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_key` will free on `e` and return as it is failed but variable ‘e’ is remained as already freed memory address . `shdr_verify_signature` will free again that memory (which is `e`) even it is freed when it failed allocate RSA key. A patch is available in version 3.22. No known workarounds are available.
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Wed, 25 Sep 2024 19:30:00 +0000
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2024-09-25T18:49:09.428Z
Reserved: 2023-08-28T16:56:43.366Z
Link: CVE-2023-41325
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Updated: 2024-08-02T19:01:34.320Z
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Status : Modified
Published: 2023-09-15T20:15:10.800
Modified: 2024-11-21T08:21:04.620
Link: CVE-2023-41325
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