A vulnerability in the implementation of IPv6 VPN over MPLS (6VPE) with Zone-Based Firewall (ZBFW) of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling of an IPv6 packet that is forwarded from an MPLS and ZBFW-enabled interface in a 6VPE deployment. An attacker could exploit this vulnerability by sending a crafted IPv6 packet sourced from a device on the IPv6-enabled virtual routing and forwarding (VRF) interface through the affected device. A successful exploit could allow the attacker to reload the device, resulting in a DoS condition.
The CVSS score for this vulnerability is 7.4, indicating a high severity level. This rating highlights the potential impact such an exploit could have on organizational operations, as it can lead to significant downtime and disruption. Organizations utilizing Cisco IOS XE should prioritize addressing this vulnerability due to the associated risks.
Currently, there is no public exploit confirmed, but the availability of this vulnerability in an adjacent network could pose a significant risk if not mitigated. Organizations should prioritize patching immediately to protect their infrastructures from potential exploitation.
In summary, the urgency for defenders is clear. Organizations using affected versions of Cisco IOS XE must act swiftly to implement patches and secure their systems against potential denial-of-service attacks.
Vulnerability Details
Officially, this vulnerability allows an unauthenticated, adjacent attacker to cause a denial of service condition. It is classified under CWE-115 and CWE-436, indicating issues related to improper error handling and design flaws.
The CVSS score for this vulnerability is 7.4, categorized as high severity. This high score denotes that the vulnerability can be exploited with low complexity and without requiring any privileges or user interaction. The primary impact of this vulnerability is on the availability of the affected device.
The affected product is Cisco IOS XE, specifically the versions deployed with IPv6 VPN over MPLS (6VPE) and Zone-Based Firewall (ZBFW). The vulnerability was published on October 10, 2022.
Technical Analysis
The root cause of this vulnerability lies in the improper error handling of IPv6 packets. When a malformed IPv6 packet is forwarded from an MPLS and ZBFW-enabled interface, it can trigger a device reload, leading to a denial of service. The attack vector for this vulnerability is local, requiring an attacker to be on the adjacent network.
The attack complexity is low since it does not require any special privileges or user interaction. An attacker merely needs to send a crafted packet from a device within the same IPv6-enabled virtual routing and forwarding interface.
The potential impacts of this vulnerability are significant, primarily affecting the availability of the affected device. Confidentiality and integrity impacts are noted as none; however, the overall availability impact is rated as high.
Risk & Impact Analysis
The risk to organizations includes potential downtime and loss of service availability. Given that this vulnerability can be exploited by an adjacent attacker, the blast radius is limited to local networks but can still have significant operational consequences.
Organizations utilizing Cisco IOS XE must assess their exposure to this vulnerability. The low attack complexity combined with the potential for high impact makes this a critical priority for patching. Organizations should address in priority patch cycle to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is Cisco IOS XE, specifically all versions prior to the vendor patch.
Mitigation & Remediation
Organizations should prioritize patching immediately. Cisco has released patches that address this vulnerability. For further information on security testing and validation, refer to penetration testing to confirm the effectiveness of the applied patches.
Detection Guidance
Monitoring for unusual device reboots and logs that indicate denial of service events can help detect exploitation attempts. Regular audits and log reviews should be conducted to identify any behavioral anomalies.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-20915 illustrates the importance of robust error handling in network protocols. This pattern of vulnerabilities often highlights weaknesses in fundamental design choices, prompting organizations to review system architectures for potential improvements.
By learning from incidents like this, security teams can bolster defenses against future vulnerabilities. For further insights into vulnerability management, consider reviewing our vulnerability management program and our guide on penetration testing methodology to ensure comprehensive protection.
Lastly, organizations should consider engaging in API security testing as part of their overall security strategy.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)