RV160W, RV260, RV260P, RV260W||1.0.01.05 and below||1.0.01.07|
|RV340, RV340W, RV345 and RV345P||1.0.03.24||1.0.03.26 and above|
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