{"id":1300,"date":"2023-04-07T14:08:34","date_gmt":"2023-04-07T06:08:34","guid":{"rendered":"https:\/\/fushuling.com\/?p=1300"},"modified":"2023-07-31T14:43:19","modified_gmt":"2023-07-31T06:43:19","slug":"2023xctf-final-web%e9%a2%98%e5%a4%8d%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/fushuling.com\/index.php\/2023\/04\/07\/2023xctf-final-web%e9%a2%98%e5%a4%8d%e7%8e%b0\/","title":{"rendered":"2023XCTF FINAL web\u9898\u590d\u73b0"},"content":{"rendered":"\n

\u672c\u6587\u9996\u53d1\u4e8e\u5148\u77e5\u793e\u533a<\/a>\u3002<\/p>\n\n\n\n

\u5f53\u65f6\u662f\u548cSU\u4e00\u8d77\u53bb\u6253\u7684\uff0c\u5b8c\u6574\u7684wp\u53ef\u4ee5\u67e5\u770b2023 XCTFfinals SU Writeup<\/a>\uff0c\u6211\u8fd9\u91cc\u53ea\u590d\u73b0\u4e00\u4e0b\u4e24\u9053web\u9898\u3002<\/p>\n\n\n\n

sign_in<\/h1>\n\n\n\n

\u5f53\u65f6\u6bd4\u8d5b\u7684\u65f6\u5019\u662f\u6709\u4e00\u4e2a\u767b\u5f55\u754c\u9762\uff0c\u6211\u8fd9\u91cc\u590d\u73b0\u7528\u7684\u961f\u91ccyulate\u5e08\u5085\u642d\u7684\u5728\u7ebf\u73af\u5883\uff0c\u6bd4\u8d5b\u7684\u65f6\u5019\u6ca1\u653ehint\u4e4b\u524d\u4e00\u76f4\u662f\u96f6\u89e3\uff0c\u540e\u9762\u653e\u4e86hint\u4e4b\u540e\u624d\u6709\u961f\u9010\u6e10\u505a\u51fa\u6765\u3002hint\u8bf4Username and password store in React Redux state\uff0c\u7136\u540e\u5f00\u59cb\u770b\u8fd9\u4e2areact\u6846\u67b6\uff0cKeenLab Tech Talk\uff08\u4e8c\uff09| \u6d45\u8c08React\u6846\u67b6\u7684XSS\u53ca\u540e\u5229\u7528<\/a>\u91cc\u63d0\u5230\uff1a<\/p>\n\n\n\n

\n

\u5728\u5f15\u5165\u4e86Fiber\u7684React\uff0816.8+\uff09\uff0c\u4f1a\u591a\u51fa reactFiber$xxxx \u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u5bf9\u5e94\u7684\u5c31\u662f\u8fd9\u4e2aDOM\u5728React\u5185\u90e8\u5bf9\u5e94\u7684FiberNode\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528child\u5c5e\u6027\u83b7\u5f97\u5b50\u8282\u70b9\u3002\u8282\u70b9\u5c42\u7ea7\u53ef\u4ee5\u4eceReact Dev Tool\u5185\u67e5\u770b\u3002\u901a\u8fc7\u8bfb\u53d6\u6bcf\u4e2aFiberNode\u7684 memoizedProps \u548c memoizedState \uff0c\u5373\u53ef\u76f4\u63a5\u83b7\u53d6\u9700\u8981\u7684Prop\u548cState\u3002\u5728\u9ad8\u7248\u672c\u4f7f\u7528React Hooks\u7684\u9879\u76ee\u4e2d\uff0cFiberNode\u7684 memorizedState \u662f\u4e00\u4e2a\u94fe\u8868\uff0c\u8be5\u94fe\u8868\u5185\u7684\u8282\u70b9\u6b21\u5e8f\u53ef\u4ee5\u53c2\u8003\u8be5\u7ec4\u4ef6\u6e90\u7801\u5185 useState \u7684\u8c03\u7528\u987a\u5e8f\u3002\u65e7\u7248React\uff0c\u5f15\u5165\u7684\u5c5e\u6027\u662f reactInternalInstance \u3002State\u4e5f\u662f\u4e00\u4e2aObject\u800c\u975e\u94fe\u8868\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u770b\u5230\u6bcf\u4e2astate\u7684\u540d\u5b57\u3002<\/p>\n<\/blockquote>\n\n\n\n

\u7136\u540e\u6211\u4eec\u53ef\u4ee5\u5b89\u88c5React Dev Tool\u63d2\u4ef6\uff0c\u53ef\u4ee5\u76f4\u63a5\u770b\u5230state\u4e2d\u7684\u8d26\u53f7\u5bc6\u7801\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u80fd\u4e0d\u80fd\u4e0d\u7528\u8fd9\u4e2a\u63d2\u4ef6\u76f4\u63a5\u5728\u524d\u7aefjs\u91cc\u641c\u7d22\u5462\uff1f\u5f53\u7136\u662f\u53ef\u4ee5\u7684\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4f46\u6709\u51e0\u4e2a\u95ee\u9898\uff0c\u4e00\u662f\u5f53\u65f6\u7684\u4ee3\u7801\u6df7\u6dc6\u5f88\u591a\uff0c\u4e0d\u597d\u627e\uff0c\u7b2c\u4e8c\u662f\u5f53\u65f6\u7684\u5bc6\u7801\u4e0d\u662f\u660e\u6587\uff0c\u800c\u662fmd5\u52a0\u5bc6\u4e4b\u540e\u7684\uff0c\u7279\u5f81\u4e0d\u660e\u663e\uff0c\u4e0d\u597d\u5206\u8fa8\u662f\u5426\u662f\u5bc6\u7801\uff0c\u4f46\u5c0f\u7ea2\u4e66\u7684\u9006\u5411\u5de5\u7a0b\u5e08tsingshui\u54e5\u54e5\u544a\u8bc9\u6211\u5176\u5b9e\u8fd8\u662f\u53ef\u4ee5\u901a\u8fc7\u4e0b\u65ad\u70b9\u76f4\u63a5\u5806\u6808\u6eaf\u6e90\u627e\u903b\u8f91\u76f4\u63a5\u5feb\u901f\u5b9a\u4f4d\uff08\u4f46\u6211\u4e0d\u4f1a\uff09\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u7136\u540e\u901a\u8fc7\u8d26\u53f7\u548c\u5bc6\u7801\u6211\u4eec\u53ef\u4ee5\u767b\u5f55\u8fdb\u540e\u53f0\uff0c\u7136\u540e\u4f1a\u6709\u63d0\u793a\uff0c\u8ba9\u6211\u4eec\u7528http3.0<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

HTTP3.0\u53c8\u79f0\u4e3aHTTP Over QUIC\uff0c\u5176\u5f03\u7528TCP\u534f\u8bae\uff0c\u6539\u4e3a\u4f7f\u7528\u57fa\u4e8eUDP\u534f\u8bae\u7684QUIC\u534f\u8bae\u6765\u5b9e\u73b0\uff0c\u6240\u4ee5\u6211\u4eec\u73b0\u5728\u4f7f\u7528\u7684\u6d4f\u89c8\u5668\u76f4\u63a5\u8bbf\u95ee\u662f\u6ca1\u6cd5\u8bbf\u95ee\u7684\uff1a<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u4ed6\u4f1a\u663e\u793a404 Not Found\uff0cHTTP3.0\u867d\u7136\u5f88\u6f6e\uff0c\u4f46\u662f\u76ee\u524d\u80fd\u552f\u4e00\u6709\u6548\u8fde\u63a5\u7684\u5de5\u5177\u8fd8\u662f\u53ea\u6709curl\uff0c\u60f3\u8981\u91cd\u65b0\u7f16\u8bd1\u652f\u6301HTTP3.0\u7684\u8bdd\u8fc7\u7a0b\u5341\u5206\u7e41\u7410\uff0c\u65e2\u8981\u4e0bQuiche\u91cd\u65b0\u7f16\u8bd1\uff0c\u53c8\u8981\u4e0bbrew\u5305\u7ba1\u7406\u4e4b\u7c7b\u7684\uff0c\u4e0d\u8fc7\u597d\u5728\u5df2\u7ecf\u6709\u73b0\u6210\u7684docker\u4e86\uff0c\u7528\u522b\u4eba\u7684\u5c31\u884c\u4e86\uff1a<\/p>\n\n\n\n

docker run -it --rm ymuski\/curl-http3 curl -Lv https:\/\/url\/flag.html --http3 -k<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6700\u540e\u62ff\u5230\u6d4b\u8bd5flag<\/p>\n\n\n\n
dbtrick<\/h2>\n\n\n\n
\u6bd4\u8d5b\u65f6\u4e3b\u9875\u6709\u4e00\u4e2a\u8868\u5355\u53ef\u4ee5\u6267\u884csql\u547d\u4ee4\uff0c\u4f46\u6709\u5f88\u591a\u51fd\u6570\u88ab\u8fc7\u6ee4\u4e86\uff1a<\/p>\n\n\n\n
black list\nselect\nset\nGRANTS\ncreate\ninsert\nload\nPREPARE\nrename\nupdate\nHANDLER\nupdatexml<\/code><\/pre>\n\n\n\n
\u7136\u540e\u8fd8\u6709\u4e00\u4e2aadmin.php\u9875\u9762\uff1a<\/p>\n\n\n\n
#admin.php\n<?php\n\/\/flag is in \/flag \n$con = new PDO($dsn,$user,$pass); \n$sql = \"select * from ctf.admin where username=? and password=?\"; \n$sth = $con->prepare($sql); \n$res = $sth->execute([$_POST['username'],$_POST['password']]); \nif($sth->rowCount()!==0){ \n    readfile('\/flag'); \n}<\/code><\/pre>\n\n\n\n
\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u9996\u5148\u7528PDO\u9884\u7f16\u8bd1\u786e\u4fdd\u4e86\u6211\u4eec\u4e0d\u80fd\u6ce8\u5165\uff0c\u7136\u540e\u53ea\u8981\u80fd\u4ecectf.admin\u91cc\u67e5\u51fausername\u548cpassword\u7684\u6570\u636e\u5c31\u53ef\u4ee5\u62ff\u5230flag\uff0c\u7528show\u53ef\u4ee5\u67e5\u8868\uff0c\u53ef\u4ee5\u53d1\u73b0\u9898\u76ee\u73af\u5883\u91cc\u7684\u6570\u636e\u5e93\u91ccctf.admin\u8fd9\u4e2a\u8868\u5176\u5b9e\u6839\u672c\u4e0d\u5b58\u5728\uff0c\u56e0\u6b64\u9700\u8981\u6211\u4eec\u81ea\u5df1\u7ed5\u8fc7\u8fc7\u6ee4\u521b\u5efa\u8868\u3002<\/p>\n\n\n\n
\u5229\u7528EXECUTE <\/h3>\n\n\n\n
\u8fd9\u4e2a\u65b9\u6cd5\u662f\u5f53\u65f6\u6bd4\u8d5b\u65f6\u6e05\u534e\u5927\u5b66\u7684\u975e\u9884\u671f\u89e3\uff0c\u53ef\u4ee5\u770b\u5230EXECUTE IMMEDIATE Statement<\/a>\uff0c\u91cc\u9762\u63d0\u5230\u5728MariaDB 10.0.3 \u4e4b\u540e\uff0c\u65b0\u589e\u4e86\u4e00\u79cd\u52a8\u6001SQL\u8bed\u53e5\uff0c\u5b83\u53ef\u4ee5\u5728\u5355\u4e2a\u64cd\u4f5c\u4e2d\u6784\u5efa\u5e76\u8fd0\u884c\u52a8\u6001SQL\u8bed\u53e5\uff0c\u5b83\u7684\u8bed\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
EXECUTE IMMEDIATE stmt_string [INTO var_name [, ...]]\n<\/code><\/pre>\n\n\n\n
\u5176\u4e2dstmt_string\u200b\u662f\u8981\u6267\u884c\u7684 SQL \u67e5\u8be2\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u5305\u542b\u5360\u4f4d\u7b26\u3002var_name\u200b \u662f\u53ef\u9009\u7684\u53c2\u6570\u5217\u8868\uff0c\u7528\u4e8e\u4ece\u67e5\u8be2\u7ed3\u679c\u4e2d\u63a5\u6536\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u672c\u5730\u8d77\u4e00\u4e2adocker\u6d4b\u8bd5\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
docker run -p 127.0.0.1:3306:7706  --name mdb -e MARIADB_ROOT_PASSWORD=Password123! -d mariadb:latest\ndocker exec -it mdb mariadb --user root -pPassword123!<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6210\u529f\u542f\u52a8\u3002<\/p>\n\n\n\n
\u6b63\u5e38\u60c5\u51b5\u4e0b\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528select * from time_zone;\u67e5\u770btime_zone\u4e0b\u7684\u6570\u636e\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u4e5f\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528EXECUTE IMMEDIATE\u505a\u76f8\u540c\u7684\u4e8b\uff0c\u53ea\u8981\u8f93\u5165EXECUTE IMMEDIATE ‘select * from time_zone’;\u5373\u53ef\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u867d\u7136\u521b\u5efa\u8868\u7684\u90a3\u4e9b\u51fd\u6570\u90fd\u88abban\u4e86\uff0c\u4f46\u5f53\u65f6\u5e76\u6ca1\u6709ban\u5404\u79cd\u5b57\u7b26\u4e32\u7f16\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528UNHEX\uff0cBASE64\u4e4b\u7c7b\u7684\u8fdb\u884c\u7ed5\u8fc7\uff0c\u5982\uff1a<\/p>\n\n\n\n
EXECUTE IMMEDIATE FROM_BASE64('Q1JFQVRFIFRBQkxFIGFkbWluICh1c2VybmFtZSBWQVJDSEFSKDIwKSwgcGFzc3dvcmQgVkFSQ0hBUigyMCkp');<\/code><\/pre>\n\n\n\n
\u5373EXECUTE IMMEDIATE ‘CREATE TABLE admin (username VARCHAR(20), password VARCHAR(20))’;<\/p>\n\n\n\n
EXECUTE IMMEDIATE FROM_BASE64('SU5TRVJUIElOVE8gYWRtaW4gKHVzZXJuYW1lLCBwYXNzd29yZCkgVkFMVUVTICgnYWRtaW4nLCAnMTIzNDU2Jyk=');<\/code><\/pre>\n\n\n\n
\u5373EXECUTE IMMEDIATE ‘INSERT INTO admin (username, password) VALUES (‘admin’, ‘123456’)’;<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6700\u540e\u6210\u529f\u5efa\u8868\u5e76\u63d2\u5165\u6570\u636e\uff0c\u5728\u6bd4\u8d5b\u65f6\u5c31\u53ef\u4ee5\u62ff\u5230flag\u4e86\u3002<\/p>\n\n\n\n
mariadb\u4e3b\u4ece\u590d\u5236<\/h3>\n\n\n\n
\u8fd9\u79cd\u65b9\u6cd5\u624d\u662f\u51fa\u9898\u4eba\u7684\u9884\u671f\u89e3\uff0c\u53ef\u4ee5\u53c2\u8003\u53f2\u4e0a\u6700\u8be6\u7ec6Docker\u90e8\u7f72Mysql\u4e3b\u4ece\u590d\u5236\uff0c\u5e26\u6bcf\u4e00\u6b65\u9aa4\u56fe\uff01\uff01\uff01<\/a><\/p>\n\n\n\n
\u5728\/etc\/mysql\/my.cnf [mysqld]\u200b\u5757\u4e0b\u6dfb\u52a0\uff1a<\/p>\n\n\n\n
[mysqld]\nserver_id = 2 \nsecure_file_priv= \nlog-bin = mysql-bin<\/code><\/pre>\n\n\n\n
\u4e3b\u670d\u52a1\u5668\u6267\u884c\uff1a<\/p>\n\n\n\n
CREATE USER 'admin'@'%' IDENTIFIED BY '123456';\nGRANT REPLICATION SLAVE ON *.* TO 'admin'@'%';<\/code><\/pre>\n\n\n\n
\u4ece\u670d\u52a1\u5668\u6267\u884c\uff1a<\/p>\n\n\n\n
CHANGE MASTER TO \n  MASTER_HOST='172.17.0.2', \n  MASTER_USER='admin', \n  MASTER_PASSWORD='123456', \n  MASTER_LOG_FILE='mysql-bin.000001', \n  MASTER_LOG_POS=0; START SLAVE;<\/code><\/pre>\n\n\n\n
\u4e3b\u4ece\u590d\u5236\u5efa\u7acb\u4e4b\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u4e3b\u670d\u52a1\u5668\u7684\u6570\u636e\u5e93\u590d\u5236\u5230\u4ece\u670d\u52a1\u5668\u91cc\uff0c\u8fd9\u6837\u5c31\u80fd\u6210\u529f\u5efa\u8868\u4e86\u3002<\/p>\n\n\n\n
\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u672c\u6587\u9996\u53d1\u4e8e\u5148\u77e5\u793e\u533a\u3002 \u5f53\u65f6\u662f\u548cSU\u4e00\u8d77\u53bb\u6253\u7684\uff0c\u5b8c\u6574\u7684wp\u53ef\u4ee5\u67e5\u770b2023 XCTFfinals SU Writ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-1300","post","type-post","status-publish","format-standard","hentry","category-wp"],"_links":{"self":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/comments?post=1300"}],"version-history":[{"count":5,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1300\/revisions"}],"predecessor-version":[{"id":1348,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/posts\/1300\/revisions\/1348"}],"wp:attachment":[{"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/media?parent=1300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/categories?post=1300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fushuling.com\/index.php\/wp-json\/wp\/v2\/tags?post=1300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}