Vulnerability · Published Mar 4, 2021 · Assigned by mitre

CVE-2021-27217

Medium 4.4

In plain English

A medium-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 1.6% (higher than 76% of all known vulnerabilities).

Severity (CVSS NVD)4.4Medium

Exploit odds (30 days)1.6%top 24.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

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

References

https://github.com/Yubico/yubihsm-shell/releases x_refsource_MISC
https://www.yubico.com/support/security-advisories/ysa-2021-01/ x_refsource_CONFIRM
https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 x_refsource_MISC