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CVE-2019-11477

Description

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). 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 commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

POC

Reference

- http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html

- http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html

- 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/0xT11/CVE-POC

- https://github.com/ARPSyndicate/cvemon

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

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

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

- https://github.com/developer3000S/PoC-in-GitHub

- https://github.com/fengjian/kpatch-sack-panic

- https://github.com/hectorgie/PoC-in-GitHub

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

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

- https://github.com/lucassbeiler/linux_hardening_arsenal

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

- https://github.com/oscomp/proj283-Automated-Security-Testing-of-Protocol-Stacks-in-OS-kernels

- https://github.com/sasqwatch/cve-2019-11477-poc

- https://github.com/sonoransun/tcp_sack_fix