From f9c69cbd47bbe43cf3755b62bd595940c6de2c2e Mon Sep 17 00:00:00 2001 From: danger Date: Sun, 20 Oct 2024 11:00:08 +0800 Subject: [PATCH] 1second-commit --- input/recv.i64 | Bin 208473 -> 208473 bytes output/recv_patch/recv.py | 12 +++++++ output/recv_patch/recv_src | Bin 0 -> 22936 bytes src/chat_log.json | 40 ++++++++++++++++++++++++ src/input/recv_extract/patch_recv.json | 8 +++++ src/output/recv_extract/patch_recv.json | 6 ++++ 6 files changed, 66 insertions(+) create mode 100644 output/recv_patch/recv.py create mode 100755 output/recv_patch/recv_src create mode 100644 src/input/recv_extract/patch_recv.json diff --git a/input/recv.i64 b/input/recv.i64 index 9f92919679995304b113f4eef437ff0b23d8a24d..7780bb8f5c75b61a0da256d75423eb7408b0548d 100644 GIT binary patch delta 69 zcmcb4hv()Uo(UE#Or1+rC)yYYq$^%%K4*61y(9NCui8!F+b0_`Hf{V@U(NSFT_~La Z2pAduaxgG7ch|Ic*D!AHu3o^oMiHxY0^jf%mfNnFt1WdEk&lJX{XRfXp6#H;*ew}$w)F2XC|}- zE00nkLa(j&s(3*yOYm{MYW0FV6j~lq&1p)&XP+mAC3I_mNd z*IjpIXJvoi_uJq1?Y+N!&e?mMU5>HH6kQV z5%WbE5HJ2ivV>G|h90t2fuTOF=K-Z%0~tv}1$2&-gfP^!kd$`06w<7sH|h!u6#-RD zJBO^6MIb~8a!8Vk$|Vto8a=nZpeh%^kYY5Qulr|cz8zx|Xi@5c4=FoC_h`FsYHI8# z(k`g&g4)i|gE|m~ns_oM{9mHuxx^EKL|M@`DG6a{vE6{S8_@cOuF!UdvJR$=M>5gB zr@k(2cRVQFh~vSKWDGU+7;5Uf5O$2q-4hv)hX_1QcULhh89Im~Qbf!C%i41ke6C$1Ly*!o?!y}or=p9U^V4R~G9+QAs6VHRi zV%3_}=XFFDww$rZWf!)biN^E~B@?Y(oHwx+xuw-KF#cVda zOUhhGO^iL`%C?jra%C>eCdR(+%3MfIjNR_aTtH2X?RI4@oF>Mub!9G?CdNMD%3LT- zjCH#*7f2Ih7rHVRMiXPpU6~7_iLrK9=7MlytjU$RFq#;f;>uhQO^jKt%!Saz*z50_ z{&E3?{u>$5c@o=of8z=v;{*98Me+kh^4&%9cZ%dYi{vjC$)7KhcNWPzisWrY@<@?9 zR3yiWi;Cp6`EvX3R*ydOvGC|i;q5PvcWvry-{1a3_`m_rw2;V7yQ*1;H~U)r zjn^ZHDqfG|#9jC9#R4&W4)aX?z0}|#S+S2m_Hf^>NBVNg{>G4aQ0ia%nk1v+;fG#3 zH~i2sPuO}a{LH(VDXxcd?V;G7$L}@g+=)hsk@}0mqeqTjiD7@t`DY;3rH{O)KI*^n z8Rk?DU;AnR2mj~;$8ju#59|=Im2Ez-!P39J|G3JFiiV?YvRbU7Fsa=^jnLsp(!#Rag&n?$`3;njX~jkfw(8mj{5(c&5m{+-@fg*7?}xYW!l*RINL|Hqc5<=ofkcSQ|IyJ_wq6q9)0G1UOuE3 zH0k&|*(?rdTK^K4DRkuMsB8UIaD4|l58G(K%Px`%npZlro8v5W%Zq9D%!8c+0Ji+gVJ3$bsmG_HE8FK{UZ}fIu0kYnFZq*L?52TtPmdU z91kDpJjPf8I-sD#faDSRAn|=1rlZ%xj~Zzyj!@*7tI|G*;hW$~c4X~10>F{`Y+>bc z9(89<`kqXa5txj?WCSK7Fd2c#2uw!c|6T-mzlCXSES>J|j|KZu$)RBHU_6${EDfHL zt`y{+5-2LGWvE?u&+Bl7>nlLE#jRf1M9m?vc63nT|wn9sNi^_ zKbTAehm)yH@RVq!xe2vg-ity@mJ$@A6%Jd|1EOpBrtmqfBk5G@V6wM+ur&>QX`bwg zxdI6(5iERJvpr{rK>72+{NHD@*MqJY&u0G}bkpnE>_oGm6)aF z23^km3zI2->)mXU@?KAfL_M<&y4ML&l+Q+!9@ORB6Egik5rI20GBs#AO;ba7Cq$-D zND{UC#r{io)a>WXGkPzK^5dZvEd+LHa*rS);cOUfp$*d9u` zN0%!v|G3;dS6*CWn;zegrd^s|rs=Sz*J!#+(>A0q1N=Q~6&@`xN zo2JF>TGi39G`QfRo{>amB-q~GvZ$r4xqU>6?Vnn>u%&I$`!y^+09!S@YLFJ|L;CaX zF;M7S>H9FkO8;lmLsCI*iwjkyv-h+fr zo4%Y{KIatl&HD`+K0JFjAp5&4zJrBUSpZ%g0$%yF?6WgyWZzBTTlBuR{uV0woFKfQ zjn@OTe-FrW1ljZ%?5R^{O}iho;lJRl+)EEN4Q1y;vtkfdR>eVxau4ZGe0o;LCsL(7o{WK)L*$%IhH5 z!uc>rH9PY;FqMpIjj#!N2$ZjdrE?oNo0;e9#J)#tFEM7G`-yF1;~pi(%<~knpAtJn zjG5;pWPvZSRlc{HQRG_&!1qVpsu?Ko9rM2fV*7r_l0Qv-5rWtEe(D~t|D+d0IIp6} zX69K4eD+dgb9`RQcQcsUcYv2!%46*%5Xvp(vGzIk+^T(o9&6u#P+?8$p~u=5s8yk9v;~W9E61*yYsY@Y>8gFA_UQ z>=k0nJZ}-JM4Ox}F=n0$Hn98v8r<1#z+?nK_Aa^dg7s#z9 z$M||Sl4D#vmy+8}adKCYd!F15a^vJaOU{eT!x8h|0<2d82Dbm#Q5{$Vm@#|A0EXQ}N^@0^X=< zRTZwH(s!fqUrXn^rEwc!+0JmGageU9Sq{tiEEJRcNfy+)?OQOb;c8=c1r_YwgEcL1 zI(w>;25NZOnA0FHBfGnr_$G!mSF5h6*$vfsS_;>^2Gzz&di3nxd$qbu-Umq^b|-xw zy|AifL(Ehqe>;{9c?XIoa}2EN>9VQ2U)@&2t3z!ii#)r>w~6_@@JequjV{Fz#Cfm` zI)Nq>%#Ff7Q}GOXCZnh3KChblZ~^4Z=T$SGSIvB7ocZiiXDovYubTPFIP=*H=5&Be zQ8QoJK|-fZKa*N&=Cl3slG`V@?c9C01?qA8RBzFfnM%4Z;IYz?1 zmmJqy_QT}nlKW3`?c{z*u9Mtha+i?%Ex93bZz3z>q*B&U&ox;YCzZ09Q==rDRLW*e z-Auws#hF*f&{fMx#c5=;%Q>kyP5zU>LyMD&b5$L?Ss!p-aIOYZqb3!}s!4@2T#cGk zz6w^zH5Ea5O!`Fy?O7t_a#6ur;M{QIbwA^l>DNq$w$s}mIS=hg{O9D)!9`atRm{1D$%m}qN?gc zRi0XOuO14^uqE}?*>|+`aqL%J_7ZYr?#p}wzSDdXH$%+ZhGAec5P`> z1-v(53t2zKI;FP0%F{Tzaf($}9>BaX6}?9l({%5!7N349Vl+d?K(+xVrWaLxsHzGL zQh{M@Gi7IS?VcqWOm4H?7Qv1xb7ok&fl{37c0>l_25Y8@#=JsYfsNej2Hg_bCAK=$ z@JSiMCPdC>hKYeYDPNai%GW;G$r~za&*uoB2Fo3OTMfTQjkh;9-i{gXvce;yymYu7tI-{Vf;634m1sqj6KCsiMTk?plEajM&#iU&rV>040R=T!6` zxgE@eQ*pr&r{Q*IZokuj!ml_LYXM(J809a^V&`^ehHpDyl=dHSATC24t>-(=SI~l= zI#sM7=s1U*>OBrF=r*D<$#ss*&~7#FSd537cNi2) zhD?USTmwComQ(d3U#sKz+K(J@rlO7KJJr56(-`%(ZY09@Z3knC2p+EBo4e{^iAZ0R zuZ9OZ+RxHIa|D}*G9!uDIsLIjEEVsC*q!PfI7hv&9&GLpHm`3BHuoix&3HSw_wwf9 zR5BCm%_LI*yVF|}y#uLaA~}+79!YG*vl`8r?w-L|8ih)|cd$D>V2t8;K%=>@w=YkY zPkwYqqp3(doy-#w-Kk+A-$af?M({($84KBwcw%v+Z!n39`jUBXGE1CJ@a`~`+ZR)L zfRBRkH;#?#J1&THtXbcAac2iKC@x>IVnby4hE>XCx;Hr-i^LJ6cp}o*Jrp0@D$?DW zgDdr>w5)~Cm%s-bGLma9-h*biRX>Keh`}VDMv>V_A|3Bf#GM>-w9 zG6wIl-hpIfpgR#AjHS%`(z3}bR&7|mHs^RGp}V&PM*3B2HduCCzHBX9sN3&W+&j>n zQX$x|0^V{jV$=4@SSlxBjYC`Yy+udp9T{dUk`gP~6LF^csXm_StN7${1p?0GX z9aMF0?7XmRdB+8vo6z=-_3JinDhxj!q=}lh$8}fGxt@`}KE%Rx7E7}06!GqQX6tZF z_h

@NPOEHIl8w8{@j8x<=Q2%fd6|(8|HfjSU-|h;7!6aXdw+fco9B&o!Z&qpnBq zjD_auA{m#Bn>KXjjgxt!UMnw=;l+uV^M!|p)cAIEbmh=)*-G?LwkejlVp#Oxgo`He zM!kH=UcY*4>iSm zTKju@TX9-P7BAA@r07qKw6?dm#uL4RBhi>re2;=I#dA~m5`gqoO64z?w&J@3{Pw_K z(MoUqE48%Z!hl0B6OG3DS_TAi%NYHygE>+Azf%G))!&Dt|9TNTDFm)Coyh;wP_e{xQGEa5kTk7xzYAkL zy(0Cog3@s?IF~kTQ*oM60$)%9=Uy-Gxn5XYbSj*?ti!R~b6bvSO#D#_e*StRj1$C~A@h5?)x_l80Rg=?sfo#Hk6 z{K95Ora#Gk`Q7hYaqq+w)qaY{Wte`@p5hUnlGVJb&M>5_01kxEy*tjxAW2sm_KLwMD zWQHPGh$dobXhxHf{=sBV_h2N7bt9G(BU?moa%gxkhPkSx?Zg_9zIY;zi7wT>HG&yF zwN><`x`$$s=*ZB}R+!{TSdGQ81jtk6!V&E`(bYQ=S&3CuXQXr8ibzC6R$Q`f`P$W7 z7GhZ(=?v@A@QMv0vTDux^OmoPtY5iuW9O#Grse0Y>5RzvLViCdWIkWRZ`SZDIt9Rc zzNq7t;%hgBD?WT;$1S9<+!Cz-j>P1mOU6a5&I*dTL?{5b>MsD)r+5k=xmPGa)FPt* z!T@5mr@qI7I2C-H2W4rqcomV=>!F3&H8PUMQ`~0C)a$!KpWKo}qJxoCjL%x@*dL)SnXP$H&qy5K0mJq}X)Ql*HFin;LaGm7 zdn8(-TN9{4Q7mF*2_BVCW5ZM+L{Nr^b<;p|!-E;oB3s@9wj~|w6)jw`h!&neP)f?f zrX@C@PniL1lUzxes&hwK7#=lXBLrvtN%%rW_h=y({w)|E(SlQWh|lh~L}NW8{jlp! z^y7TjqTHgHqMn{q>>-WjFHXrGrP2b z8NcH8Yqw%27{=7t@7MM3FS0lF7x({*+WtK4&^-S$t_^O{9j3^b72Dqqj4H;zJ3j{i zBJudnPsQVZ8w&I7gL-}sYWtwB-}ull)UCB66j`7sJuzZpNXUKBxP@wOsvZsKo%N5SOV zo9{~=4=RlnMp4tE?uciB=i7&xLQ*r-qzqnG#LbKAe;y^c10l~LDw%zk`3_~VzL5<* z3LAf(z1inA@FotD(Nj`RHaKtc@YvI*ySvXa-xcNkH71@vOvcWPBk#9T#n_wg?2Wfl zn``gFWb6&KVVrO8?%Udw-JU{ow|-+^Rb+4W9ecEWsrrrEDX^z6(|)sV-mC3RJw~5x z%}>*H{aW2EGWMsth+>Srp?na=@cF9GX@{5PgW!vGd9$?`qsiIr$}rB0dtNHmU0TBa zj%CW|112!qN3nglg#E#DmBGVB21TOSr0t92_qpZDeyl|O#!sY#{Z*aHev45oYQKR= z-D`)|Avv~E3Fi8BGDO~8GRK3N|8Nt|J$96Z%EvEIl(&BKld0EWyv!DLQ5L0x4199222 7 perm->5\nint __cdecl echo_handler(int sock)\n{\n char buffer[256]; // [rsp+10h] [rbp-100h] BYREF\n\n memset(buffer, 0, sizeof(buffer));\n if ( recv(sock, buffer, 0x400uLL, 0) <= 0 )\n return 0;\n printf(\"Message from client: %s\\n\", buffer);\n if ( send(sock, \"Hello from server\\n\", 0x12uLL, 0) <= 0 )\n return 0;\n puts(\"Hello message sent\");\n return 1;\n}\n\n\n//Function: main ->0x4199683 7 perm->5\nint __fastcall main(int argc, const char **argv, const char **envp)\n{\n uint16_t v3; // ax\n char client_addr_str[24]; // [rsp+0h] [rbp-40h] BYREF\n int addrlen; // [rsp+18h] [rbp-28h] BYREF\n int opt; // [rsp+1Ch] [rbp-24h] BYREF\n sockaddr_in address; // [rsp+20h] [rbp-20h] BYREF\n int new_socket; // [rsp+38h] [rbp-8h]\n int server_fd; // [rsp+3Ch] [rbp-4h]\n\n opt = 1;\n addrlen = 16;\n server_fd = socket(2, 1, 0);\n if ( !server_fd )\n {\n perror(\"socket failed\");\n exit(1);\n }\n if ( setsockopt(server_fd, 1, 15, &opt, 4u) )\n {\n perror(\"setsockopt\");\n exit(1);\n }\n address.sin_family = 2;\n address.sin_addr.s_addr = 0;\n address.sin_port = htons(0x2AFFu);\n if ( bind(server_fd, (const struct sockaddr *)&address, 0x10u) < 0 )\n {\n perror(\"bind failed\");\n exit(1);\n }\n if ( listen(server_fd, 3) < 0 )\n {\n perror(\"listen\");\n exit(1);\n }\n printf(\"TCP server listening on port %d\\n\", 11007);\n new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen);\n if ( new_socket < 0 )\n {\n perror(\"accept\");\n exit(1);\n }\n inet_ntop(2, &address.sin_addr, client_addr_str, 0x10u);\n v3 = ntohs(address.sin_port);\n printf(\"Accept %s:%d\\n\", client_addr_str, v3);\n while ( echo_handler(new_socket) )\n ;\n close(new_socket);\n return 0;\n}\n\n\n//Function: backdoor ->0x4200139 7 perm->5\nint __cdecl backdoor()\n{\n char *new_envp[2]; // [rsp+0h] [rbp-20h] BYREF\n char *new_argv[2]; // [rsp+10h] [rbp-10h] BYREF\n\n new_argv[1] = 0LL;\n new_envp[0] = \"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\";\n new_envp[1] = 0LL;\n dup2(4, 0);\n dup2(4, 1);\n dup2(4, 2);\n execve(\"/bin/sh\", new_argv, new_envp);\n return 0;\n}\n\n\n" + }, + { + "role": "assistant", + "content": "size=255, The buffer size should be set to 255 to ensure that there is enough space for the received data and to prevent buffer overflow. The buffer size should always be one less than the actual size to account for the null terminator." + } + ], + [ + { + "role": "user", + "content": "Please analyze whether the following program contains the risk of buffer overflow and only check recv function. If it actually exists then answer with 'yes, reason here', or else output 'no recv vulnerability'.\n//Function: echo_handler ->0x4199222 7 perm->5\nint __cdecl echo_handler(int sock)\n{\n char buffer[256]; // [rsp+10h] [rbp-100h] BYREF\n\n memset(buffer, 0, sizeof(buffer));\n if ( recv(sock, buffer, 0x400uLL, 0) <= 0 )\n return 0;\n printf(\"Message from client: %s\\n\", buffer);\n if ( send(sock, \"Hello from server\\n\", 0x12uLL, 0) <= 0 )\n return 0;\n puts(\"Hello message sent\");\n return 1;\n}\n\n\n//Function: main ->0x4199683 7 perm->5\nint __fastcall main(int argc, const char **argv, const char **envp)\n{\n uint16_t v3; // ax\n char client_addr_str[24]; // [rsp+0h] [rbp-40h] BYREF\n int addrlen; // [rsp+18h] [rbp-28h] BYREF\n int opt; // [rsp+1Ch] [rbp-24h] BYREF\n sockaddr_in address; // [rsp+20h] [rbp-20h] BYREF\n int new_socket; // [rsp+38h] [rbp-8h]\n int server_fd; // [rsp+3Ch] [rbp-4h]\n\n opt = 1;\n addrlen = 16;\n server_fd = socket(2, 1, 0);\n if ( !server_fd )\n {\n perror(\"socket failed\");\n exit(1);\n }\n if ( setsockopt(server_fd, 1, 15, &opt, 4u) )\n {\n perror(\"setsockopt\");\n exit(1);\n }\n address.sin_family = 2;\n address.sin_addr.s_addr = 0;\n address.sin_port = htons(0x2AFFu);\n if ( bind(server_fd, (const struct sockaddr *)&address, 0x10u) < 0 )\n {\n perror(\"bind failed\");\n exit(1);\n }\n if ( listen(server_fd, 3) < 0 )\n {\n perror(\"listen\");\n exit(1);\n }\n printf(\"TCP server listening on port %d\\n\", 11007);\n new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen);\n if ( new_socket < 0 )\n {\n perror(\"accept\");\n exit(1);\n }\n inet_ntop(2, &address.sin_addr, client_addr_str, 0x10u);\n v3 = ntohs(address.sin_port);\n printf(\"Accept %s:%d\\n\", client_addr_str, v3);\n while ( echo_handler(new_socket) )\n ;\n close(new_socket);\n return 0;\n}\n\n\n//Function: backdoor ->0x4200139 7 perm->5\nint __cdecl backdoor()\n{\n char *new_envp[2]; // [rsp+0h] [rbp-20h] BYREF\n char *new_argv[2]; // [rsp+10h] [rbp-10h] BYREF\n\n new_argv[1] = 0LL;\n new_envp[0] = \"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\";\n new_envp[1] = 0LL;\n dup2(4, 0);\n dup2(4, 1);\n dup2(4, 2);\n execve(\"/bin/sh\", new_argv, new_envp);\n return 0;\n}\n\n\n" + }, + { + "role": "assistant", + "content": "Yes, reason: The recv function in the echo_handler function does not check the size of the buffer being passed to it. It receives up to 0x400 bytes of data into the buffer, which is only 256 bytes in size. This can lead to a buffer overflow vulnerability if more than 256 bytes of data are received, potentially causing a buffer overflow and overwriting adjacent memory." + } + ], + [ + { + "role": "user", + "content": "There is a risk of buffer overflow when using recv in the program. Please tell me the specific size be prepared for recv to ensure the program work safely. Answer with 'size=value, ', and then give me the reason.\n//Function: echo_handler ->0x4199222 7 perm->5\nint __cdecl echo_handler(int sock)\n{\n char buffer[256]; // [rsp+10h] [rbp-100h] BYREF\n\n memset(buffer, 0, sizeof(buffer));\n if ( recv(sock, buffer, 0x400uLL, 0) <= 0 )\n return 0;\n printf(\"Message from client: %s\\n\", buffer);\n if ( send(sock, \"Hello from server\\n\", 0x12uLL, 0) <= 0 )\n return 0;\n puts(\"Hello message sent\");\n return 1;\n}\n\n\n//Function: main ->0x4199683 7 perm->5\nint __fastcall main(int argc, const char **argv, const char **envp)\n{\n uint16_t v3; // ax\n char client_addr_str[24]; // [rsp+0h] [rbp-40h] BYREF\n int addrlen; // [rsp+18h] [rbp-28h] BYREF\n int opt; // [rsp+1Ch] [rbp-24h] BYREF\n sockaddr_in address; // [rsp+20h] [rbp-20h] BYREF\n int new_socket; // [rsp+38h] [rbp-8h]\n int server_fd; // [rsp+3Ch] [rbp-4h]\n\n opt = 1;\n addrlen = 16;\n server_fd = socket(2, 1, 0);\n if ( !server_fd )\n {\n perror(\"socket failed\");\n exit(1);\n }\n if ( setsockopt(server_fd, 1, 15, &opt, 4u) )\n {\n perror(\"setsockopt\");\n exit(1);\n }\n address.sin_family = 2;\n address.sin_addr.s_addr = 0;\n address.sin_port = htons(0x2AFFu);\n if ( bind(server_fd, (const struct sockaddr *)&address, 0x10u) < 0 )\n {\n perror(\"bind failed\");\n exit(1);\n }\n if ( listen(server_fd, 3) < 0 )\n {\n perror(\"listen\");\n exit(1);\n }\n printf(\"TCP server listening on port %d\\n\", 11007);\n new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen);\n if ( new_socket < 0 )\n {\n perror(\"accept\");\n exit(1);\n }\n inet_ntop(2, &address.sin_addr, client_addr_str, 0x10u);\n v3 = ntohs(address.sin_port);\n printf(\"Accept %s:%d\\n\", client_addr_str, v3);\n while ( echo_handler(new_socket) )\n ;\n close(new_socket);\n return 0;\n}\n\n\n//Function: backdoor ->0x4200139 7 perm->5\nint __cdecl backdoor()\n{\n char *new_envp[2]; // [rsp+0h] [rbp-20h] BYREF\n char *new_argv[2]; // [rsp+10h] [rbp-10h] BYREF\n\n new_argv[1] = 0LL;\n new_envp[0] = \"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\";\n new_envp[1] = 0LL;\n dup2(4, 0);\n dup2(4, 1);\n dup2(4, 2);\n execve(\"/bin/sh\", new_argv, new_envp);\n return 0;\n}\n\n\n" + }, + { + "role": "assistant", + "content": "size=255, The buffer size should be set to 255 to ensure that there is enough space for the received data and to prevent buffer overflow. In this case, the buffer size is set to 256, which leaves room for a null terminator at the end of the string." + } + ], + [ + { + "role": "user", + "content": "Please analyze whether the following program contains the risk of buffer overflow and only check recv function. If it actually exists then answer with 'yes, reason here', or else output 'no recv vulnerability'.\n//Function: echo_handler ->0x4199222 7 perm->5\nint __cdecl echo_handler(int sock)\n{\n char buffer[256]; // [rsp+10h] [rbp-100h] BYREF\n\n memset(buffer, 0, sizeof(buffer));\n if ( recv(sock, buffer, 0x400uLL, 0) <= 0 )\n return 0;\n printf(\"Message from client: %s\\n\", buffer);\n if ( send(sock, \"Hello from server\\n\", 0x12uLL, 0) <= 0 )\n return 0;\n puts(\"Hello message sent\");\n return 1;\n}\n\n\n//Function: main ->0x4199683 7 perm->5\nint __fastcall main(int argc, const char **argv, const char **envp)\n{\n uint16_t v3; // ax\n char client_addr_str[24]; // [rsp+0h] [rbp-40h] BYREF\n int addrlen; // [rsp+18h] [rbp-28h] BYREF\n int opt; // [rsp+1Ch] [rbp-24h] BYREF\n sockaddr_in address; // [rsp+20h] [rbp-20h] BYREF\n int new_socket; // [rsp+38h] [rbp-8h]\n int server_fd; // [rsp+3Ch] [rbp-4h]\n\n opt = 1;\n addrlen = 16;\n server_fd = socket(2, 1, 0);\n if ( !server_fd )\n {\n perror(\"socket failed\");\n exit(1);\n }\n if ( setsockopt(server_fd, 1, 15, &opt, 4u) )\n {\n perror(\"setsockopt\");\n exit(1);\n }\n address.sin_family = 2;\n address.sin_addr.s_addr = 0;\n address.sin_port = htons(0x2AFFu);\n if ( bind(server_fd, (const struct sockaddr *)&address, 0x10u) < 0 )\n {\n perror(\"bind failed\");\n exit(1);\n }\n if ( listen(server_fd, 3) < 0 )\n {\n perror(\"listen\");\n exit(1);\n }\n printf(\"TCP server listening on port %d\\n\", 11007);\n new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen);\n if ( new_socket < 0 )\n {\n perror(\"accept\");\n exit(1);\n }\n inet_ntop(2, &address.sin_addr, client_addr_str, 0x10u);\n v3 = ntohs(address.sin_port);\n printf(\"Accept %s:%d\\n\", client_addr_str, v3);\n while ( echo_handler(new_socket) )\n ;\n close(new_socket);\n return 0;\n}\n\n\n//Function: backdoor ->0x4200139 7 perm->5\nint __cdecl backdoor()\n{\n char *new_envp[2]; // [rsp+0h] [rbp-20h] BYREF\n char *new_argv[2]; // [rsp+10h] [rbp-10h] BYREF\n\n new_argv[1] = 0LL;\n new_envp[0] = \"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin\";\n new_envp[1] = 0LL;\n dup2(4, 0);\n dup2(4, 1);\n dup2(4, 2);\n execve(\"/bin/sh\", new_argv, new_envp);\n return 0;\n}\n\n\n" + }, + { + "role": "assistant", + "content": "Yes, reason: The recv function in the echo_handler function does not check the size of the buffer before reading data into it. The buffer size is defined as 256 bytes, but the recv function reads up to 0x400 bytes into the buffer, which can lead to a buffer overflow vulnerability." + } ] ] \ No newline at end of file diff --git a/src/input/recv_extract/patch_recv.json b/src/input/recv_extract/patch_recv.json new file mode 100644 index 0000000..b8544d1 --- /dev/null +++ b/src/input/recv_extract/patch_recv.json @@ -0,0 +1,8 @@ +[ + { + "file_name": "../input/recv_extract.c", + "vul_info": " reason: The recv function in the echo_handler function does not check the size of the buffer being passed to it. It receives up to 0x400 bytes of data into the buffer, which is only 256 bytes in size. This can lead to a buffer overflow vulnerability if more than 256 bytes of data are received, potentially causing a buffer overflow and overwriting adjacent memory.", + "fix_size": 255, + "patch_info": "The buffer size should be set to 255 to ensure that there is enough space for the received data and to prevent buffer overflow. The buffer size should always be one less than the actual size to account for the null terminator." + } +] \ No newline at end of file diff --git a/src/output/recv_extract/patch_recv.json b/src/output/recv_extract/patch_recv.json index 538911e..6183016 100644 --- a/src/output/recv_extract/patch_recv.json +++ b/src/output/recv_extract/patch_recv.json @@ -40,5 +40,11 @@ "vul_info": " the program contains a risk of buffer overflow in the recv function. The recv function is called with a buffer size of 0x400 (1024 bytes), but the buffer allocated in the echo_handler function is only 256 bytes. This means that if the recv function receives more than 256 bytes of data, it will overflow the buffer and potentially overwrite other memory areas.", "fix_size": 255, "patch_info": "The buffer size should be set to 255 to ensure that there is enough space for the received data plus a null terminator. This will prevent buffer overflow and ensure the program works safely." + }, + { + "file_name": "recv_extract.c", + "vul_info": " reason: The recv function in the echo_handler function does not check the size of the buffer before reading data into it. The buffer size is defined as 256 bytes, but the recv function reads up to 0x400 bytes into the buffer, which can lead to a buffer overflow vulnerability.", + "fix_size": 255, + "patch_info": "The buffer size should be set to 255 to ensure that there is enough space for the received data and to prevent buffer overflow. In this case, the buffer size is set to 256, which leaves room for a null terminator at the end of the string." } ] \ No newline at end of file