$ sql = "UPDATE users SET PASSWORD='$ pass' where username='$ username' and password='$ curr_pass' ";我们的用户名被admin'#传入进去,在数据库里#号为注释符 然后这句话就变成了
$ sql = "UPDATE users SET PASSWORD=’$ pass’ where username=’admin ‘ #’ and password=’$ curr_pass’ ";然后就是=8
$ sql = "UPDATE users SET PASSWORD=’$ pass’ where username=’admin‘宽字节注入
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