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CVE-2020-24388

Date: October 19, 2020

An issue was discovered in the _send_secure_msg() function of yubihsm-shell through 2.0.2. The function does not validate the embedded length field of a message received from the device. This could lead to an oversized memcpy() call that will crash the running process. This could be used by an attacker to cause a denial of service.

Language: C

Severity Score

Related Resources (8)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
https://developers.yubico.com/yubihsm-shell/
https://www.yubico.com/support/security-advisories/ysa-2020-06/
https://nvd.nist.gov/vuln/detail/CVE-2020-24388
https://blog.inhq.net/posts/yubico-libyubihsm-vuln/
https://github.com/Yubico/yubihsm-shell
https://www.mend.io/vulnerability-database/CVE-2020-24388

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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