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Security Advisory

TLS-SSL - CVE-2016-6302
Published: Sunday, July 29th, 2018
Last Update: Sunday, July 29th, 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 Affected Releases 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

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

Vulnerability ID Vulnerability 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.

Related Links

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

Ref # General Link
[1] NIST NVD, CVE-2016-6302
Acknowledgements

None.

Modification History
Revision Date Description
1.0 Sunday, July 29th, 2018

Initial Publication


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