TLS-SSL - CVE-2016-6302 Subscribe to Security Advisories

Sunday, July 29, 2018
Sunday, July 29, 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-2016-6302 CVSS 3.0 7.5 High Malformed SHA512 ticket DoS

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

4.1.4 – 4.1.4-P1

4.1.4-P2

4.1.2 – 4.1.2-P4

4.1.2-P5

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-P2

2.6.1-GR1 – 2.6.1-GR1-P16

2.7.2-P13, 4.1.0-P12, 4.1.1-P9, 4.1.4-P2

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-2016-6302

If a server uses SHA512 for TLS session ticket HMAC it is vulnerable to a DoS attack where a malformed ticket will result in an OOB read which will ultimately crash.

The use of SHA512 in TLS session tickets is comparatively rare as it requires a custom server callback and ticket lookup mechanism.

Acknowledgements 

None.

Modification History 
RevisionDateDescription
1.0
July 29, 2018

Initial Publication

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