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CVE-2019-11479

Description

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

POC

Reference

- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

- https://kc.mcafee.com/corporate/index?page=content&id=SB10287

- https://www.oracle.com/security-alerts/cpujan2020.html

- https://www.oracle.com/security-alerts/cpuoct2020.html

Github

- https://github.com/DevOps-spb-org/Linux-docs

- https://github.com/Ivan-778/docLinux

- https://github.com/Skrypnykov/Linux-docs

- https://github.com/hightemp/docLinux

- https://github.com/ibrahmsql/discoursemap

- https://github.com/kaosagnt/ansible-everyday

- https://github.com/misanthropos/FFFFM