Integer Overflow Vulnerability in Yubico YubiHSM 2 SDK
CVE-2021-32489

4.4MEDIUM

Key Information:

Vendor

Yubico

Status
Yubihsm-shell
Vendor
CVE Published:
10 May 2021

What is CVE-2021-32489?

An integer overflow vulnerability has been discovered in the '_send_secure_msg()' function of Yubico's yubihsm-shell, which is part of the YubiHSM 2 SDK. This issue arises when the function fails to properly validate the embedded length field of an authenticated message coming from the device. Specifically, an accepted response message with a length of 8 can lead to an integer overflow, causing the CRYPTO_cbc128_decrypt function in OpenSSL to operate on an undersized buffer, which in turn results in a segmentation fault. This flaw poses potential risks for applications utilizing Yubico’s solutions for secure message processing.

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References

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

CVSS V3.1

Score:
4.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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