Summary

• Multiple vulnerabilities in the Universal Plug and Play (UPnP) service and the web-based management interface of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers could allow a remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly.

  For more information about these vulnerabilities, see the Details section of this advisory.

  Cisco has not released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-overflow-WUnUgv4U

Affected Products

• Vulnerable Products

  These vulnerabilities affect the following Cisco Small Business routers:

  • RV110W Wireless-N VPN Firewall
  • RV130 VPN Router
  • RV130W Wireless-N Multifunction VPN Router
  • RV215W Wireless-N VPN Router

  The web-based management interface of these devices is available through a local LAN connection, which cannot be disabled, or through the WAN connection if the remote management feature is enabled. By default, the remote management feature is disabled for these devices.

  Determine the Device Configuration

  To determine whether the remote management feature is enabled for a device, open the web-based management interface and choose Basic Settings > Remote Management. If the Enable box is checked, remote management is enabled for the device.

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.

Details

• The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.

  Details about the vulnerabilities are as follows.

  Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers UPnP Remote Command Execution and Denial of Service Vulnerability

  A vulnerability in the Universal Plug and Play (UPnP) service of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an unauthenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly.

  The vulnerability is due to improper validation of incoming UPnP traffic. An attacker could exploit this vulnerability by sending a crafted UPnP request to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition.

  Cisco has not released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCvv79107, CSCvv79109, and CSCvv79110
  CVE ID: CVE-2021-1164
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.8
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Management Interface Remote Command Execution and Denial of Service Vulnerabilities

  Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an authenticated, remote attacker with valid administrator credentials to execute arbitrary code or cause an affected device to restart unexpectedly.

  The vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on the affected device.

  Cisco has not released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

  Bug ID(s): CSCvv96742, CSCvv96741, CSCvv96738, CSCvv96733, CSCvv96732, CSCvv96729, CSCvv96730, CSCvw10473, CSCvw10487, CSCvw10484, CSCvw04678, CSCvw04779, CSCvw04781, CSCvv96765, CSCvv96767, CSCvv96764, CSCvv96756, CSCvv96755, CSCvv96751, CSCvv96748, CSCvv96747, CSCvv96772, CSCvv96771, CSCvv96768, CSCvv96763, CSCvv96762, CSCvv96761, CSCvv96757, CSCvv96820, CSCvv96758, CSCvv96759, CSCvv96812, CSCvv96814, CSCvv96811, CSCvv96810, CSCvv96809, CSCvv96806, CSCvv96799, CSCvv96800, CSCvv96801, CSCvv96807, CSCvw06978, CSCvw06865, CSCvw06971, CSCvw06860, CSCvw06967, CSCvw06852, CSCvw06962, CSCvw06846, CSCvw06841, CSCvw06961, CSCvw06832, CSCvw06958, CSCvv96817, CSCvv96818, CSCvw06813, CSCvw06902, CSCvw06828, CSCvw06950, CSCvv71466, CSCvv71463, CSCvv69398, CSCvw49030, CSCvw49036, CSCvw49034, CSCvv71467, CSCvv71468, CSCvv65098, CSCvw07002, CSCvw06900, CSCvw06998, CSCvw06894, CSCvw06993, CSCvw06882, CSCvw06868, CSCvw06981, CSCvw06873, CSCvw06982, CSCvw06987, CSCvw06874, CSCvw06879, CSCvw06991, CSCvw06880, CSCvw06992, CSCvw76488, and CSCvw91642
  CVE ID(s): CVE-2021-1209, CVE-2021-1207, CVE-2021-1167, CVE-2021-1208, CVE-2021-1360, CVE-2021-1168, CVE-2021-1204, CVE-2021-1173, CVE-2021-1187, CVE-2021-1161, CVE-2021-1198, CVE-2021-1182, CVE-2021-1211, CVE-2021-1163, CVE-2021-1171, CVE-2021-1188, CVE-2021-1189, CVE-2021-1159, CVE-2021-1192, CVE-2021-1184, CVE-2021-1216, CVE-2021-1177, CVE-2021-1210, CVE-2021-1170, CVE-2021-1174, CVE-2021-1200, CVE-2021-1195, CVE-2021-1215, CVE-2021-1205, CVE-2021-1201, CVE-2021-1196, CVE-2021-1175, CVE-2021-1179, CVE-2021-1191, CVE-2021-1169, CVE-2021-1307, CVE-2021-1212, CVE-2021-1180, CVE-2021-1190, CVE-2021-1185, CVE-2021-1176, CVE-2021-1172, CVE-2021-1183, CVE-2021-1166, CVE-2021-1194, CVE-2021-1203, CVE-2021-1206, CVE-2021-1178, CVE-2021-1214, CVE-2021-1217, CVE-2021-1186, CVE-2021-1165, CVE-2021-1197, CVE-2021-1160, CVE-2021-1181, CVE-2021-1162, CVE-2021-1199, CVE-2021-1213, CVE-2021-1193, and CVE-2021-1202
  Security Impact Rating (SIR): High
  CVSS Base Score: 7.2
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Workarounds

• There are no workarounds that address these vulnerabilities.

Fixed Software

• Cisco has not released and will not release software updates to address the vulnerabilities described in this advisory. The Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers have entered the end-of-life process. Customers are advised to refer to the end-of-life notices for these products:

  End-of-Sale and End-of-Life Announcement for the Cisco Small Business RV Series Routers (selected models)

  Customers are encouraged to migrate to the Cisco Small Business RV132W, RV160, or RV160W Routers.

  When considering a device migration, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that new device will be sufficient for their network needs; new devices contain sufficient memory, and current hardware and software configurations will continue to be supported properly by the new product. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory.

Source

• Cisco would like to thank the following people for reporting these vulnerabilities:

  • ADLab of Venustech: CVE-2021-1168, CVE-2021-1197, CVE-2021-1198, CVE-2021-1199, CVE-2021-1200, CVE-2021-1201, CVE-2021-1202, CVE-2021-1205, CVE-2021-1206, CVE-2021-1210, CVE-2021-1211, CVE-2021-1212, CVE-2021-1213, CVE-2021-1214, CVE-2021-1215, CVE-2021-1216, and CVE-2021-1217
  • Kai Cheng of the Institute of Information Engineering, Chinese Academy of Sciences: CVE-2021-1159, CVE-2021-1160, CVE-2021-1161, CVE-2021-1162, CVE-2021-1163, CVE-2021-1165, CVE-2021-1166, CVE-2021-1169, CVE-2021-1170, CVE-2021-1171, CVE-2021-1172, CVE-2021-1173, CVE-2021-1174, CVE-2021-1175, CVE-2021-1176, CVE-2021-1177, CVE-2021-1178, CVE-2021-1179, CVE-2021-1180, CVE-2021-1181, CVE-2021-1182, CVE-2021-1183, CVE-2021-1184, CVE-2021-1185, CVE-2021-1186, CVE-2021-1187, CVE-2021-1188, CVE-2021-1189, CVE-2021-1190, CVE-2021-1191, CVE-2021-1192, CVE-2021-1193, CVE-2021-1194, CVE-2021-1195, CVE-2021-1196, CVE-2021-1203, and CVE-2021-1204
  • Shizhi He of Wuhan University: CVE-2021-1167 and CVE-2021-1208
  • Simp1e of 1AQ Team: CVE-2021-1207, CVE-2021-1209, and CVE-2021-1307
  • Swings of Chaitin Security Research Lab: CVE-2021-1207, CVE-2021-1209, CVE-2021-1164, and CVE-2021-1307
  • Treck Zhou and Ares. Pan: CVE-2021-1164 and CVE-2021-1360

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-overflow-WUnUgv4U

Revision History

• Version	Description	Section	Status	Date
  2.0	Changed advisory SIR from High to Critical. Updated the advisory title. Added a Details section. Changed the description and updated the CVSS score and SIR for CVE-2021-1164.	Title, Header (SIR and CVSS score), Summary, and Details	Final	2021-JAN-19
  1.1	Updated external researcher information.	Source	Final	2021-JAN-14
  1.0	Initial public release.	-	Final	2021-JAN-13

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