Vulnerability · Published Oct 19, 2020 · Assigned by mitre

CVE-2020-24387

High 7.5

In plain English

A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.8% (higher than 78% of all known vulnerabilities).

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.8%top 22.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An issue was discovered in the yh_create_session() function of yubihsm-shell through 2.0.2. The function does not explicitly check the returned session id from the device. An invalid session id would lead to out-of-bounds read and write operations in the session array. This could be used by an attacker to cause a denial of service attack.

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/Yubico/yubihsm-shell x_refsource_MISC
https://developers.yubico.com/yubihsm-shell/ x_refsource_MISC
https://www.yubico.com/support/security-advisories/ysa-2020-06/ x_refsource_MISC
https://blog.inhq.net/posts/yubico-libyubihsm-vuln/ x_refsource_MISC
FEDORA-2020-8afd443d46 vendor-advisory, x_refsource_FEDORA