CVE-2018-5407

Impact:
Moderate
Public Date:
2018-10-30
CWE:
CWE-200
Bugzilla:
1645695: CVE-2018-5407 openssl: Side-channel vulnerability on SMT/Hyper-Threading architectures (PortSmash)
A microprocessor side-channel vulnerability was found on SMT (e.g, Hyper-Threading) architectures. An attacker running a malicious process on the same core of the processor as the victim process can extract certain secret information.

Find out more about CVE-2018-5407 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This is a timing side-channel flaw on processors which implement SMT/Hyper-Threading architectures. It can result in leakage of secret data in applications such as OpenSSL that has secret dependent control flow at any granularity level. In order to exploit this flaw, the attacker needs to run a malicious process on the same core of the processor as the victim process.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 4.8
CVSS3 Base Metrics CVSS:3.0/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack Vector Physical
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity Impact None
Availability Impact None

Affected Packages State

Platform Package State
Red Hat Virtualization 4 openssl Affected
Red Hat Virtualization 4 OVMF Affected
Red Hat JBoss Web Server 5 openssl Affected
Red Hat JBoss Web Server 3 openssl Will not fix
Red Hat JBoss EWS 2 openssl Will not fix
Red Hat JBoss EAP 6 openssl Will not fix
Red Hat JBoss EAP 5 openssl Will not fix
Red Hat JBoss Core Services 1 openssl Affected
Red Hat Enterprise Linux 7 OVMF Affected
Red Hat Enterprise Linux 7 openssl098e Will not fix
Red Hat Enterprise Linux 7 openssl Affected
Red Hat Enterprise Linux 6 openssl Will not fix
Red Hat Enterprise Linux 6 openssl098e Will not fix
Red Hat Enterprise Linux 5 openssl097a Will not fix
Red Hat Enterprise Linux 5 openssl Will not fix

Acknowledgements

Red Hat would like to thank Billy Bob Brumley, Cesar Pereida Garcia, Sohaib ul Hassan, Nicola Tuveri (Tampere University of Technology; Finland), and Alejandro Cabrera Aldaya (Universidad Tecnologica de la Habana CUJAE; Cuba) for reporting this issue.

Mitigation

At this time Red Hat Engineering is working on patches to address this issue. Until fixes are available, users are advised to review the guidance supplied in the L1 Terminal Fault vulnerability article: https://access.redhat.com/security/vulnerabilities/L1TF and decide what their exposure across shared CPU threads are and act accordingly.

External References

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