The implementation of PEAP in wpa_supplicant through 2.10 allows authentication bypass. For a successful attack, wpa_supplicant must be configured to not verify the network's TLS certificate during Phase 1 authentication, and an eap_peap_decrypt vulnerability can then be abused to skip Phase 2 authentication. The attack vector is sending an EAP-TLV Success packet instead of starting Phase 2. This allows an adversary to impersonate Enterprise Wi-Fi networks.
This vulnerability has been classified with a CVSS score of 6.5, reflecting its medium severity. Organizations utilizing affected systems are at risk of unauthorized access due to misconfigured wpa_supplicant instances. The urgency for defenders is significant, as the potential impact on confidentiality is high.
Organizations should prioritize patching immediately. The availability of an exploit, confirmed through GitHub repositories, amplifies the need for urgency in addressing this vulnerability.
The vulnerability has been reported as modified, indicating that the situation may evolve. Continuous monitoring and prompt remediation efforts are essential to safeguard against potential exploitation.
Vulnerability Details
The implementation of PEAP in wpa_supplicant through version 2.10 allows for an authentication bypass. For a successful attack, wpa_supplicant must not verify the network's TLS certificate during Phase 1 authentication. Additionally, the eap_peap_decrypt vulnerability can be abused to skip Phase 2 authentication. The attack vector involves sending an EAP-TLV Success packet instead of initiating Phase 2.
The CVSS score of 6.5 categorizes this vulnerability as medium severity, with a high impact on confidentiality. The vulnerability affects several distributions, notably Debian and Fedora, as well as wpa_supplicant itself.
Technical Analysis
The root cause of this vulnerability lies in the configuration of wpa_supplicant, which must be set to not verify TLS certificates. When this configuration is in place, it permits attackers to exploit the eap_peap_decrypt vulnerability, allowing them to send an EAP-TLV Success packet to bypass Phase 2 authentication.
The attack vector for this vulnerability is classified as network-based, requiring low complexity and no privileges for execution. User interaction is a prerequisite, as the attacker must entice the victim to connect to a malicious network pretending to be a legitimate Enterprise Wi-Fi.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive data and potential network breaches. The blast radius could be significant, especially in environments where sensitive information is transmitted over Wi-Fi. Organizations should be aware of the high confidentiality impact and the potential for data exfiltration.
Given the CVSS score of 6.5, organizations should address this vulnerability in their priority patch cycle. The existence of an exploit, as indicated by the associated GitHub repository, further emphasizes the urgency of remediation efforts.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions are affected by this vulnerability:
1. Debian Linux 10.0 and later versions before the patch.
2. Fedora 38 and 39.
3. Red Hat Enterprise Linux 8.0 and 9.0.
Mitigation & Remediation
Organizations should prioritize applying the latest patches from their respective distributions. For Debian, Fedora, and Red Hat users, updates are available to resolve this vulnerability. Configuring wpa_supplicant to verify TLS certificates is crucial to prevent exploitation.
For further details on patching, organizations can refer to the following resources: penetration testing services that can help validate the implementation.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor for unusual EAP-TLV Success packets in their network traffic. Additionally, log indicators from wpa_supplicant can provide insights into unauthorized access attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to compromise Enterprise Wi-Fi security. It highlights a trend of vulnerabilities in authentication protocols that organizations must address proactively.
Security teams need to learn from such vulnerabilities and implement strict configurations for critical network services. Regular audits and penetration testing can help identify weaknesses before they are exploited.
For more insights on vulnerability management, organizations can refer to our resource on vulnerability management programs and best practices.
Additionally, reviewing our penetration testing methodology can enhance your organization's defenses.
Finally, engaging in continuous security assessments through continuous penetration testing can provide ongoing assurance against such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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