Bug 2041824 (CVE-2020-36478)

Summary: CVE-2020-36478 mbedtls: NULL algorithm parameters entry looks identical to an array of REAL
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
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Priority: high    
Version: unspecifiedCC: mstevens, redhat-bugzilla
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2022-01-18 11:31:14 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2041825, 2041826    
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Description Dhananjay Arunesh 2022-01-18 10:46:47 UTC
An issue was discovered in Mbed TLS before 2.25.0. A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.

References:
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
https://github.com/ARMmbed/mbedtls/issues/3629
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18

Comment 1 Dhananjay Arunesh 2022-01-18 10:47:14 UTC
Created mbedtls tracking bugs for this issue:

Affects: epel-all [bug 2041826]
Affects: fedora-all [bug 2041825]

Comment 2 Product Security DevOps Team 2022-01-18 11:31:13 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.