CVEs-PoC/2021/CVE-2021-27217.md

### [CVE-2021-27217](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27217)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brightgreen)

### Description

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

### POC

#### Reference
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2

#### Github
No PoCs found on GitHub currently.