Description: Picotls is a TLS protocol library that allows users select different crypto backends based on their use case. When parsing a spoofed TLS handshake message, picotls (specifically, bindings within picotls that call the crypto libraries) may attempt to free the same memory twice. This double free occurs during the disposal of multiple objects without any intervening calls to malloc Typically, this triggers the malloc implementation to detect the error and abort the process. However, depending on the internals of malloc and the crypto backend being used, the flaw could potentially lead to a use-after-free scenario, which might allow for arbitrary code execution. The vulnerability is addressed with commit 9b88159ce763d680e4a13b6e8f3171ae923a535d.
CVE-2024-45402
CVSS Score: 8.6 (HIGH)
EPSS Score: N/A
Risk Score: N/A
Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.
Mitre ATT&CK Technical v15.1
T1053.002 – At
Technical Analysis & Mitigation Measures
1. Technical Attack Analysis:
– Attack Techniques :
– T1053.002 – Scheduled Task/Job: At : Attackers may exploit the vulnerability in picotls by crafting a malicious TLS handshake message that triggers the double free condition. By doing so, they can manipulate memory management, potentially leading to a use-after-free scenario. This could allow them to execute arbitrary code within the context of the affected application, leading to unauthorized access or control over the system.
– Possible Outcomes of Exploitation :
– Arbitrary code execution, allowing attackers to run malicious code on the victim’s machine.
– Potential unauthorized access to sensitive data handled by the application using picotls.
– Denial of service due to application crashes caused by the triggered malloc error.
– Escalation of privileges if the exploited application runs with elevated permissions.
2. Mitigation Measures:
– Upgrade picotls to the version addressing CVE-2024-45402.
– Implement memory management best practices to prevent double free vulnerabilities.
– Conduct regular security audits and code reviews focusing on memory handling.
– Use memory-safe programming languages or tools that provide additional safety checks.
– Employ intrusion detection systems to monitor for abnormal behaviors related to TLS handshakes.
– Limit the attack surface by minimizing the exposure of services relying on picotls.
– Train developers on secure coding practices, specifically related to memory management.
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