CVE-2020-24388

Public Exploit

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.79% Top 30%
Vendor Advisory fedoraproject.org Vendor Advisory yubico.com Vendor Advisory yubico.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/Yubico/yubihsm-shell third party advisory
https://developers.yubico.com/yubihsm-shell/ vendor advisory
https://www.yubico.com/support/security-advisories/ysa-2020-06/ vendor advisory
https://blog.inhq.net/posts/yubico-libyubihsm-vuln/ third party advisory exploit
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-24388?
CVE-2020-24388 has been scored as a high severity vulnerability.
How to fix CVE-2020-24388?
To fix CVE-2020-24388, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-24388 being actively exploited in the wild?
It is possible that CVE-2020-24388 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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