HTTP Header Injection Meets Response Queue Poisoning: A Critical Attack Vector
By
HackMoN Ai
Summary
This article details how HTTP header injection, traditionally considered a moderate-severity vulnerability, can be escalated into a critical attack vector when combined with response queue poisoning. It references James Kettle's (PortSwigger) 2022 demonstration that turned a simple header injection into a $12,500 bug bounty. The piece explains the technical mechanics of response queue poisoning, how it enables large-scale data exposure, and why security professionals need to reassess the severity of header injection flaws.
Source
bskyHTTP Header Injection Meets Response Queue Poisoning: A Critical Attack Vectorundercodetesting.comKey quotes
· 3 pulledHTTP header injection has long been underestimated by security professionals, often dismissed as a moderate-severity flaw on par with cross-site scripting (XSS) or open redirection.
However, when combined with response queue poisoning, this seemingly mundane vulnerability transforms into a critical attack vector capable of exposing sensitive user data at scale.
In September 2022, James Kettle (Director of Research at PortSwigger) demonstrated this exact transformation, turning a simple header injection into a $12,500 bug bounty by leveraging a tech
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