High severity · published Oct 19, 2020
CVE-2020-24387
An issue was discovered in the yh_create_session() function of yubihsm-shell through 2.0.2
7.5
CVSS
1.8%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
33 · source: NVD
YU
Yubihsm-shell · Yubico
through 2.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-24387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-24387
Exploit
https://blog.inhq.net/posts/yubico-libyubihsm-vuln/
Vendor Advisory
https://developers.yubico.com/yubihsm-shell/
Third Party Advisory
https://github.com/Yubico/yubihsm-shell
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
Vendor Advisory
https://www.yubico.com/support/security-advisories/ysa-2020-06/
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