PT-2020-15725 · Yubico · Yubihsm-Shell

Christian Reitter · Published 2020-10-19 · Updated 2021-07-21 · CVE-2020-24388

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions yubihsm-shell versions prior to 2.0.3

Description An issue was discovered in the send secure msg() function. The function does not validate the embedded length field of a message received from the device, which 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.

Recommendations For versions prior to 2.0.3, update to version 2.0.3 or later to resolve the issue. As a temporary workaround, consider disabling the send secure msg() function until a patch is available.

Exploit

Fix

Memory Corruption

RCE

Weakness Enumeration

CWE-787

CWE-20

Related Identifiers

CVE-2020-24388

Affected Products

Yubihsm-Shell

References · 7

• 🔥 https://blog.inhq.net/posts/yubico-libyubihsm-vuln · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO · Vendor Advisory
• https://yubico.com/support/security-advisories/ysa-2020-06 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-24388 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-24388 · Security Note
• https://developers.yubico.com/yubihsm-shell · Vendor Advisory
• https://github.com/Yubico/yubihsm-shell · Note