A vulnerability in the health check RPM of Cisco IOS XR Software could allow an unauthenticated, remote attacker to access the Redis instance that is running within the NOSi container. This vulnerability exists because the health check RPM opens TCP port 6379 by default upon activation. An attacker could exploit this vulnerability by connecting to the Redis instance on the open port. A successful exploit could allow the attacker to write to the Redis in-memory database, write arbitrary files to the container filesystem, and retrieve information about the Redis database. Given the configuration of the sandboxed container that the Redis instance runs in, a remote attacker would be unable to execute remote code or abuse the integrity of the Cisco IOS XR Software host system.
The severity of this vulnerability is rated as medium, with a CVSS score of 6.5. This score indicates that while the potential for exploitation exists, the impact is somewhat limited due to the sandboxing of the Redis instance. Organizations running affected versions of Cisco IOS XR should prioritize remediation efforts, especially given the potential for data exfiltration from the Redis database.
It is crucial for organizations to understand the risks associated with this vulnerability. Attackers may leverage this weakness to gain unauthorized access to sensitive data stored within the Redis database. Therefore, immediate attention to patching and securing the affected systems is warranted.
Organizations should address this vulnerability in their priority patch cycle to ensure the security of their network infrastructure. The risk includes potential unauthorized access to sensitive information and the ability to manipulate the Redis database, which could lead to further exploitation.
Vulnerability Details
The vulnerability in question allows unauthenticated remote access to the Redis instance due to the default opening of TCP port 6379 by the health check RPM of Cisco IOS XR Software. The CVE was officially published on May 26, 2022, and has a CVSS score of 6.5, indicating a medium severity level. The CWE classification for this vulnerability is CWE-200 (Information Exposure).
Technical Analysis
The root cause of this vulnerability stems from the health check RPM's configuration, which opens a TCP port without adequate security controls. The attack vector is network-based, allowing remote attackers to connect without authentication. The attack complexity is low, requiring no special privileges or user interaction, making exploitation straightforward. The potential impacts include low confidentiality and integrity, but no availability impact, as the Redis service remains operational.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is significant as it allows unauthorized access to sensitive data stored in the Redis database. Given that many organizations utilize Redis for caching and data storage, the exposure of this data could lead to serious security incidents. Organizations must assess the potential blast radius of this vulnerability and prioritize patching based on their risk tolerance and operational needs.
Considering the CVSS score of 6.5, organizations should schedule remediation efforts as part of their prioritized patch cycle. The risk of data exposure necessitates immediate action to mitigate potential breaches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected product is Cisco IOS XR, which is vulnerable if configured with the default settings that enable TCP port 6379. Organizations should verify their configurations and ensure they are running the latest patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations are advised to apply patches provided by Cisco to remediate this vulnerability. It is crucial to upgrade to the latest version of Cisco IOS XR to ensure that TCP port 6379 is not left open by default. If immediate patching is not possible, organizations should implement network controls to restrict access to this port. Additionally, monitoring and logging should be enhanced to detect any unauthorized access attempts.
For further guidance on security testing, organizations can refer to the penetration testing services offered by AppSecure.
Detection Guidance
Organizations should monitor logs for unusual access patterns to the Redis instance, particularly on TCP port 6379. Behavioral anomalies that indicate unauthorized access attempts should also be tracked. Network signatures for potential exploit attempts can be established to preemptively identify malicious activities.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-20821 highlights a trend where default configurations can expose critical services to unauthorized access. Security teams should take lessons from this vulnerability to implement stricter security controls around service configurations. A strategic takeaway is the importance of regularly reviewing and updating configurations to minimize exposure to risks.
For insights on vulnerability management programs, organizations can explore the vulnerability management program design and its importance in proactively addressing vulnerabilities.
Additionally, exploring the penetration testing methodology can provide valuable insights into securing systems against similar vulnerabilities.
Finally, organizations should consider the insights from the API security best practices to enhance their overall security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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