Buffer overflow in Yubico Yubihsm-Shell
CVE-2020-24388
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.018 (77.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Yubico Yubihsm-Shell
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
References
- github.com/Yubico/yubihsm-shell (Third Party Advisory)
- developers.yubico.com/yubihsm-shell/ (Vendor Advisory)
- www.yubico.com/support/security-advisories/ysa-2020-06/ (Vendor Advisory)
- blog.inhq.net/posts/yubico-libyubihsm-vuln/ (Exploit, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-24388?
- CVE-2020-24388 is a high-severity vulnerability in Yubico Yubihsm-Shell, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-10-19.
- How severe is CVE-2020-24388?
- High severity. CVSS v3 base score is 7.5 out of 10.