Bug 1958798 (CVE-2021-28484) - CVE-2021-28484 yubihsm-connector: missing validation of the length of a request may lead to an infinite loop
Summary: CVE-2021-28484 yubihsm-connector: missing validation of the length of a reque...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-28484
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: 1958799
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-05-10 07:53 UTC by Marian Rehak
Modified: 2021-05-11 20:34 UTC (History)
2 users (show)

Fixed In Version: yubihsm-connector 3.0.1
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Last Closed: 2021-05-11 20:34:01 UTC
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Description Marian Rehak 2021-05-10 07:53:04 UTC 
An issue was discovered in the /api/connector endpoint handler in Yubico yubihsm-connector before 3.0.1 (in YubiHSM SDK before 2021.04). The handler did not validate the length of the request, which can lead to a state where yubihsm-connector becomes stuck in a loop waiting for the YubiHSM to send it data, preventing any further operations until the yubihsm-connector is restarted. An attacker can send 0, 1, or 2 bytes to trigger this.

Reference:

https://www.yubico.com/support/security-advisories/ysa-2021-02/
Comment 1 Marian Rehak 2021-05-10 07:53:26 UTC 
Created yubihsm-connector tracking bugs for this issue:

Affects: fedora-all [bug 1958799]
Comment 2 Product Security DevOps Team 2021-05-11 20:34:01 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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