ChatZilla 'irc://' Server Name Buffer Overflow Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1008301
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Nov 26 2003
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Impact: Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Exploit Included: Yes
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Version(s): 0.9.35
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Description: A buffer overflow vulnerability was reported in ChatZilla. A remote user can execute arbitrary code on the target user's system.
dr_insane reported that ChatZilla does not validate the length of a server name. A remote user can generate an 'irc://' URL containg
a specially crafted server name of greater than 40 kB in length that, when loaded by the target user, will trigger the buffer overflow.
An exploit URL can be of the following form:
irc://[40kb long string]
It is also reported that there is a buffer overflow
in the processing of the /Nick command. A local user can type a specially crafted /Nick command to cause the system to crash.
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Impact: A remote user can create a URL that, when loaded by the target user, will cause arbitrary code to be executed on the target user's system.
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Solution: The author reports that version 0.9.45 is not vulnerable.
[Editor's note: The Revision History at http://www.hacksrus.com/~ginda/chatzilla/revs.html makes no mention of these flaws.]
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Vendor URL: www.mozilla.org/projects/rt-messaging/chatzilla/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Underlying OS Comments: Tested on Windows and Mac OS
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Reported By: dr_insane@pathfinder.gr
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Message History:
None.
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Source Message Contents
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Date: Tue, 25 Nov 2003 14:09:22 +0200
From: "=?windows-1253?B?w+nc7e3n8iDQ7+z+7efy?=" <dr_insane@pathfinder.gr>
Subject: [0day] dr_insane||Chatzilla 0.9.35 Multiple Bugs
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Security :: Advisory - Chatzilla 0.9.35 Multpiple buffer overflows
Vulnerable
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Chatzilla 0.9.35 and all tested prior versions. Last version doesn't seem vulnerable.
Affected systems:
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Windows(all versions)
Mac OS
Impact
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High. These buffer overflows allow arbitary code to be executed on the victim's machine.
Details
--------
Chatzilla is an Irc client that comes by default with every version of Mozilla browser for Windows an
d
Mac OS. The problem is tha chatzilla doesn't not check the length of characters for a server to conne
ct.Sending a
server name fot chatzilla to connect over 40kb long allows overwriting of a key variable.
There is also another buffer overflow in the /Nick command. Sending again about 40kb will crash the s
ystem.
Demonstration(1):
--------------
Type in mozilla browser:
irc://[40kb long string]. (hmm! this looks like the bug in Mirc.)
//[crash]//
info(1):
-----
(0x00000EE4)
(0xC00000FD)
3140 (0x00000C44)
3092 (0x00000C14)
328 (0x00000148)
924 (0x0000039C)
3084 (0x00000C0C)
576 (0x00000240)
3284 (0x00000CD4)
2792 (0x00000AE8)
452 (0x000001C4)
3312 (0x00000CF0)
3160 (0x00000C58)
3384 (0x00000D38)
600 (0x00000258)
[ 0] 54 49 07 61 14 30 03 00 DE 49 07 61 34 30 03 00 [TI.a.0...I.a40..]
[ 10] DE 49 07 61 54 30 03 00 DE 49 07 61 74 30 03 00 [.I.aT0...I.at0..]
[ 20] DE 49 07 61 94 30 03 00 DE 49 07 61 B4 30 03 00 [.I.a.0...I.a.0..]
[ 30] DE 49 07 61 D4 30 03 00 DE 49 07 61 F4 30 03 00 [.I.a.0...I.a.0..]
[ 40] DE 49 07 61 14 31 03 00 DE 49 07 61 34 31 03 00 [.I.a.1...I.a41..]
[ 50] DE 49 07 61 54 31 03 00 DE 49 07 61 74 31 03 00 [.I.aT1...I.at1..]
[ 60] DE 49 07 61 94 31 03 00 DE 49 07 61 B4 31 03 00 [.I.a.1...I.a.1..]
[ 70] DE 49 07 61 D4 31 03 00 DE 49 07 61 F4 31 03 00 [.I.a.1...I.a.1..]
Demostration(2):
----------------
Open chatzilla and type:
/nick [40kb long nick]
//[crash]//
pr00f of concept exploit:
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Get it on: http://members.lycos.co.uk/r34ct/
Solution:
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Upgrade to chatzilla 0.9.45
credit:
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dr_insane@pathfinder.gr
http://members.lycos.co.uk/r34ct/
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