The vulnerability here must be XML External Entity processing. Now we get a clue that the data we send is should be XML. The trick was to figure out that you had to send something in the request body instead of a GET parameter.Ī new error message: `That XML string is not well-formed` `Hi!` and we get an error page saying "Empty string supplied as input." The button on the main page does not work at all. Language solves this problem by being readable to neither. Others can be read by machines but not by humans. Some languages can be read by human, but not by machines, while This **GET** request seems to contain an interesting parameter that looks like a flag.ĭecoding this from URL encoding yields the flag Searched for `http` traffic and found a single stream with some very interesting information in it The company recommends investing in a large-scale network line to counteract large TCP attacks, such as in the case of XOR.DDoS.# Defcamp 2020 writeups :triangular_flag_on_post: If the request is made for attack, another SYN request from another IP will be received,” a statement from CDNetworks says. If the session request is normal, the same IP will send the SYN request again. “This technique works by saving the first SYN packet information in the memory and dropping the packet. Alternatively, First SYN DROP can be another effective method of blocking attacks. The cookie compares sequencing the SYN and if they are not identical, the packet is discarded. The company recommends using a SYN cookie that is effective against spoofing attacks. It suggests that SSH Services (22/TCP) are being used in most attacks, cloud systems without proper security management are most likely to have been hacked.ĬDNetworks says the SYN and data flooding can theoretically be blocked if SYN packets with data are detected. The report found that 77.1% of the attacks have occurred in China and the United States, mainly in Linux servers that use cloud services and in large-scale cloud service providers, the report found. In addition, the attack uses TCP, which the small network line can’t block. The XOR.DDoS creates huge volumes of data and meaningless strings in the SYN flood attack, which CDNetworks says is a serious threat as most companies do not have the network processing capacity to deal with the data. While the original attack targeted Linux, the newer version can also attack Windows PCs, turning them into ‘zombie’ PCs through the Command & Control (C&C) server. The malware in question,, was detected in 2014 and has been the subject of many research analyses. Last year the world was affected by a mass-scale XOR.DDoS attack against Linux PCs at a rate of over 150 Gbps.
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