Bug 1875047 (CVE-2020-16150)

Summary: CVE-2020-16150 mbedtls: local side channel attack on classical CBC decryption in (D)TLS
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
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Priority: low    
Version: unspecifiedCC: mstevens, redhat-bugzilla
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2020-09-03 01:17:44 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1875048, 1875049    
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Description Guilherme de Almeida Suckevicz 2020-09-02 20:35:28 UTC
A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an attacker to recover secret key information. This affects CBC mode because of a computed time difference based on a padding length.

References:
https://tls.mbed.org/tech-updates/security-advisories
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1

Comment 1 Guilherme de Almeida Suckevicz 2020-09-02 20:35:46 UTC
Created mbedtls tracking bugs for this issue:

Affects: epel-all [bug 1875048]
Affects: fedora-all [bug 1875049]

Comment 2 Product Security DevOps Team 2020-09-03 01:17:44 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.