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Quine
Challenge
This service is really strange… It seems to accept only C programs. Can you get us the flag? nc quine.vuln.icec.tf 5500
Solution
Found a quine on the internet:
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main(){char *c="main(){char *c=%c%s%c;printf(c,34,c,34);}";printf(c,34,c,34);}
.
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$ cat tmp.c | nc quine.vuln.icec.tf 5500
Please provide source file (up to 2048 bytes), ending with a dot by itself on a line
[INFO] server.c:161 (2439) Fri 12 Aug 2016 17:10:32 File upload complete!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:32 Survived iteration #1!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:32 Survived iteration #2!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #3!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #4!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #5!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #6!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #7!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #8!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #9!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #10!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #11!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #12!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #13!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #14!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #15!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #16!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #17!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #18!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #19!
[INFO] server.c:436 (2439) Fri 12 Aug 2016 17:10:33 Survived iteration #20!
[INFO] server.c:438 (2439) Fri 12 Aug 2016 17:10:33 Echoing surviving source back
main(){char *c="main(){char *c=%c%s%c;printf(c,34,c,34);}";printf(c,34,c,34);}
Flag