A team of security experts and academics uncovered a memory-dumping vulnerability in the Great Firewall of China, dubbed Wallbleed. Although the vulnerability allows for only a limited leak of 125 bytes of information, it represents an important breakthrough in understanding the firewall's operations. Wallbleed exists within the DNS injection subsystem, which forges DNS responses to block access to prohibited sites. This finding highlights the complexity of the Great Firewall, which has evolved significantly since its inception in the late 1990s, serving to monitor and control internet access in China.
The research team revealed a data-leaking flaw named Wallbleed, which exposes limited data from the Great Firewall of China, marking a significant discovery.
Wallbleed operates within the DNS injection subsystem of the GFW, detailing how the firewall generates forged DNS responses to block access to prohibited websites.
Although Wallbleed can only reveal up to 125 bytes of data, discovering a bug within China's censorship apparatus is considered a noteworthy achievement.
The GFW has been evolving since the late nineties, increasingly sophisticated in censoring foreign websites and monitoring the online activities of Chinese citizens.
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