CVE-2023-31127
CVE-2023-31127
Weakness (CWE)
CVSS Vector
v3.1- Attack Vector
- Adjacent
- Attack Complexity
- Low
- Privileges Required
- Low
- User Interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Description
libspdm is a sample implementation that follows the DMTF SPDM specifications. A vulnerability has been identified in SPDM session establishment in libspdm prior to version 2.3.1. If a device supports both DHE session and PSK session with mutual authentication, the attacker may be able to establish the session with `KEY_EXCHANGE` and `PSK_FINISH` to bypass the mutual authentication. This is most likely to happen when the Requester begins a session using one method (DHE, for example) and then uses the other method's finish (PSK_FINISH in this example) to establish the session. The session hashes would be expected to fail in this case, but the condition was not detected. This issue only impacts the SPDM responder, which supports `KEY_EX_CAP=1 and `PSK_CAP=10b` at same time with mutual authentication requirement. The SPDM requester is not impacted. The SPDM responder is not impacted if `KEY_EX_CAP=0` or `PSK_CAP=0` or `PSK_CAP=01b`. The SPDM responder is not impacted if mutual authentication is not required. libspdm 1.0, 2.0, 2.1, 2.2, 2.3 are all impacted. Older branches are not maintained, but users of the 2.3 branch may receive a patch in version 2.3.2. The SPDM specification (DSP0274) does not contain this vulnerability.
Comprehensive Technical Analysis of CVE-2023-31127
1. Vulnerability Assessment and Severity Evaluation
CVE ID: CVE-2023-31127 CVSS Score: 9
Severity Evaluation: The CVSS score of 9 indicates a critical vulnerability. This high score is due to the potential for an attacker to bypass mutual authentication mechanisms, which can lead to significant security breaches. The vulnerability allows an attacker to manipulate the session establishment process, compromising the integrity and confidentiality of communications.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Session Manipulation: An attacker can exploit the vulnerability by initiating a session using one method (e.g., DHE) and then switching to another method's finish (e.g., PSK_FINISH) to bypass mutual authentication.
- Man-in-the-Middle (MitM) Attacks: The attacker can intercept and manipulate the session establishment process, potentially leading to unauthorized access or data interception.
Exploitation Methods:
- Session Hijacking: By exploiting the vulnerability, an attacker can hijack an ongoing session, allowing them to impersonate a legitimate user or device.
- Authentication Bypass: The attacker can bypass the mutual authentication process, gaining unauthorized access to the system or network.
3. Affected Systems and Software Versions
Affected Software Versions:
- libspdm versions 1.0, 2.0, 2.1, 2.2, and 2.3
Affected Systems:
- Systems and devices that use libspdm for SPDM session establishment and support both DHE and PSK sessions with mutual authentication.
- Systems where the SPDM responder supports
KEY_EX_CAP=1andPSK_CAP=10bsimultaneously with a mutual authentication requirement.
Unaffected Systems:
- Systems where the SPDM responder does not support
KEY_EX_CAP=1orPSK_CAP=10bor does not require mutual authentication. - Systems using libspdm versions 2.3.1 and later.
4. Recommended Mitigation Strategies
Immediate Actions:
- Patching: Upgrade to libspdm version 2.3.1 or later, which includes the necessary patches to mitigate this vulnerability.
- Configuration Review: Ensure that the SPDM responder is configured correctly to avoid supporting both
KEY_EX_CAP=1andPSK_CAP=10bsimultaneously if mutual authentication is required.
Long-Term Strategies:
- Regular Updates: Implement a regular update and patch management process to ensure that all software components are up-to-date.
- Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential security risks.
- Network Monitoring: Implement robust network monitoring and intrusion detection systems to detect and respond to suspicious activities.
5. Impact on Cybersecurity Landscape
Immediate Impact:
- Compromised Authentication: The vulnerability can lead to compromised authentication mechanisms, allowing attackers to gain unauthorized access to systems and networks.
- Data Breaches: The potential for data interception and unauthorized access can result in significant data breaches, impacting confidentiality and integrity.
Long-Term Impact:
- Trust Erosion: The vulnerability can erode trust in the security of SPDM implementations, affecting the adoption and deployment of SPDM-based solutions.
- Increased Attack Surface: The exposure of this vulnerability can increase the attack surface, making systems and networks more susceptible to future attacks.
6. Technical Details for Security Professionals
Vulnerability Details:
- Root Cause: The vulnerability arises from a flaw in the session establishment process where the condition for session hash failure is not detected when switching between DHE and PSK sessions.
- Technical Impact: The attacker can manipulate the session establishment process to bypass mutual authentication, leading to unauthorized access and potential data breaches.
Mitigation Steps:
- Code Review: Conduct a thorough code review of the session establishment process to ensure that all conditions for session hash failure are correctly detected and handled.
- Testing: Implement comprehensive testing procedures to validate the session establishment process and ensure that mutual authentication mechanisms are robust.
References:
By addressing this vulnerability promptly and implementing robust mitigation strategies, organizations can enhance their security posture and protect against potential exploitation.