cve/2019/CVE-2019-9517.md

CVE-2019-9517

Description

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

POC

Reference

• https://kb.cert.org/vuls/id/605641/
• https://kb.cert.org/vuls/id/605641/
• https://www.oracle.com/security-alerts/cpuapr2020.html
• https://www.oracle.com/security-alerts/cpuapr2020.html
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

Github

• https://github.com/florentvinai/CompteRendu-CTF-Mordor