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Security Advisory

SYSTEM - CVE-2017-18017
Published: Sunday, August 19th, 2018
Last Update: Friday, October 11th, 2019
Summary

In January 2018, a vulnerability was published affecting the operating system in ACOS 3.x and 4.x. This vulnerability is addressed in this document.

Item # Vulnerability ID Score Source Score Summary
1 CVE-2017-18017 CVSS 3.0 9.8 Critical kernel: netfilter: User-after-free in tcpmss_mangle_packet() in xt_TCPMSS.c
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
4.1.2 – 4.1.2-P4 4.1.2-P5
4.1.1 – 4.1.1-P8 4.1.1-P9
4.1.100 – 4.1.100-P5 4.1.100-P5-SP1
4.1.0 – 4.1.0-P11 4.1.0-P12
3.2.2 – 3.2.2-P4 3.2.2-P5
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 ID Vulnerability Description
CVE-2017-18017

The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xt_TCPMSS in an iptables action.

Related Links

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

Ref # General Link
[1] NIST NVD, CVE-2017-18017
Acknowledgements

None.

Modification History
Revision Date Description
1.0 Sunday, August 19th, 2018

Initial Publication

2.0 Friday, October 11th, 2019

Added 4.1.100 release family.


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