KAIST-IS521 / 2018s-gitctf-team2

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exploit-bug1 #45

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/
---> 223ae44b1251
Step 7/9 : ADD . /src
---> e03138ff369b
Step 8/9 : RUN cd /src; make clean; make
---> Running in 13c38f944d09
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 13c38f944d09
---> 524155d14f6c
Step 9/9 : ENTRYPOINT ["/src/server", "4000"]
---> Running in dd912901de5b
Removing intermediate container dd912901de5b
---> fbd29c679c1d
Successfully built fbd29c679c1d
Successfully tagged 2018s-gitctf-team2-30944e62425132c5df42f9706244f4f6437d15cb:latest
6ea3fab862e80fe4d1bff73b92d20d2967aef231cafdca7bb44891c92d0a57e5

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

==========================
[*] Exploit returned : None
[*] Solution flag : 8jV1cFIX01
[*] Exploit returned a wrong flag string

[*] The exploit did not work.