Bug 1890203 (CVE-2020-24387)

Summary:	CVE-2020-24387 yubihsm-shell: yh_create_session() does not explicitly check the returned session id could result in DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jjelen
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2021-10-28 05:27:23 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description Michael Kaplan 2020-10-21 16:52:05 UTC

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.

References:

https://blog.inhq.net/posts/yubico-libyubihsm-vuln/
https://developers.yubico.com/yubihsm-shell/
https://github.com/Yubico/yubihsm-shell
https://www.yubico.com/support/security-advisories/ysa-2020-06/