Bug 1890205 (CVE-2020-24388) - CVE-2020-24388 yubihsm-shell: _send_secure_msg() does not validate the embedded length field of a message which could result in DoS
Summary: CVE-2020-24388 yubihsm-shell: _send_secure_msg() does not validate the embed...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-24388
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1890206
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-10-21 16:55 UTC by Michael Kaplan
Modified: 2020-10-21 20:21 UTC (History)
1 user (show)

Fixed In Version:
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Last Closed: 2020-10-21 20:21:18 UTC


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Description Michael Kaplan 2020-10-21 16:55:24 UTC
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.

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/

Comment 1 Michael Kaplan 2020-10-21 16:55:41 UTC
Created yubihsm-shell tracking bugs for this issue:

Affects: fedora-all [bug 1890206]

Comment 2 Product Security DevOps Team 2020-10-21 20:21:18 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


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