Out-of-bounds Read in Yubico Yubihsm-Shell
CVE-2020-24387
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.
Vulnerability class: Buffer Overflow
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-2020-24387?
- CVE-2020-24387 is a high-severity vulnerability in Yubico Yubihsm-Shell, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2020-10-19.
- How severe is CVE-2020-24387?
- High severity. CVSS v3 base score is 7.5 out of 10.