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18 lines
1.6 KiB
Markdown
18 lines
1.6 KiB
Markdown
### [CVE-2023-41325](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-41325)
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### Description
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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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### POC
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#### Reference
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- https://github.com/OP-TEE/optee_os/security/advisories/GHSA-jrw7-63cq-7vhm
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#### Github
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No PoCs found on GitHub currently.
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