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Executive Summary
CVE-2019-1622 is a critical vulnerability identified in the web-based management interface of Cisco Data Center Network Manager (DCNM). This vulnerability allows unauthenticated, remote attackers to retrieve sensitive information from affected devices. The flaw arises due to improper access controls for specific URLs within the DCNM software. Exploiting this vulnerability can enable attackers to download log files and diagnostic information, potentially leading to further security breaches. This report delves into the technical specifics of CVE-2019-1622, its exploitation in the wild, affected product versions, and recommended mitigation strategies.
Technical Information
CVE-2019-1622 was published on June 26, 2019, and last modified on October 6, 2020. It has a CVSS v3.1 base score of 5.3, categorizing it as a medium-severity vulnerability. The vulnerability is identified by the Common Weakness Enumeration (CWE) as CWE-284 (Improper Access Control) and CWE-532 (Insertion of Sensitive Information into Log File). The primary issue lies in the improper access controls for certain URLs on the affected DCNM software, which allows unauthenticated, remote attackers to retrieve sensitive information.
The vulnerability affects Cisco Data Center Network Manager (DCNM) versions 11.1(1) and below. Attackers can exploit this vulnerability by connecting to the web-based management interface of an affected device and requesting specific URLs. A successful exploit could allow the attacker to download log files and diagnostic information from the affected device, which may contain sensitive information.
The attack vector is network-based, with a low attack complexity, no privileges required, and no user interaction needed. The scope is unchanged, meaning the impact is confined to the vulnerable component. The confidentiality impact is low, while the integrity and availability impacts are none.
Exploitation in the Wild
CVE-2019-1622 has been actively discussed in various security forums and has been exploited in the wild. Attackers have leveraged this vulnerability to gain unauthorized access to sensitive information stored in log files and diagnostic data. Specific instances of exploitation include unauthorized HTTP requests to specific URLs on the DCNM web-based management interface, leading to the retrieval of sensitive information.
Indicators of Compromise (IOCs) include unusual access to log files and diagnostic data, as well as unauthorized HTTP requests to specific URLs on the DCNM web-based management interface. Security teams should monitor for these IOCs to detect potential exploitation of this vulnerability.
APT Groups using this vulnerability
While there is no specific attribution to Advanced Persistent Threat (APT) groups exploiting CVE-2019-1622, the nature of the vulnerability makes it a valuable target for APT groups seeking to gather sensitive information from compromised networks. Organizations in sectors such as telecommunications, finance, and government should be particularly vigilant, as these sectors are often targeted by APT groups.
Affected Product Versions
The affected product versions are Cisco Data Center Network Manager (DCNM) versions 11.1(1) and below. Organizations using these versions should prioritize upgrading to the latest version to mitigate the risk of exploitation.
Workaround and Mitigation
Cisco has released software updates that address this vulnerability. Users are advised to upgrade to the latest version of Cisco Data Center Network Manager. Additionally, network administrators should implement proper access controls and monitor network traffic for any suspicious activities. Specific mitigation steps include:
- Upgrading to the latest version of Cisco DCNM.
- Implementing strict access controls to limit access to the DCNM web-based management interface.
- Monitoring network traffic for unusual access patterns to log files and diagnostic data.
- Applying security patches and updates as soon as they are released by Cisco.
For detailed mitigation steps, refer to the Cisco Security Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-infodiscl
References
For further reading and technical details, refer to the following resources:
- Metasploit Framework: https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/cisco_dcnm_upload_2019.rb
- Exploit-DB: https://www.exploit-db.com/exploits/47347
- GitHub PoC: https://github.com/pedrib/PoC/blob/master/advisories/Cisco/cisco-dcnm-rce.txt
- Cisco Security Advisory: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190626-dcnm-infodiscl
Rescana is here for you
At Rescana, we are committed to helping our customers navigate the complex landscape of cybersecurity threats. Our Continuous Threat and Exposure Management (CTEM) platform provides comprehensive monitoring and mitigation strategies to protect your organization from vulnerabilities like CVE-2019-1622. If you have any questions about this report or any other cybersecurity concerns, please do not hesitate to contact us at ops@rescana.com. We are here to support you in safeguarding your digital assets.
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