CVE-2020-36476
First published: Mon Aug 23 2021(Updated: )
An issue was discovered in Mbed TLS before 2.24.0 (and before 2.16.8 LTS and before 2.7.17 LTS). There is missing zeroization of plaintext buffers in mbedtls_ssl_read to erase unused application data from memory.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ARM mbed TLS | <2.7.17 | |
| ARM mbed TLS | >=2.8.0<2.16.8 | |
| ARM mbed TLS | >=2.17.0<2.24.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-36476?
CVE-2020-36476 is a vulnerability in Mbed TLS before versions 2.24.0, 2.16.8 LTS, and 2.7.17 LTS that allows attackers to access sensitive data in memory.
How can the CVE-2020-36476 vulnerability be exploited?
The CVE-2020-36476 vulnerability can be exploited by an attacker to read sensitive information from memory by taking advantage of missing zeroization of plaintext buffers in the mbedtls_ssl_read function.
What is the severity of CVE-2020-36476?
CVE-2020-36476 has a severity score of 7.5 (high).
Which software versions are affected by CVE-2020-36476?
The following versions of Mbed TLS and Debian Linux are affected: Mbed TLS versions up to (excluding) 2.7.17, 2.8.0 up to (excluding) 2.16.8, and 2.17.0 up to (excluding) 2.24.0. Debian Linux versions 9.0 and 10.0.
How can I fix the CVE-2020-36476 vulnerability?
To fix the CVE-2020-36476 vulnerability, update Mbed TLS to version 2.24.0, 2.16.8 LTS, or 2.7.17 LTS, depending on the affected version. Additionally, update Debian Linux to the latest available version.
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