Vulnerabilities > CVE-2021-27217 - Out-of-bounds Read vulnerability in Yubico Yubihsm-Shell
Attack vector
NETWORK Attack complexity
HIGH Privileges required
HIGH Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 4 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Overread Buffers An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.
References
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln2
- https://github.com/Yubico/yubihsm-shell/releases
- https://github.com/Yubico/yubihsm-shell/releases
- https://www.yubico.com/support/security-advisories/ysa-2021-01/
- https://www.yubico.com/support/security-advisories/ysa-2021-01/