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HAProxy Found Vulnerable to Critical HTTP Request Smuggling Attack
A critical security vulnerability (CVE-2021-40346) has been disclosed in HAProxy, a widely used open-source load balancer and proxy server, that could be abused by an adversary to possibly smuggle HTTP requests, resulting in unauthorized access to sensitive data and execution of arbitrary commands, effectively opening the door to an array of attacks. HAProxy has released an upgrade remediating the weakness by adding size checks for the name and value lengths.
Tracked as CVE-2021-40346, the Integer Overflow vulnerability has a severity rating of 8.6 on the CVSS scoring system and has been rectified in HAProxy versions 2.0.25, 2.2.17, 2.3.14 and 2.4.4.
HTTP Request Smuggling, as the name implies, is a web application attack that tampers the manner a website processes sequences of HTTP requests received from more than one user. Also called HTTP desynchronization, the technique takes advantage of parsing inconsistencies in how front-end servers and back-end servers process requests from the senders.