Race Condition leads to undeletable group member
业务逻辑 / TOCTOU 竞态条件 / #604534
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摘自原文（1950 字符中的一小部分）
**Summary:** There exists a Race Condition in which the user can add themselves twice to a group which will make them unremovable from group. They themselves cannot remove themselves from the group as well as the group leader cannot remove that user from the group. Ofcourse this is a low severity …
原文中的代码
POST /group/post_join HTTP/1.1 Host: ctf.hacker101.com User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: …
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