h2o picotls TLS Protocol double free

Summaryinfo

A vulnerability, which was classified as critical, has been found in h2o picotls. This vulnerability affects unknown code of the component TLS Protocol Handler. The manipulation leads to double free. This vulnerability is referenced as CVE-2024-45402. Remote exploitation of the attack is possible. No exploit is available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in h2o picotls (affected version unknown) and classified as critical. This issue affects an unknown functionality of the component TLS Protocol Handler. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2024-45402 since 08/28/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

Applying the patch 9b88159ce763d680e4a13b6e8f3171ae923a535d is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

• h2o

Name

• picotls

License

• open-source

Website

• Product: https://github.com/h2o/picotls/

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CPE 2.2info

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