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PHP瀹夊叏閰嶇疆(3)

点击次数:43 次 发布日期:2008-11-22 11:57:54 作者:源代码网
源代码网推荐 5銆佹枃浠朵笂浼

php鐨勬枃浠朵笂浼犳満鍒舵槸鎶婄敤鎴蜂笂浼犵殑鏂囦欢淇濆瓨鍦╬hp.ini鐨剈pload_tmp_dir瀹氫箟鐨勪复鏃剁洰褰曪紙榛樿鏄郴缁熺殑涓存椂鐩綍锛屽锛/tmp锛夐噷鐨勪竴涓被浼紁hpxXuoXG鐨勯殢鏈轰复鏃舵枃浠讹紝绋嬪簭鎵ц缁撴潫锛岃涓存椂鏂囦欢涔熻鍒犻櫎銆侾HP缁欎笂浼犵殑鏂囦欢瀹氫箟浜嗗洓涓彉閲忥細锛堝form鍙橀噺鍚嶆槸file锛岃屼笖register_globals鎵撳紑锛

$file #灏辨槸淇濆瓨鍒版湇鍔″櫒绔殑涓存椂鏂囦欢锛堝/tmp/phpxXuoXG 锛
$file_size #涓婁紶鏂囦欢鐨勫ぇ灏
$file_name #涓婁紶鏂囦欢鐨勫師濮嬪悕绉
$file_type #涓婁紶鏂囦欢鐨勭被鍨



鎺ㄨ崘浣跨敤锛

$HTTP_POST_FILES["file"]["tmp_name"]
$HTTP_POST_FILES["file"]["size"]
$HTTP_POST_FILES["file"]["name"]
$HTTP_POST_FILES["file"]["type"]



杩欐槸涓涓渶绠鍗曠殑鏂囦欢涓婁紶浠g爜锛

//test_5.php
if(isset($upload) && $file != "none") {
copy($file, "/usr/local/apache/htdocs/upload/".$file_name);
echo "鏂囦欢".$file_name."涓婁紶鎴愬姛锛佺偣鍑荤户缁笂浼";
exit;
}
?>



content="text/html; charset=gb2312">



涓婁紶鏂囦欢:








杩欐牱鐨勪笂浼犱唬鐮佸瓨鍦ㄨ鍙栦换鎰忔枃浠跺拰鎵ц鍛戒护鐨勯噸澶ч棶棰樸

涓嬮潰鐨勮姹傚彲浠ユ妸/etc/passwd鏂囨。鎷疯礉鍒皐eb鐩綍/usr/local/apache/htdocs/test锛堟敞鎰忥細杩欎釜鐩綍蹇呴』nobody鍙啓锛変笅鐨刟ttack.txt鏂囦欢閲岋細

http://victim/test_5.php?upload=1&file=/etc/passwd&file_name=attack.txt

鐒跺悗鍙互鐢ㄥ涓嬭姹傝鍙栧彛浠ゆ枃浠讹細

http://victim/test/attack.txt

鏀诲嚮鑰呭彲浠ユ妸php鏂囦欢鎷疯礉鎴愬叾瀹冩墿灞曞悕锛屾硠婕忚剼鏈簮浠g爜銆

鏀诲嚮鑰呭彲浠ヨ嚜瀹氫箟form閲宖ile_name鍙橀噺鐨勫硷紝涓婁紶瑕嗙洊浠绘剰鏈夊啓鏉冮檺鐨勬枃浠躲

鏀诲嚮鑰呰繕鍙互涓婁紶PHP鑴氭湰鎵ц涓绘満鐨勫懡浠ゃ

瑙e喅鏂规硶锛

PHP-4.0.3浠ュ悗鎻愪緵浜唅s_uploaded_file鍜宮ove_uploaded_file鍑芥暟锛屽彲浠ユ鏌ユ搷浣滅殑鏂囦欢鏄惁鏄敤鎴蜂笂浼犵殑鏂囦欢锛屼粠鑰岄伩鍏嶆妸绯荤粺鏂囦欢鎷疯礉鍒皐eb鐩綍銆

浣跨敤$HTTP_POST_FILES鏁扮粍鏉ヨ鍙栫敤鎴蜂笂浼犵殑鏂囦欢鍙橀噺銆

涓ユ牸妫鏌ヤ笂浼犲彉閲忋傛瘮濡備笉鍏佽鏄痯hp鑴氭湰鏂囦欢銆

鎶奝HP鑴氭湰鎿嶄綔闄愬埗鍦╳eb鐩綍鍙互閬垮厤绋嬪簭鍛樹娇鐢╟opy鍑芥暟鎶婄郴缁熸枃浠舵嫹璐濆埌web鐩綍銆俶ove_uploaded_file涓嶅彈open_basedir鐨勯檺鍒讹紝鎵浠ヤ笉蹇呬慨鏀筽hp.ini閲寀pload_tmp_dir鐨勫笺

鎶奝HP鑴氭湰鐢╬hpencode杩涜鍔犲瘑锛岄伩鍏嶇敱浜巆opy鎿嶄綔娉勬紡婧愮爜銆

涓ユ牸閰嶇疆鏂囦欢鍜岀洰褰曠殑鏉冮檺锛屽彧鍏佽涓婁紶鐨勭洰褰曡兘澶熻nobody鐢ㄦ埛鍙啓銆

瀵逛簬涓婁紶鐩綍鍘绘帀PHP瑙i噴鍔熻兘锛屽彲浠ラ氳繃淇敼httpd.conf瀹炵幇锛


php_flag engine off
#濡傛灉鏄痯hp3鎹㈡垚php3_engine off




閲嶅惎apache锛寀pload鐩綍鐨刾hp鏂囦欢灏变笉鑳借apache瑙i噴浜嗭紝鍗充娇涓婁紶浜唒hp鏂囦欢涔熸病鏈夐棶棰橈紝鍙兘鐩存帴鏄剧ず婧愮爜銆

6銆佸懡浠ゆ墽琛

涓嬮潰鐨勪唬鐮佺墖鏂槸浠嶱HPNetToolpack鎽樺嚭锛岃缁嗙殑鎻忚堪瑙侊細

http://www.securityfocus.com/bid/4303

//test_6.php
system("traceroute $a_query",$ret_strs);
?>



鐢变簬绋嬪簭娌℃湁杩囨护$a_query鍙橀噺锛屾墍浠ユ敾鍑昏呭彲浠ョ敤鍒嗗彿鏉ヨ拷鍔犳墽琛屽懡浠ゃ

鏀诲嚮鑰呰緭鍏ュ涓嬭姹傚彲浠ユ墽琛宑at /etc/passwd鍛戒护锛

http://victim/test_6.php?a_query=www.example.com;cat /etc/passwd

PHP鐨勫懡浠ゆ墽琛屽嚱鏁拌繕鏈塻ystem(), passthru(), popen()鍜宍`绛夈傚懡浠ゆ墽琛屽嚱鏁伴潪甯稿嵄闄╋紝鎱庣敤銆傚鏋滆浣跨敤涓瀹氳涓ユ牸妫鏌ョ敤鎴疯緭鍏ャ

瑙e喅鏂规硶锛

瑕佹眰绋嬪簭鍛樹娇鐢╡scapeshellcmd()鍑芥暟杩囨护鐢ㄦ埛杈撳叆鐨剆hell鍛戒护銆

鍚敤safe_mode鍙互鏉滅粷寰堝鎵ц鍛戒护鐨勯棶棰橈紝涓嶈繃瑕佹敞鎰廝HP鐨勭増鏈竴瀹氳鏄渶鏂扮殑锛屽皬浜嶱HP-4.2.2鐨勯兘鍙兘缁曡繃safe_mode鐨勯檺鍒跺幓鎵ц鍛戒护銆

7銆乻ql_inject

濡備笅鐨凷QL璇彞濡傛灉鏈鍙橀噺杩涜澶勭悊灏变細瀛樺湪闂锛

select * from login where user="$user" and pass="$pass"



鏀诲嚮鑰呭彲浠ョ敤鎴峰悕鍜屽彛浠ら兘杈撳叆1" or 1="1缁曡繃楠岃瘉銆

涓嶈繃骞镐簭PHP鏈変竴涓粯璁ょ殑閫夐」magic_quotes_gpc = On锛岃閫夐」浣垮緱浠嶨ET, POST, COOKIE鏉ョ殑鍙橀噺鑷姩鍔犱簡addslashes()鎿嶄綔銆備笂闈QL璇彞鍙樻垚浜嗭細

select * from login where user="1" or
1="1" and pass="1" or 1="1"



浠庤岄伩鍏嶄簡姝ょ被sql_inject鏀诲嚮銆

瀵逛簬鏁板瓧绫诲瀷鐨勫瓧娈碉紝寰堝绋嬪簭鍛樹細杩欐牱鍐欙細

select * from test where id=$id



鐢变簬鍙橀噺娌℃湁鐢ㄥ崟寮曞彿鎵╄捣鏉ワ紝灏变細閫犳垚sql_inject鏀诲嚮銆傚垢浜廙ySQL鍔熻兘绠鍗曪紝娌℃湁sqlserver绛夋暟鎹簱鏈夋墽琛屽懡浠ょ殑SQL璇彞锛岃屼笖PHP鐨刴ysql_query()鍑芥暟涔熷彧鍏佽鎵ц涓鏉QL璇彞锛屾墍浠ョ敤鍒嗗彿闅斿紑澶氭潯SQL璇彞鐨勬敾鍑讳篃涓嶈兘濂忔晥銆備絾鏄敾鍑昏呰捣鐮佽繕鍙互璁╂煡璇㈣鍙ュ嚭閿欙紝娉勬紡绯荤粺鐨勪竴浜涗俊鎭紝鎴栬呬竴浜涙剰鎯充笉鍒扮殑鎯呭喌銆

瑙e喅鏂规硶锛

瑕佹眰绋嬪簭鍛樺鎵鏈夌敤鎴锋彁浜ょ殑瑕佹斁鍒癝QL璇彞鐨勫彉閲忚繘琛岃繃婊ゃ

鍗充娇鏄暟瀛楃被鍨嬬殑瀛楁锛屽彉閲忎篃瑕佺敤鍗曞紩鍙锋墿璧锋潵锛孧ySQL鑷繁浼氭妸瀛椾覆澶勭悊鎴愭暟瀛椼

鍦∕ySQL閲屼笉瑕佺粰PHP绋嬪簭楂樼骇鍒潈闄愮殑鐢ㄦ埛锛屽彧鍏佽瀵硅嚜宸辩殑搴撹繘琛屾搷浣滐紝杩欎篃閬垮厤浜嗙▼搴忓嚭鐜伴棶棰樿 SELECT INTO OUTFILE ... 杩欑鏀诲嚮銆

8銆佽鍛婂強閿欒淇℃伅

PHP榛樿鏄剧ず鎵鏈夌殑璀﹀憡鍙婇敊璇俊鎭細

error_reporting = E_ALL & ~E_NOTICE
display_errors = On



鍦ㄥ钩鏃跺紑鍙戣皟璇曟椂杩欓潪甯告湁鐢紝鍙互鏍规嵁璀﹀憡淇℃伅椹笂鎵惧埌绋嬪簭閿欒鎵鍦ㄣ

姝e紡搴旂敤鏃讹紝璀﹀憡鍙婇敊璇俊鎭鐢ㄦ埛涓嶇煡鎵鎺紝鑰屼笖缁欐敾鍑昏呮硠婕忎簡鑴氭湰鎵鍦ㄧ殑鐗╃悊璺緞锛屼负鏀诲嚮鑰呯殑杩涗竴姝ユ敾鍑绘彁渚涗簡鏈夊埄鐨勪俊鎭傝屼笖鐢变簬鑷繁娌℃湁璁块棶鍒伴敊璇殑鍦版柟锛屽弽鑰屼笉鑳藉強鏃朵慨鏀圭▼搴忕殑閿欒銆傛墍浠ユ妸PHP鐨勬墍鏈夎鍛婂強閿欒淇℃伅璁板綍鍒颁竴涓棩蹇楁枃浠舵槸闈炲父鏄庢櫤鐨勶紝鍗充笉缁欐敾鍑昏呮硠婕忕墿鐞嗚矾寰勶紝鍙堣兘璁╄嚜宸辩煡閬撶▼搴忛敊璇墍鍦ㄣ

淇敼php.ini涓叧浜嶦rror handling and logging閮ㄥ垎鍐呭锛

error_reporting = E_ALL
display_errors = Off
log_errors = On
error_log = /usr/local/apache/logs/php_error.log



鐒跺悗閲嶅惎apache锛屾敞鎰忔枃浠/usr/local/apache/logs/php_error.log蹇呴渶鍙互璁﹏obody鐢ㄦ埛鍙啓銆

9銆乨isable_functions

濡傛灉瑙夊緱鏈変簺鍑芥暟杩樻湁濞佽儊锛屽彲浠ヨ缃畃hp.ini閲岀殑disable_functions锛堣繖涓夐」涓嶈兘鍦╤ttpd.conf閲岃缃級锛屾瘮濡傦細

disable_functions = phpinfo, get_cfg_var



鍙互鎸囧畾澶氫釜鍑芥暟锛岀敤閫楀彿鍒嗗紑銆傞噸鍚痑pache鍚庯紝phpinfo, get_cfg_var鍑芥暟閮借绂佹浜嗐傚缓璁叧闂嚱鏁皃hpinfo, get_cfg_var锛岃繖涓や釜鍑芥暟瀹规槗娉勬紡鏈嶅姟鍣ㄤ俊鎭紝鑰屼笖娌℃湁瀹為檯鐢ㄥ銆

10銆乨isable_classes

杩欎釜閫夐」鏄粠PHP-4.3.2寮濮嬫墠鏈夌殑锛屽畠鍙互绂佺敤鏌愪簺绫伙紝濡傛灉鏈夊涓敤閫楀彿鍒嗛殧绫诲悕銆俤isable_classes涔熶笉鑳藉湪httpd.conf閲岃缃紝鍙兘鍦╬hp.ini閰嶇疆鏂囦欢閲屼慨鏀广

11銆乷pen_basedir

鍓嶉潰鍒嗘瀽渚嬬▼鐨勬椂鍊欎篃澶氭鎻愬埌鐢╫pen_basedir瀵硅剼鏈搷浣滆矾寰勮繘琛岄檺鍒讹紝杩欓噷鍐嶄粙缁嶄竴涓嬪畠鐨勭壒鎬с傜敤open_basedir鎸囧畾鐨勯檺鍒跺疄闄呬笂鏄墠缂锛屼笉鏄洰褰曞悕銆備篃灏辨槸璇 "open_basedir = /dir/incl" 涔熶細鍏佽璁块棶 "/dir/include" 鍜 "/dir/incls"锛屽鏋滃畠浠瓨鍦ㄧ殑璇濄傚鏋滆灏嗚闂檺鍒跺湪浠呬负鎸囧畾鐨勭洰褰曪紝鐢ㄦ枩绾跨粨鏉熻矾寰勫悕銆備緥濡傦細"open_basedir = /dir/incl/"銆

鍙互璁剧疆澶氫釜鐩綍锛屽湪Windows涓紝鐢ㄥ垎鍙峰垎闅旂洰褰曘傚湪浠讳綍鍏跺畠绯荤粺涓敤鍐掑彿鍒嗛殧鐩綍銆備綔涓篈pache妯″潡鏃讹紝鐖剁洰褰曚腑鐨刼pen_basedir璺緞鑷姩琚户鎵裤
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