VulnerabilityModified
CVE-2020-24387
An invalid session id would lead to out-of-bounds read and write operations in the session array.
HIGH 7.5EPSS 1.75%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.75% probability · 77th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-787
- Affected
- yubico/yubihsm-shell · fedoraproject/fedora
- Source
- cve@mitre.org
References
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln/Exploit, Third Party Advisory
- https://developers.yubico.com/yubihsm-shell/Vendor Advisory
- https://github.com/Yubico/yubihsm-shellThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
- https://www.yubico.com/support/security-advisories/ysa-2020-06/Vendor Advisory
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln/Exploit, Third Party Advisory
- https://developers.yubico.com/yubihsm-shell/Vendor Advisory
- https://github.com/Yubico/yubihsm-shellThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
- https://www.yubico.com/support/security-advisories/ysa-2020-06/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.