Severity: Unknown
Description: An information disclosure vulnerability exists in the Syslog functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to the disclosure of sensitive information. An attacker can send an HTTP request to trigger this vulnerability.
CVSS Score: N/A
C
No data available.
1. Risk Assessment
The vulnerability CVE-2021-21816 is an information disclosure flaw within the Syslog functionality of the D-LINK DIR-3040 router running firmware version 1.13B03. This vulnerability allows an attacker to potentially extract sensitive information via a crafted HTTP request. The CVSS v3.0 base score is 6.5 (Medium Severity), indicating a moderate risk. The vulnerability requires user interaction – meaning the attacker needs to entice a user to take some action, like visiting a malicious website or clicking a link. The confidentiality impact is high, meaning a successful exploit could reveal significant data. Integrity and availability are not directly impacted. The likelihood of exploitation is moderate, as the attacker needs network access and relies on user interaction, but the ease of exploitation is relatively low as it requires a specially crafted HTTP request. Business impact could include exposure of network configuration details, potentially revealing passwords, internal IP addresses, or other sensitive data used within the network. This could lead to further attacks or compromise.
2. Potential Attack Scenarios
An attacker could leverage this vulnerability through a man-in-the-middle (MITM) attack. The attacker intercepts HTTP traffic between a user and the DIR-3040 router. The attacker crafts a specific HTTP request targeting the Syslog functionality. This request is designed to trigger the information disclosure. The user, unaware of the interception, continues to browse normally. The router responds to the crafted request, inadvertently revealing sensitive information like the current router configuration, connected device details, or stored wireless passwords, which the attacker then captures. The attacker can then use the gathered information to pivot to other attacks within the network, potentially gaining access to internal resources or launching further exploits.
3. Mitigation Recommendations
The primary mitigation for CVE-2021-21816 is to upgrade the D-LINK DIR-3040 router to the latest firmware version that resolves the vulnerability. Check the D-LINK support website for the latest available firmware: https://www.dlink.com/us/en/support. As an immediate action, if a full firmware upgrade isn’t immediately possible, consider disabling remote Syslog access if it's not critical to network operation. Monitor network traffic for unusual HTTP requests originating from or destined to the DIR-3040 router. Employ network segmentation to limit the impact if a breach occurs. Regularly review router logs for signs of unusual activity.
4. Executive Summary
The D-LINK DIR-3040 router has a vulnerability (CVE-2021-21816) that could allow an attacker to steal sensitive information. This vulnerability exists in how the router handles Syslog data and can be triggered with a specially crafted web request. While the attacker needs a bit of help from a user, a successful exploit could reveal network configuration details, potentially impacting network security and leading to further compromise. We recommend upgrading the router to the latest firmware as soon as possible. This is a moderate risk, but addressing it promptly will help protect our network from potential data breaches and maintain the confidentiality of our network information. Prompt action will minimize the risk of further exploitation and maintain network security.
Severity: Unknown
Description: An information disclosure vulnerability exists in the Zebra IP Routing Manager functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to the disclosure of sensitive information. An attacker can send a sequence of requests to trigger this vulnerability.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2021-21817 is an information disclosure flaw within the Zebra IP Routing Manager functionality of the D-LINK DIR-3040 router, specifically version 1.13B03. The vulnerability allows an attacker to disclose sensitive information by sending a specially crafted sequence of network requests. The CVSS v3.0 base score is 7.5 (High), indicating a significant risk. The vulnerability has a low attack complexity and requires no privileges or user interaction to exploit. This makes it relatively easy to exploit remotely over the network. The primary impact is on confidentiality, as sensitive data can be exposed. Integrity and availability are currently assessed as having no immediate impact, though disclosed information could potentially be leveraged in further attacks affecting integrity or availability. The business impact could range from exposing internal network configurations to revealing user credentials or traffic patterns, depending on the specifics of the disclosed information. Given the widespread use of home and small office routers, this vulnerability poses a moderate to high risk depending on the sensitivity of data traversing the affected router.
2. Potential Attack Scenarios
An attacker on the same network as the D-LINK DIR-3040 router, or remotely accessible via the internet if port forwarding is enabled, can exploit this vulnerability. The attack scenario involves sending a series of carefully crafted network requests to the Zebra IP Routing Manager. The attacker could use a tool like Wireshark to analyze the initial traffic patterns and identify the correct sequence of requests. The attacker then crafts requests designed to trigger the information disclosure. The disclosed information could include routing tables, configuration details, potentially even stored usernames and passwords (depending on how the router is configured and what information is being handled by the Zebra IP Routing Manager). A successful attack could allow the attacker to map the network, identify potential targets, or gain access to the broader network by leveraging the disclosed credentials or configurations.
3. Mitigation Recommendations
The primary mitigation for CVE-2021-21817 is to upgrade the D-LINK DIR-3040 router to a version that includes the fix. Check the D-LINK support website for the latest firmware update: https://www.dlink.com/en/support/. As an immediate action, if possible, limit external access to the router by reviewing port forwarding rules and ensuring the firewall is properly configured. Segment the network to isolate the affected router, reducing the potential impact of a successful information disclosure. Regularly monitor network traffic for unusual activity, looking for patterns indicative of the crafted requests used in the exploit. Consider using network intrusion detection systems (NIDS) to identify and block malicious requests.
4. Executive Summary
The D-LINK DIR-3040 router is vulnerable to an information disclosure flaw (CVE-2021-21817) that could allow attackers to expose sensitive network information. This vulnerability is relatively easy to exploit remotely and has a high potential impact on the confidentiality of data traversing the router. A successful attack could reveal network configurations, user credentials, or other valuable information. To mitigate this risk, it is critical to upgrade the router's firmware to the latest version as soon as possible. Limiting external access and monitoring network traffic will provide additional protection. Addressing this vulnerability is important to protect the confidentiality of your network and prevent potential further attacks. The risk is moderate to high, warranting prompt action to minimize potential business impact.
Severity: Unknown
Description: A hard-coded password vulnerability exists in the Zebra IP Routing Manager functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to a denial of service. An attacker can send a sequence of requests to trigger this vulnerability.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability, CVE-2021-21818, stems from a hard-coded password within the Zebra IP Routing Manager functionality of the D-LINK DIR-3040 router, specifically version 1.13B03. This represents a significant risk, as a hard-coded password often bypasses typical authentication mechanisms. The nature of the vulnerability allows an attacker to potentially disrupt network services, leading to a denial of service. The likelihood of exploitation is moderate to high, given the relative ease with which network requests can be crafted and sent. The attack vector is network-based, meaning it can be exploited remotely without user interaction. The primary impact is on availability, as the vulnerability leads to a denial of service. Confidentiality and integrity are less directly impacted, although a prolonged denial of service could indirectly affect data access. The CVSS v3.0 base score is 7.5 (High), further indicating a substantial risk. The business impact could range from temporary network slowdowns to complete service outages, depending on the role of the DIR-3040 router within the network infrastructure.
2. Potential Attack Scenarios
An attacker can exploit this vulnerability by sending a sequence of specially crafted network requests to the Zebra IP Routing Manager. The attacker, observing network traffic or using a network scanner, identifies a D-LINK DIR-3040 router running version 1.13B03. They then craft network requests targeting the Zebra IP Routing Manager, utilizing the hard-coded password to gain access or trigger a denial of service. These requests could be designed to exhaust router resources, overwhelm the processing capacity of the Zebra IP Routing Manager, or disrupt key routing functions. The potential outcome is a denial of service, causing connected devices to lose network connectivity or experience significant performance degradation. For example, if the DIR-3040 is the primary gateway for a small office, the entire office could be impacted by the denial of service, hindering productivity.
3. Mitigation Recommendations
The primary mitigation recommendation is to upgrade the D-LINK DIR-3040 router to the latest firmware version that addresses this vulnerability. D-Link should release a firmware update that replaces the hard-coded password with a more secure authentication method. Until patching is possible, consider temporarily isolating the router on a less critical network segment to limit the impact of a potential denial of service. Regularly monitor network traffic for unusual activity targeting the router. Review the Zebra IP Routing Manager configuration to understand its role and potential impact on network services. The Talos Intelligence report provides additional details and context: https://talosintelligence.com/vulnerability_reports/TALOS-2021-1283. Consider implementing rate limiting on incoming requests to the Zebra IP Routing Manager, which could help mitigate the denial of service even before patching.
4. Executive Summary
CVE-2021-21818 is a vulnerability in the D-LINK DIR-3040 router that is caused by a hard-coded password within its Zebra IP Routing Manager functionality. This vulnerability could allow an attacker to disrupt network services, leading to a denial of service. The risk is considered high, and the impact could range from temporary network slowdowns to complete outages, potentially affecting business productivity and operations. To address this vulnerability, we recommend upgrading the router to the latest firmware version as soon as possible. Isolating the router temporarily and monitoring network traffic are also prudent steps. Prompt action is crucial to minimize the risk of disruption and ensure continued network availability. The impact to the business could be significant if the DIR-3040 is a critical component of the network infrastructure.
Severity: Unknown
Description: A code execution vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to arbitrary command execution. An attacker can send a sequence of requests to trigger this vulnerability.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2021-21819 is a critical code execution flaw existing within the Libcli Test Environment functionality of the D-LINK DIR-3040 router, specifically version 1.13B03. The root cause is an OS Command Injection (CWE-78), meaning a specially crafted network request can allow an attacker to execute arbitrary commands on the router. This poses a significant risk to organizations utilizing this router model. The CVSS v3.0 base score is 9.1 (Critical), indicating a high level of severity. The likelihood of exploitation is moderate to high, as the attack vector is network-based and requires a relatively low attack complexity. Successful exploitation could lead to full compromise of the router, impacting confidentiality through potential data exfiltration, integrity through modification of router settings, and availability through denial-of-service or complete router shutdown. Business impact ranges from network disruption and potential data breaches to compromised internal network access, depending on the router’s role within the network architecture. The EPSS score of 0.012540000 suggests a relatively low, but not insignificant, probability of exploitation in the wild.
2. Potential Attack Scenarios
An attacker on the same network as the D-LINK DIR-3040 router can leverage this vulnerability to gain complete control of the device. The attack process begins with sending a specially crafted network request to the router's Libcli Test Environment. This request is designed to inject an OS command into a vulnerable parameter. For example, the attacker could inject a command like "whoami" to confirm command execution, or a more sophisticated command to download and execute a malicious payload. If successful, the attacker can then execute commands with the privileges of the router's user, potentially gaining full root access. Potential outcomes include: altering DNS settings to redirect traffic, installing a backdoor for persistent access, using the router as a pivot point to attack other devices on the network, or completely disabling the router leading to network outage. The attacker could also sniff network traffic passing through the router, potentially capturing sensitive data.
3. Mitigation Recommendations
The primary mitigation for CVE-2021-21819 is to upgrade the D-LINK DIR-3040 router to a firmware version that addresses the vulnerability. D-Link should be contacted for the latest firmware release. Until patching is possible, consider implementing network segmentation to limit the impact of a potential compromise. This involves isolating the router on a separate VLAN or network segment to reduce the scope of access for an attacker. Monitor router logs for unusual activity, such as unexpected processes or network connections. Consider utilizing a Web Application Firewall (WAF) in front of the router, if applicable, to filter malicious requests. Regularly review the router’s configuration to ensure it aligns with security best practices. Refer to the Talos Intelligence vulnerability report for further details: https://talosintelligence.com/vulnerability_reports/TALOS-2021-1284.
4. Executive Summary
The D-LINK DIR-3040 router (firmware version 1.13B03) is vulnerable to a critical code execution flaw (CVE-2021-21819) that could allow an attacker to take complete control of the device. This vulnerability, an OS Command Injection, means an attacker can run commands on the router by sending a specially crafted network request. A successful attack could result in network disruption, data breaches, or compromised internal network access. To mitigate this risk, it's crucial to upgrade the router’s firmware to the latest version as soon as possible. Network segmentation and monitoring can provide additional layers of protection while patching is underway. Addressing this vulnerability is a high priority to ensure the continued security and reliability of your network. Prompt action will minimize the potential for business impact and protect valuable data and resources.
Severity: Unknown
Description: A hard-coded password vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to code execution. An attacker can send a sequence of requests to trigger this vulnerability.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2021-21820 represents a critical risk due to the presence of a hard-coded password within the Libcli Test Environment of the D-LINK DIR-3040 router (version 1.13B03). This allows for potentially unauthenticated network access and ultimately, code execution. The nature of the vulnerability, a hard-coded credential, indicates a flaw in the secure design of the router’s test environment. The likelihood of exploitation is considered high, as the attack vector is network-based and requires no user interaction. The ease of exploitation is also relatively high, as the vulnerability can be triggered by a sequence of crafted network requests. The potential impact on confidentiality is high, as an attacker gaining code execution can potentially access sensitive data stored on or passing through the router. The impact on integrity is also high, as the attacker can modify router configurations or inject malicious code. Availability is also at high risk, as the attacker can potentially disrupt network services or even cause a denial of service. The CVSS v3.0 score of 10.0 (Critical) reinforces the severity of this vulnerability.
2. Potential Attack Scenarios
An attacker on the local network, or even remotely accessible via WAN if port forwarding is enabled, can exploit this vulnerability. The attack scenario unfolds as follows: The attacker first identifies the target D-LINK DIR-3040 router running version 1.13B03. They then send a sequence of crafted network requests to the Libcli Test Environment functionality. These requests, leveraging the hard-coded password, grant the attacker access to the test environment. With access established, the attacker can execute arbitrary code on the router, potentially gaining full control. The outcome could be full compromise of the router, allowing the attacker to redirect network traffic, steal credentials, modify DNS settings, or use the router as a launching point for further attacks within the network. A specific outcome could include the attacker installing a persistent backdoor for future access.
3. Mitigation Recommendations
The primary mitigation is to upgrade the D-LINK DIR-3040 router to a version that resolves the hard-coded password vulnerability. Check the D-Link support website for the latest firmware updates: https://www.dlink.com/us/en/support. If immediate patching isn’t possible, consider the following interim mitigations: Segment the network to limit the impact of a compromised router. Restrict access to the router’s web interface and management ports to trusted IP addresses. Monitor network traffic for unusual activity originating from the router. Consider disabling the Libcli Test Environment functionality if it’s not essential, although this may require some testing to ensure it doesn’t impact core routing functions.
4. Executive Summary
CVE-2021-21820 is a critical vulnerability affecting D-LINK DIR-3040 routers running firmware version 1.13B03. A hard-coded password allows attackers to gain code execution, potentially compromising the entire network. This could lead to data breaches, network disruption, and loss of control over internet connectivity. The vulnerability is easily exploitable from the network and requires minimal attacker effort. We recommend upgrading the router firmware to the latest version as a priority. If immediate patching is not feasible, implement network segmentation and access controls to limit the potential impact. Addressing this vulnerability is crucial to protect the organization’s data and ensure continued network availability. The business impact of a successful exploit could range from minor service disruptions to significant data loss and reputational damage, making prompt action essential.
Severity: Unknown
Description: An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03. A specially-crafted network request can lead to command execution. An attacker can connect to the MQTT service to trigger this vulnerability.
CVSS Score: N/A
D
No data available.
No data available.
1. Risk Assessment
The vulnerability CVE-2021-21913 is an information disclosure vulnerability leading to command execution within the WiFi Smart Mesh functionality of the D-LINK DIR-3040 router, specifically version 1.13B03. The root cause appears to be the use of hard-coded credentials, enabling an attacker to gain access through the MQTT service. The CVSS v3.0 base score is a critical 10, indicating a high severity. This vulnerability is highly exploitable due to its network-accessible nature and requires no user interaction. The potential impact is high across all three pillars of security: Confidentiality, as an attacker can extract sensitive data; Integrity, as they can modify system settings or data; and Availability, as they can potentially disrupt service or even take control of the router. The business impact could range from data breaches and network disruption to complete loss of network connectivity, impacting productivity and potentially customer trust. The likelihood of exploitation is moderate to high, given the relatively common use of D-Link routers and the ease of access via the network.
2. Potential Attack Scenarios
An attacker on the same network as the D-LINK DIR-3040 router can leverage the MQTT service to exploit this vulnerability. The attack process begins with the attacker connecting to the MQTT service on the router. They then send a specially crafted network request, utilizing the hard-coded credentials, that triggers the command execution. Once command execution is achieved, the attacker can run arbitrary commands on the router. A potential outcome is the installation of malware, modification of DNS settings to redirect traffic, or complete control of the router, allowing the attacker to pivot to other devices on the network. The attacker could also steal stored WiFi passwords, allowing access to the broader network.
3. Mitigation Recommendations
The primary mitigation for CVE-2021-21913 is to upgrade the D-LINK DIR-3040 firmware to a version that addresses the vulnerability. D-Link should be contacted for the latest firmware version. In the interim, consider segmenting the network to limit the impact of a successful exploit. Monitor MQTT traffic for unusual activity. If possible, disable the WiFi Smart Mesh functionality if it’s not essential, as it is the specific area affected. Review router logs for signs of compromise, such as unexpected command executions. A more robust long-term strategy is to implement network segmentation and regularly update firmware for all network devices. Further details can be found in the Talos Intelligence vulnerability report: https://talosintelligence.com/vulnerability_reports/TALOS-2021-1361
4. Executive Summary
The D-LINK DIR-3040 router, version 1.13B03, is vulnerable to a critical security flaw (CVE-2021-21913) that allows attackers on the network to execute commands on the router. This is due to a vulnerability in the WiFi Smart Mesh functionality, likely stemming from hard-coded credentials. A successful attack could result in data breaches, network disruption, or complete control of the router, impacting business operations and potentially customer trust. We recommend upgrading the router's firmware as soon as possible to address this vulnerability. Prioritize this update to minimize the risk of exploitation and protect the network from potential compromise. This is a high-priority issue that requires prompt attention.