CVE-2023-41325: OP-TEE double free in shdr_verify_signature
First published: Fri Sep 15 2023(Updated: )
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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linaro OP-TEE | >=3.20.0<3.22.0 | |
| Linaro OP-TEE | =3.22.0-rc1 |
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Reference Links
Frequently Asked Questions
What is CVE-2023-41325?
CVE-2023-41325 is a vulnerability in OP-TEE, a Trusted Execution Environment (TEE) designed as a companion to a non-secure Linux kernel running on Arm Cortex-A cores using TrustZone technology.
What is the severity of CVE-2023-41325?
The severity of CVE-2023-41325 is high, with a CVSS score of 6.7.
Which software versions are affected by CVE-2023-41325?
Versions 3.20.0 to 3.22.0 (exclusive) of Linaro Op-tee are affected by CVE-2023-41325.
How does CVE-2023-41325 impact OP-TEE?
CVE-2023-41325 can cause a double free in the `shdr_verify_signature` function of OP-TEE, which is used to verify signatures.
How can I fix CVE-2023-41325?
To fix CVE-2023-41325, update OP-TEE to version 3.22.0 or later.
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