KAIST-IS521 / 2018s-gitctf-team2

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exploit-bug1 #44

Closed sunnyeo closed 6 years ago

sunnyeo commented 6 years ago

-----BEGIN PGP MESSAGE----- Version: GnuPG v1

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softsec-is521 commented 6 years ago
About exploit-bug1 (exploit-service branch)
[*] Starting service from 2018s-gitctf-team2 (branch '30944e62425132c5df42f9706244f4f6437d15cb')
Sending build context to Docker daemon  302.6kB
Step 1/9 : FROM debian:latest
---> 8626492fecd3
Step 2/9 : RUN cd /etc/apt &&   sed -i 's/deb.debian.org/ftp.daumkakao.com/g' sources.list &&   sed -i 's/security.debian.org/ftp.daumkakao.com/g' sources.list
---> Using cache
---> 6158c0b6e89c
Step 3/9 : RUN apt-get update && apt-get install -y make gcc procps
---> Using cache
---> 37d88ec252ac
Step 4/9 : RUN apt-get install -y gdb
---> Using cache
---> 662a905d408d
Step 5/9 : RUN mkdir -p /var/ctf
---> Using cache
---> f104ee201070
Step 6/9 : COPY ./flag /var/ctf/
---> 2d213f7a936c
Step 7/9 : ADD . /src
---> 89523553b14b
Step 8/9 : RUN cd /src; make clean; make
---> Running in 3826d7358c5e
rm -f server cclient testing.o
gcc -z now -no-pie -o cclient -Wall tcp_client.c
tcp_client.c: In function 'message':
tcp_client.c:311:56: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
printf("Error, message to long, message length is: %d\n", strlen(text));
^
tcp_client.c:288:8: warning: variable 'command' set but not used [-Wunused-but-set-variable]
char *command, *handle, *text, *orig;
^~~~~~~
tcp_client.c: In function 'broadcast':
tcp_client.c:341:55: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t {aka long unsigned int}' [-Wformat=]
printf("Error, message to long, message length is: %d\n", strlen(text));
^
tcp_client.c:325:8: warning: variable 'command' set but not used [-Wunused-but-set-variable]
char *command, *text, *orig;
^~~~~~~
gcc -z now -no-pie -o server -Wall tcp_server.c
Removing intermediate container 3826d7358c5e
---> 44e6ee5a288c
Step 9/9 : ENTRYPOINT ["/src/server", "4000"]
---> Running in 11bcb0ad4e7f
Removing intermediate container 11bcb0ad4e7f
---> 6c4d1871f582
Successfully built 6c4d1871f582
Successfully tagged 2018s-gitctf-team2-30944e62425132c5df42f9706244f4f6437d15cb:latest
2b60b6fb180227151f5049e27ffcbd61f094232d80142b00eec3f8ce5dc46269

[*] Started service successfully
[*] Running exploit
[*] Failed to run exploit

==========================
[*] Exploit returned : None
[*] Solution flag : kgGt74eaJo
[*] Exploit returned a wrong flag string

[*] The exploit did not work.