bash26

Analyze the binary and identify vulnerabilities within initialize_shell_variables.

Dr.Binary

Function ghidra_open_server called with arguments: {"filepath":"/sandbox/bash26"}

Tool result
[
  {
    "type": "text",
    "text": "Success"
  }
]

Function ghidra_search_functions_by_name called with arguments: {"filepath":"/sandbox/bash26","query":"initialize_shell_variables"}

Tool result
[
  {
    "type": "text",
    "text": "initialize_shell_variables @ 00150230"
  }
]

Function ghidra_decompile_function called with arguments: {"filepath":"/sandbox/bash26","name_or_address":"00150230"}

Tool result
[
  {
    "type": "text",
    "text": "Decompilation succeeded, and the artifact is saved at /sandbox/ghidra/decompiled_0x150230.txt. Please find the table of contents below. \n[{'funcName': 'create_variable_tables', 'lineNum': 34}, {'funcName': 'set_pwd', 'lineNum': 47}, {'funcName': 'set_if_not', 'lineNum': 48}, {'funcName': 'getpid', 'lineNum': 49}, {'funcName': 'set_if_not', 'lineNum': 50}, {'funcName': 'set_if_not', 'lineNum': 51}, {'funcName': 'set_if_not', 'lineNum': 53}, {'funcName': 'set_if_not', 'lineNum': 54}, {'funcName': 'set_if_not', 'lineNum': 56}, {'funcName': 'bind_variable', 'lineNum': 57}, {'funcName': 'setifs', 'lineNum': 58}, {'funcName': 'set_if_not', 'lineNum': 59}, {'funcName': 'set_if_not', 'lineNum': 60}, {'funcName': 'set_if_not', 'lineNum': 61}, {'funcName': 'set_if_not', 'lineNum': 62}, {'funcName': 'create_variable_tables', 'lineNum': 69}, {'funcName': 'find_variable', 'lineNum': 71}, {'funcName': 'bind_variable_internal', 'lineNum': 73}, {'funcName': 'adjust_shell_level', 'lineNum': 77}, {'funcName': 'set_ppid', 'lineNum': 78}, {'funcName': 'bind_variable', 'lineNum': 79}, {'funcName': 'getopts_reset', 'lineNum': 81}, {'funcName': 'bind_variable', 'lineNum': 82}, {'funcName': 'find_variable', 'lineNum': 86}, {'funcName': 'get_current_user_info', 'lineNum': 89}, {'funcName': 'bind_variable', 'lineNum': 91}, {'funcName': 'get_current_user_info', 'lineNum': 97}, {'funcName': 'strlen', 'lineNum': 100}, {'funcName': 'strlen', 'lineNum': 109}, {'funcName': 'find_variable', 'lineNum': 114}, {'funcName': 'get_variable_value', 'lineNum': 116}, {'funcName': 'strlen', 'lineNum': 117}, {'funcName': 'strlen', 'lineNum': 118}, {'funcName': 'sh_xmalloc', 'lineNum': 119}, {'funcName': 'strcpy', 'lineNum': 120}, {'funcName': 'strcpy', 'lineNum': 121}, {'funcName': 'strlen', 'lineNum': 125}, {'funcName': 'find_user_command', 'lineNum': 130}, {'funcName': 'full_pathname', 'lineNum': 132}, {'funcName': 'sh_xfree', 'lineNum': 133}, {'funcName': 'file_status', 'lineNum': 136}, {'funcName': 'find_variable', 'lineNum': 138}, {'funcName': 'get_variable_value', 'lineNum': 140}, {'funcName': 'make_absolute', 'lineNum': 142}, {'funcName': 'sh_canonpath', 'lineNum': 143}, {'funcName': 'sh_xfree', 'lineNum': 144}, {'funcName': 'get_current_user_info', 'lineNum': 150}, {'funcName': 'strlen', 'lineNum': 153}, {'funcName': 'sh_xmalloc', 'lineNum': 158}, {'funcName': 'strcpy', 'lineNum': 159}, {'funcName': 'bind_variable', 'lineNum': 161}, {'funcName': 'sh_xfree', 'lineNum': 162}, {'funcName': 'find_variable', 'lineNum': 163}, {'funcName': 'get_current_user_info', 'lineNum': 166}, {'funcName': 'bind_variable', 'lineNum': 168}, {'funcName': 'shell_version_string', 'lineNum': 170}, {'funcName': 'bind_variable', 'lineNum': 172}, {'funcName': 'unbind_variable', 'lineNum': 173}, {'funcName': 'make_new_variable', 'lineNum': 174}, {'funcName': 'array_create', 'lineNum': 175}, {'funcName': '__strcpy_chk', 'lineNum': 178}, {'funcName': 'strchr', 'lineNum': 179}, {'funcName': 'array_insert', 'lineNum': 184}, {'funcName': 'array_insert', 'lineNum': 185}, {'funcName': 'inttostr', 'lineNum': 186}, {'funcName': 'array_insert', 'lineNum': 187}, {'funcName': 'inttostr', 'lineNum': 188}, {'funcName': 'array_insert', 'lineNum': 189}, {'funcName': 'array_insert', 'lineNum': 190}, {'funcName': 'array_insert', 'lineNum': 191}, {'funcName': 'bind_variable', 'lineNum': 195}, {'funcName': 'find_variable', 'lineNum': 197}, {'funcName': 'find_variable', 'lineNum': 199}, {'funcName': 'find_variable', 'lineNum': 201}, {'funcName': 'posix_initialize', 'lineNum': 203}, {'funcName': 'posix_readline_initialize', 'lineNum': 205}, {'funcName': 'set_shellopts', 'lineNum': 207}, {'funcName': 'bash_tilde_expand', 'lineNum': 214}, {'funcName': 'set_if_not', 'lineNum': 215}, {'funcName': 'sh_xfree', 'lineNum': 216}, {'funcName': 'gettimeofday', 'lineNum': 218}, {'funcName': 'getpid', 'lineNum': 219}, {'funcName': 'find_variable', 'lineNum': 223}, {'funcName': 'find_variable', 'lineNum': 225}, {'funcName': 'sv_ignoreeof', 'lineNum': 227}, {'funcName': 'sv_history_control', 'lineNum': 230}, {'funcName': 'setup_history_ignore', 'lineNum': 231}, {'funcName': 'find_variable', 'lineNum': 232}, {'funcName': 'inttostr', 'lineNum': 239}, {'funcName': 'find_variable', 'lineNum': 240}, {'funcName': 'bind_variable', 'lineNum': 242}, {'funcName': 'inttostr', 'lineNum': 246}, {'funcName': 'find_variable', 'lineNum': 248}, {'funcName': 'bind_variable', 'lineNum': 250}, {'funcName': 'find_variable', 'lineNum': 253}, {'funcName': 'sv_xtracefd', 'lineNum': 255}, {'funcName': 'find_variable', 'lineNum': 257}, {'funcName': 'legal_number', 'lineNum': 259}, {'funcName': 'bind_variable', 'lineNum': 265}, {'funcName': 'bind_variable', 'lineNum': 268}, {'funcName': 'bind_variable', 'lineNum': 271}, {'funcName': 'bind_variable', 'lineNum': 274}, {'funcName': 'bind_variable', 'lineNum': 278}, {'funcName': 'bind_variable', 'lineNum': 282}, {'funcName': 'bind_variable', 'lineNum': 286}, {'funcName': 'bind_variable', 'lineNum': 290}, {'funcName': 'find_variable', 'lineNum': 293}, {'funcName': 'make_new_variable', 'lineNum': 295}, {'funcName': 'array_create', 'lineNum': 296}, {'funcName': 'find_variable', 'lineNum': 302}, {'funcName': 'make_new_variable', 'lineNum': 304}, {'funcName': 'array_create', 'lineNum': 305}, {'funcName': 'find_variable', 'lineNum': 312}, {'funcName': 'make_new_variable', 'lineNum': 314}, {'funcName': 'array_create', 'lineNum': 315}, {'funcName': 'find_variable', 'lineNum': 321}, {'funcName': 'make_new_variable', 'lineNum': 323}, {'funcName': 'array_create', 'lineNum': 324}, {'funcName': 'find_variable', 'lineNum': 330}, {'funcName': 'make_new_variable', 'lineNum': 332}, {'funcName': 'array_create', 'lineNum': 333}, {'funcName': 'find_variable', 'lineNum': 339}, {'funcName': 'make_new_variable', 'lineNum': 341}, {'funcName': 'array_create', 'lineNum': 342}, {'funcName': 'find_variable', 'lineNum': 348}, {'funcName': 'make_new_variable', 'lineNum': 350}, {'funcName': 'hash_create', 'lineNum': 351}, {'funcName': 'find_variable', 'lineNum': 357}, {'funcName': 'make_new_variable', 'lineNum': 359}, {'funcName': 'hash_create', 'lineNum': 360}, {'funcName': 'find_variable', 'lineNum': 366}, {'funcName': 'make_new_variable', 'lineNum': 368}, {'funcName': 'array_create', 'lineNum': 369}, {'funcName': '__stack_chk_fail', 'lineNum': 380}, {'funcName': 'strncmp', 'lineNum': 389}, {'funcName': 'strlen', 'lineNum': 390}, {'funcName': 'sh_xmalloc', 'lineNum': 391}, {'funcName': 'strcpy', 'lineNum': 392}, {'funcName': 'strcpy', 'lineNum': 394}, {'funcName': 'legal_identifier', 'lineNum': 395}, {'funcName': 'parse_and_execute', 'lineNum': 397}, {'funcName': 'hash_search', 'lineNum': 400}, {'funcName': 'bind_variable', 'lineNum': 410}, {'funcName': 'dcgettext', 'lineNum': 413}, {'funcName': 'report_error', 'lineNum': 414}, {'funcName': 'dcgettext', 'lineNum': 420}, {'funcName': 'report_error', 'lineNum': 421}, {'funcName': 'strcmp', 'lineNum': 425}, {'funcName': 'find_variable', 'lineNum': 426}, {'funcName': 'bind_variable', 'lineNum': 434}, {'funcName': 'legal_identifier', 'lineNum': 441}, {'funcName': 'strlen', 'lineNum': 463}, {'funcName': 'sh_xmalloc', 'lineNum': 464}, {'funcName': 'strcpy', 'lineNum': 465}]"
  }
]

Function ghidra_read_artifact called with arguments: {"artifact_path":"/sandbox/ghidra/decompiled_0x150230.txt"}

Tool result
[
  {
    "type": "text",
    "text": "\nvoid initialize_shell_variables(char **env,int privmode)\n\n{\n  char *pcVar1;\n  char cVar2;\n  long lVar3;\n  undefined *puVar4;\n  undefined *puVar5;\n  __pid_t _Var6;\n  int iVar7;\n  uint uVar8;\n  int iVar9;\n  uint uVar10;\n  SHELL_VAR *pSVar11;\n  char *pcVar12;\n  ARRAY *pAVar13;\n  char *__dest;\n  BUCKET_CONTENTS *pBVar14;\n  HASH_TABLE *pHVar15;\n  size_t sVar16;\n  size_t sVar17;\n  char *pcVar18;\n  int iVar19;\n  size_t bytes;\n  char **ppcVar20;\n  long in_FS_OFFSET;\n  timeval tv;\n  char b [12];\n  char d [32];\n  \n  puVar4 = PTR_null_array_assign_00208ec8;\n  lVar3 = *(long *)(in_FS_OFFSET + 0x28);\n  create_variable_tables();\n  pcVar18 = *env;\n  ppcVar20 = env + 1;\njoined_r0x0015027f:\n  pcVar12 = pcVar18;\n  if (pcVar18 != (char *)0x0) {\nLAB_00150299:\n    cVar2 = *pcVar18;\n    pcVar18 = pcVar18 + 1;\n    if (cVar2 != '\\0') goto LAB_00150290;\n    goto LAB_001502a4;\n  }\nLAB_001502b1:\n  set_pwd();\n  set_if_not(\"_\",dollar_vars[0]);\n  dollar_dollar_pid = getpid();\n  set_if_not(\"PATH\",\"/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:.\");\n  set_if_not(\"TERM\",\"dumb\");\n  if (interactive_shell != 0) {\n    set_if_not(\"PS1\",primary_prompt);\n    set_if_not(\"PS2\",secondary_prompt);\n  }\n  set_if_not(\"PS4\",\"+ \");\n  pSVar11 = bind_variable(\"IFS\",\" \\t\\n\",0);\n  setifs(pSVar11);\n  set_if_not(\"HOSTTYPE\",\"x86_64\");\n  set_if_not(\"OSTYPE\",\"linux-gnu\");\n  set_if_not(\"MACHTYPE\",\"x86_64-unknown-linux-gnu\");\n  set_if_not(\"HOSTNAME\",current_host_name);\n  if (interactive_shell != 0) {\n    pcVar18 = \"60\";\n    if (posixly_correct != 0) {\n      pcVar18 = \"600\";\n    }\n    if (shell_variables == (VAR_CONTEXT *)0x0) {\n      create_variable_tables();\n    }\n    pSVar11 = find_variable(\"MAILCHECK\");\n    if (pSVar11 == (SHELL_VAR *)0x0) {\n      pSVar11 = bind_variable_internal(\"MAILCHECK\",pcVar18,global_variables->table,1,0);\n    }\n    pSVar11->attributes = pSVar11->attributes | 0x10;\n  }\n  adjust_shell_level(1);\n  set_ppid();\n  pSVar11 = bind_variable(\"OPTIND\",\"1\",0);\n  pSVar11->attributes = pSVar11->attributes | 0x10;\n  getopts_reset(0);\n  bind_variable(\"OPTERR\",\"1\",0);\n  sh_opterr = 1;\n  if (login_shell == 1) {\n    if (posixly_correct == 0) {\n      pSVar11 = find_variable(\"HOME\");\n      if (pSVar11 == (SHELL_VAR *)0x0) {\n        if (current_user.home_dir == (char *)0x0) {\n          get_current_user_info();\n        }\n        bind_variable(\"HOME\",current_user.home_dir,0);\n      }\n      if (login_shell != 1) goto LAB_00150435;\n    }\n    if (*shell_name == '/') goto LAB_001510d3;\n    if (current_user.shell == (char *)0x0) {\n      get_current_user_info();\n    }\n    pcVar18 = current_user.shell;\n    sVar16 = strlen(current_user.shell);\n    iVar7 = 0x2b5;\n    bytes = sVar16 + 1;\n  }\n  else {\nLAB_00150435:\n    if (*shell_name == '/') {\nLAB_001510d3:\n      pcVar18 = shell_name;\n      sVar16 = strlen(shell_name);\n      iVar7 = 0x2b8;\n      bytes = sVar16 + 1;\n    }\n    else if ((*shell_name == '.') && (shell_name[1] == '/')) {\n      pSVar11 = find_variable(\"PWD\");\n      if ((pSVar11 != (SHELL_VAR *)0x0) &&\n         (pcVar18 = get_variable_value(pSVar11), pcVar18 != (char *)0x0)) {\n        sVar16 = strlen(pcVar18);\n        sVar17 = strlen(shell_name);\n        pcVar12 = (char *)sh_xmalloc((long)(int)sVar16 + 1 + sVar17,\"variables.c\",0x2c3);\n        strcpy(pcVar12,pcVar18);\n        strcpy(pcVar12 + (int)sVar16,shell_name + 1);\n        goto LAB_00150488;\n      }\n      pcVar18 = shell_name;\n      sVar16 = strlen(shell_name);\n      iVar7 = 0x2c8;\n      bytes = sVar16 + 1;\n    }\n    else {\n      pcVar18 = find_user_command(shell_name);\n      if (pcVar18 != (char *)0x0) {\n        pcVar12 = full_pathname(pcVar18);\n        sh_xfree(pcVar18,\"variables.c\",0x2ee);\n        goto LAB_00150488;\n      }\n      uVar10 = file_status(shell_name);\n      if ((uVar10 & 2) != 0) {\n        pSVar11 = find_variable(\"PWD\");\n        if (pSVar11 != (SHELL_VAR *)0x0) {\n          pSVar11 = (SHELL_VAR *)get_variable_value(pSVar11);\n        }\n        pcVar12 = make_absolute(shell_name,(char *)pSVar11);\n        if ((*shell_name == '.') && (pcVar18 = sh_canonpath(pcVar12,3), pcVar18 != (char *)0x0)) {\n          sh_xfree(pcVar12,\"variables.c\",0x2df);\n          pcVar12 = pcVar18;\n        }\n        goto LAB_00150488;\n      }\n      if (current_user.shell == (char *)0x0) {\n        get_current_user_info();\n      }\n      pcVar18 = current_user.shell;\n      sVar16 = strlen(current_user.shell);\n      iVar7 = 0x2e8;\n      bytes = sVar16 + 1;\n    }\n  }\n  pcVar12 = (char *)sh_xmalloc(bytes,\"variables.c\",iVar7);\n  pcVar12 = strcpy(pcVar12,pcVar18);\nLAB_00150488:\n  bind_variable(\"BASH\",pcVar12,0);\n  sh_xfree(pcVar12,\"variables.c\",0x205);\n  pSVar11 = find_variable(\"SHELL\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    if (current_user.shell == (char *)0x0) {\n      get_current_user_info();\n    }\n    bind_variable(\"SHELL\",current_user.shell,0);\n  }\n  pcVar12 = shell_version_string();\n  pcVar18 = (char *)0x0;\n  bind_variable(\"BASH_VERSION\",pcVar12,0);\n  unbind_variable(\"BASH_VERSINFO\");\n  pSVar11 = make_new_variable(\"BASH_VERSINFO\",global_variables->table);\n  pAVar13 = array_create();\n  pSVar11->attributes = pSVar11->attributes | 4;\n  pSVar11->value = (char *)pAVar13;\n  __strcpy_chk(d,dist_version,0x20);\n  pcVar12 = strchr(d,0x2e);\n  if (pcVar12 != (char *)0x0) {\n    *pcVar12 = '\\0';\n    pcVar18 = pcVar12 + 1;\n  }\n  array_insert(pAVar13,0,d);\n  array_insert(pAVar13,1,pcVar18);\n  pcVar18 = inttostr((long)patch_level,b,0xc);\n  array_insert(pAVar13,2,pcVar18);\n  pcVar18 = inttostr((long)build_version,b,0xc);\n  array_insert(pAVar13,3,pcVar18);\n  array_insert(pAVar13,4,release_status);\n  array_insert(pAVar13,5,\"x86_64-unknown-linux-gnu\");\n  pcVar18 = command_execution_string;\n  pSVar11->attributes = pSVar11->attributes | 2;\n  if (pcVar18 != (char *)0x0) {\n    bind_variable(\"BASH_EXECUTION_STRING\",pcVar18,0);\n  }\n  pSVar11 = find_variable(\"POSIXLY_CORRECT\");\n  if (((pSVar11 != (SHELL_VAR *)0x0) ||\n      (pSVar11 = find_variable(\"POSIX_PEDANTIC\"), pSVar11 != (SHELL_VAR *)0x0)) &&\n     ((pSVar11->attributes & 0x8000) != 0)) {\n    pSVar11 = find_variable(pSVar11->name);\n    posixly_correct = (int)(pSVar11 != (SHELL_VAR *)0x0);\n    posix_initialize(posixly_correct);\n    if (interactive_shell != 0) {\n      posix_readline_initialize(posixly_correct);\n    }\n    set_shellopts();\n  }\n  if (remember_on_history != 0) {\n    pcVar18 = \"~/.bash_history\";\n    if (posixly_correct != 0) {\n      pcVar18 = \"~/.sh_history\";\n    }\n    pcVar18 = bash_tilde_expand(pcVar18,0);\n    set_if_not(\"HISTFILE\",pcVar18);\n    sh_xfree(pcVar18,\"variables.c\",0x227);\n  }\n  gettimeofday((timeval *)&tv,(__timezone_ptr_t)0x0);\n  _Var6 = getpid();\n  last_random_value = 0;\n  rseed = (long)_Var6 ^ tv.tv_sec ^ tv.tv_usec;\n  if (interactive_shell != 0) {\n    pSVar11 = find_variable(\"IGNOREEOF\");\n    if (((pSVar11 != (SHELL_VAR *)0x0) ||\n        (pSVar11 = find_variable(\"ignoreeof\"), pSVar11 != (SHELL_VAR *)0x0)) &&\n       ((pSVar11->attributes & 0x8000) != 0)) {\n      sv_ignoreeof(pSVar11->name);\n    }\n    if ((interactive_shell != 0) && (remember_on_history != 0)) {\n      sv_history_control(\"HISTCONTROL\");\n      setup_history_ignore(\"HISTIGNORE\");\n      pSVar11 = find_variable(\"HISTTIMEFORMAT\");\n      if ((pSVar11 != (SHELL_VAR *)0x0) && (history_comment_char == '\\0')) {\n        history_comment_char = '#';\n      }\n      history_write_timestamps = (int)(pSVar11 != (SHELL_VAR *)0x0);\n    }\n  }\n  pcVar18 = inttostr((ulong)current_user.uid,d,0xb);\n  pSVar11 = find_variable(\"UID\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = bind_variable(\"UID\",pcVar18,0);\n    pSVar11->attributes = pSVar11->attributes | 0x12;\n  }\n  if (current_user.euid != current_user.uid) {\n    pcVar18 = inttostr((ulong)current_user.euid,d,0xb);\n  }\n  pSVar11 = find_variable(\"EUID\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = bind_variable(\"EUID\",pcVar18,0);\n    pSVar11->attributes = pSVar11->attributes | 0x12;\n  }\n  pSVar11 = find_variable(\"BASH_XTRACEFD\");\n  if ((pSVar11 != (SHELL_VAR *)0x0) && ((pSVar11->attributes & 0x8000) != 0)) {\n    sv_xtracefd(pSVar11->name);\n  }\n  pSVar11 = find_variable(\"SECONDS\");\n  if (pSVar11 != (SHELL_VAR *)0x0) {\n    iVar7 = legal_number(pSVar11->value,&seconds_value_assigned);\n    if (iVar7 == 0) {\n      seconds_value_assigned = 0;\n    }\n    pSVar11 = (SHELL_VAR *)pSVar11->value;\n  }\n  pSVar11 = bind_variable(\"SECONDS\",(char *)pSVar11,0);\n  pSVar11->dynamic_value = get_seconds;\n  pSVar11->assign_func = assign_seconds;\n  pSVar11 = bind_variable(\"BASH_COMMAND\",(char *)0x0,0);\n  pSVar11->dynamic_value = get_bash_command;\n  pSVar11->assign_func = (sh_var_assign_func_t *)0x0;\n  pSVar11 = bind_variable(\"BASH_SUBSHELL\",(char *)0x0,0);\n  pSVar11->dynamic_value = get_subshell;\n  pSVar11->assign_func = assign_subshell;\n  pSVar11 = bind_variable(\"RANDOM\",(char *)0x0,0);\n  pSVar11->attributes = pSVar11->attributes | 0x10;\n  pSVar11->dynamic_value = get_random;\n  pSVar11->assign_func = assign_random;\n  pSVar11 = bind_variable(\"LINENO\",(char *)0x0,0);\n  pSVar11->attributes = pSVar11->attributes | 0x10;\n  pSVar11->dynamic_value = get_lineno;\n  pSVar11->assign_func = assign_lineno;\n  pSVar11 = bind_variable(\"BASHPID\",(char *)0x0,0);\n  pSVar11->attributes = pSVar11->attributes | 0x12;\n  pSVar11->dynamic_value = get_bashpid;\n  pSVar11->assign_func = null_assign;\n  pSVar11 = bind_variable(\"HISTCMD\",(char *)0x0,0);\n  pSVar11->attributes = pSVar11->attributes | 0x10;\n  pSVar11->dynamic_value = get_histcmd;\n  pSVar11->assign_func = (sh_var_assign_func_t *)0x0;\n  pSVar11 = bind_variable(\"COMP_WORDBREAKS\",(char *)0x0,0);\n  pSVar11->dynamic_value = get_comp_wordbreaks;\n  pSVar11->assign_func = assign_comp_wordbreaks;\n  pSVar11 = find_variable(\"DIRSTACK\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"DIRSTACK\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 4;\n    pSVar11->value = (char *)pAVar13;\n    pSVar11->dynamic_value = get_dirstack;\n    pSVar11->assign_func = assign_dirstack;\n  }\n  pSVar11 = find_variable(\"GROUPS\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"GROUPS\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x4004;\n    pSVar11->value = (char *)pAVar13;\n    puVar5 = PTR_null_array_assign_00208ec8;\n    pSVar11->dynamic_value = get_groupset;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar5;\n  }\n  pSVar11 = find_variable(\"BASH_ARGC\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_ARGC\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x6004;\n    pSVar11->value = (char *)pAVar13;\n    pSVar11->dynamic_value = get_self;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar4;\n  }\n  pSVar11 = find_variable(\"BASH_ARGV\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_ARGV\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x6004;\n    pSVar11->value = (char *)pAVar13;\n    pSVar11->dynamic_value = get_self;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar4;\n  }\n  pSVar11 = find_variable(\"BASH_SOURCE\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_SOURCE\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x6004;\n    pSVar11->value = (char *)pAVar13;\n    pSVar11->dynamic_value = get_self;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar4;\n  }\n  pSVar11 = find_variable(\"BASH_LINENO\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_LINENO\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x6004;\n    pSVar11->value = (char *)pAVar13;\n    pSVar11->dynamic_value = get_self;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar4;\n  }\n  pSVar11 = find_variable(\"BASH_CMDS\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_CMDS\",global_variables->table);\n    pHVar15 = hash_create(0);\n    pSVar11->attributes = pSVar11->attributes | 0x20040;\n    pSVar11->value = (char *)pHVar15;\n    pSVar11->dynamic_value = get_hashcmd;\n    pSVar11->assign_func = assign_hashcmd;\n  }\n  pSVar11 = find_variable(\"BASH_ALIASES\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"BASH_ALIASES\",global_variables->table);\n    pHVar15 = hash_create(0);\n    pSVar11->attributes = pSVar11->attributes | 0x20040;\n    pSVar11->value = (char *)pHVar15;\n    pSVar11->dynamic_value = get_aliasvar;\n    pSVar11->assign_func = assign_aliasvar;\n  }\n  pSVar11 = find_variable(\"FUNCNAME\");\n  if (pSVar11 == (SHELL_VAR *)0x0) {\n    pSVar11 = make_new_variable(\"FUNCNAME\",global_variables->table);\n    pAVar13 = array_create();\n    pSVar11->attributes = pSVar11->attributes | 0x5004;\n    pSVar11->value = (char *)pAVar13;\n    puVar4 = PTR_null_array_assign_00208ec8;\n    pSVar11->dynamic_value = get_funcname;\n    pSVar11->assign_func = (sh_var_assign_func_t *)puVar4;\n  }\n  if (lVar3 == *(long *)(in_FS_OFFSET + 0x28)) {\n    return;\n  }\n                    /* WARNING: Subroutine does not return */\n  __stack_chk_fail();\nLAB_00150290:\n  if (cVar2 != '=') goto LAB_00150299;\n  iVar7 = (int)pcVar18 - (int)pcVar12;\n  iVar19 = iVar7 + -1;\n  if (iVar19 != 0) {\n    pcVar1 = pcVar12 + iVar19;\n    *pcVar1 = '\\0';\n    if (((privmode == 0 && read_but_dont_execute == 0) && (*pcVar18 == '(')) &&\n       (iVar9 = strncmp(\"() {\",pcVar18,4), iVar9 == 0)) {\n      sVar16 = strlen(pcVar18);\n      __dest = (char *)sh_xmalloc((long)(iVar7 + 2 + (int)sVar16),\"variables.c\",0x163);\n      strcpy(__dest,pcVar12);\n      __dest[iVar19] = ' ';\n      strcpy(__dest + (long)iVar19 + 1,pcVar18);\n      iVar7 = legal_identifier(pcVar12);\n      if (iVar7 != 0) {\n        parse_and_execute(__dest,pcVar12,0x185);\n      }\n      pHVar15 = shell_functions;\n      pBVar14 = hash_search(pcVar12,shell_functions,0);\n      if (pBVar14 != (BUCKET_CONTENTS *)0x0) {\n        pSVar11 = (SHELL_VAR *)pBVar14->data;\n        last_table_searched = pHVar15;\n        if (pSVar11 != (SHELL_VAR *)0x0) {\n          pSVar11->attributes = pSVar11->attributes | 0x8001;\n          array_needs_making = 1;\n          goto LAB_00150a5d;\n        }\n      }\n      pSVar11 = bind_variable(pcVar12,pcVar18,0);\n      if (pSVar11 == (SHELL_VAR *)0x0) {\n        last_command_exit_value = L'\\x01';\n        pcVar18 = (char *)dcgettext(0,\"error importing function definition for `%s\\'\",5);\n        report_error(pcVar18,pcVar12);\n        goto LAB_00150ae0;\n      }\n      pSVar11->attributes = pSVar11->attributes | 0x9001;\n      array_needs_making = 1;\n      last_command_exit_value = L'\\x01';\n      pcVar18 = (char *)dcgettext(0,\"error importing function definition for `%s\\'\",5);\n      report_error(pcVar18,pcVar12);\n    }\n    else {\n      if (((posixly_correct == 0) || (*pcVar12 != 'S')) ||\n         ((iVar7 = strcmp(pcVar12,\"SHELLOPTS\"), iVar7 != 0 ||\n          (pSVar11 = find_variable(\"SHELLOPTS\"), pSVar11 == (SHELL_VAR *)0x0)))) {\n        uVar10 = 0;\n      }\n      else {\n        uVar10 = pSVar11->attributes;\n        pSVar11->attributes = uVar10 & 0xfffffffd;\n        uVar10 = uVar10 >> 1 & 1;\n      }\n      pSVar11 = bind_variable(pcVar12,pcVar18,0);\n      if (pSVar11 == (SHELL_VAR *)0x0) {\nLAB_00150ae0:\n        *pcVar1 = '=';\n        pcVar18 = *ppcVar20;\n        goto joined_r0x00150aef;\n      }\n      iVar7 = legal_identifier(pcVar12);\n      if (iVar7 == 0) {\n        uVar8 = pSVar11->attributes | 0x9001;\n      }\n      else {\n        uVar8 = pSVar11->attributes | 0x8001;\n      }\n      array_needs_making = 1;\n      pSVar11->attributes = uVar10 * 2 | uVar8;\n    }\nLAB_00150a5d:\n    *pcVar1 = '=';\n    if ((pSVar11->attributes & 8) == 0) goto code_r0x00150a6d;\n  }\nLAB_001502a4:\n  pcVar18 = *ppcVar20;\njoined_r0x00150aef:\n  ppcVar20 = ppcVar20 + 1;\n  pcVar12 = pcVar18;\n  if (pcVar18 == (char *)0x0) goto LAB_001502b1;\n  goto LAB_00150299;\ncode_r0x00150a6d:\n  sVar16 = strlen(pcVar12);\n  pcVar18 = (char *)sh_xmalloc(sVar16 + 1,\"variables.c\",0x1ad);\n  pcVar18 = strcpy(pcVar18,pcVar12);\n  pSVar11->exportstr = pcVar18;\n  pcVar18 = *ppcVar20;\n  ppcVar20 = ppcVar20 + 1;\n  goto joined_r0x0015027f;\n}\n\n"
  }
]
  • Vulnerable to environment function importing ("Shellshock"): parses env vars of form VAR=() { ... };, uses parse_and_execute unsafely, enabling code injection.
  • Multiple unchecked calls to strcpy (pcVar12, __dest, and others) on env-provided/user-derived input, risking buffer overflows if input is not properly validated.
  • Insufficient validation/length checks in other variables copied from environment may permit exploitation in crafted configurations.

Explain how the Shellshock might happen

Dr.Binary
  • Environment variables in the form VAR=() { :; }; <malicious-code> are passed to Bash.
  • initialize_shell_variables detects () and {, then calls parse_and_execute on the function definition.
  • The trailing <malicious-code> executes immediately as arbitrary commands due to improper separation and validation, enabling remote code execution.