TLS-SSL - CVE-2016-6306 Subscribe to Security Advisories

Monday, July 30, 2018
Monday, July 30, 2018
Summary 

In September 2016, openssl.org released a security advisory detailing several security issues. The following vulnerabilities that may affect the TLS/SSL data plane of ACOS devices reported in that advisory are addressed in this document.

Item # Vulnerability ID Score Source Score Summary
1 CVE-2016-6306 CVSS 3.0 5.9 Med Certificate message OOB reads

Affected Releases

The table below indicates releases of ACOS exposed to these vulnerabilities and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.

Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases AffectedReleases Resolved or Unaffected

4.1.2 – 4.1.2-P3

4.1.2-P4

4.1.1 – 4.1.1-P8

4.1.1-P9

4.1.0 – 4.1.0-P11

4.1.0-P12

2.7.2 – 2.7.2-P12

2.7.2-P13

2.7.1-GR1 – 2.7.1-GR1-Px

2.7.2-P13, 4.1.0-P12, 4.1.1-P9, 4.1.4

2.6.1-GR1 – 2.6.1-GR1-P16

2.7.2-P13, 4.1.0-P12, 4.1.1-P9, 4.1.4

Workarounds and Mitigations 

None.

Software Updates 

Software updates that address these vulnerabilities are or will be published at the following URL:
https://www.a10networks.com/support/axseries/software-downloads

Vulnerability Details

The following table shares brief descriptions of the vulnerabilities addressed in this document.

Vulnerability IDVulnerability Description
CVE-2016-6306

In OpenSSL 1.0.2 and earlier some missing message length checks can result in OOB reads of up to 2 bytes beyond an allocated buffer. There is a theoretical DoS risk but this has not been observed in practice on common platforms.

The messages affected are client certificate, client certificate request and server certificate. As a result the attack can only be performed against a client or a server which enables client authentication.

Acknowledgements 

None.

Modification History 
RevisionDateDescription
1.0
July 30, 2018

Initial Publication

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