CVE-2023-41325 Information

Description

OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.20 and prior to version 3.22 shdr_verify_signature can make a double free. shdr_verify_signature used to verify a TA binary before it is loaded. To verify a signature of it allocate a memory for RSA key. RSA key allocate function (sw_crypto_acipher_alloc_rsa_public_key) will try to allocate a memory (which is optee’s heap memory). RSA key is consist of exponent and modulus (represent as variable e n) and it allocation is not atomic way so it may succeed in e but fail in n. In this case sw_crypto_acipher_alloc_rsa_public_keywill free oneand return as it is failed but variable ‘e’ is remained as already freed memory address .shdr_verify_signaturewill free again that memory (which ise`) even it is freed when it failed allocate RSA key. A patch is available in version 3.22. No known workarounds are available.

Reference

https://github.com/OP-TEE/optee_os/commit/e2ec831cb07ed0099535c7c140cb6338aa62816a https://github.com/OP-TEE/optee_os/security/advisories/GHSA-jrw7-63cq-7vhm