PrÃbujÄ uaktualniÄ do 6.1.8-9, ale napotkaÅem bÅÄd budowania:
ImageMagick-6.1.8/coders/fpx.c:
977: if (fpx_info.numberOfComponents == 1)
(void) ImportQuantumPixels(image,GrayQuantum,pixels);
else
if (image->matte == MagickFalse)
(void) ImportQuantumPixels(image,RGBQuantum,0,pixels);
else
(void) ImportQuantumPixels(image,RGBAQuantum,0,pixels);
fpx_status=FPX_WriteImageLine(flashpix,&fpx_info);W 978 brak jednego argumentu dla funkcji ImportQuantumPixels. Czy ktoÅ moÅe potwierdziÄ, Åe tam powinno byÄ 0?
Pozdr, Radek
-------- WiadomoÅÄ oryginalna --------
Temat: iDEFENSE Security Advisory 01.17.05: Multiple Vendor ImageMagick .psd Image File Decode Heap Overflow Vulnerability
Data: Mon, 17 Jan 2005 13:27:23 -0500
Nadawca: customer service mailbox <[EMAIL PROTECTED]>
Adresat: <[email protected]>, <[EMAIL PROTECTED]>
Multiple Vendor ImageMagick .psd Image File Decode Heap Overflow Vulnerability
iDEFENSE Security Advisory 01.17.05 www.idefense.com/application/poi/display?id=184&type=vulnerabilities January 17, 2005
I. BACKGROUND
ImageMagick provides a variety of graphics image-handling libraries and capabilities. These libraries are widely used and are shipped by default
on most Unix and Linux distributions. These libraries are commonly installed by default on computers where any other graphical image viewer
or X Desktop environment is installed (such as Gnome or KDE).
More information is available at the following site:
http://www.imagemagick.org
II. DESCRIPTION
Remote exploitation of a buffer overflow vulnerability in The ImageMagick's Project's ImageMagick PSD image-decoding module could allow an attacker to execute arbitrary code.
A heap overflow exists within ImageMagick, specifically in the decoding of Photoshop Document (PSD) files. The vulnerable code follows:
ImageMagick-6.1.0/coders/psd.c
for (j=0; j < (long) layer_info[i].channels; j++) { layer_info[i].channel_info[j].type=(short)ReadBlobMSBShort(image);
layer_info[i].channel_info[j].size=ReadBlobMSBLong(image);
[...]
}
The array channel_info is only 24 elements large, and the loop variable,
"j", is bounded by a user-supplied value from the image file, thus allowing a heap overflow to occur when more than 24 layers are specified. If heap structures are overflowed in a controlled way, execution of arbitrary code is possible.
III. ANALYSIS
Exploitation may allow attackers to run arbitrary code on a victim's computer if the victim opens a specially formatted image. Such images could be delivered by e-mail or HTML, in some cases, and would likely not raise suspicion on the victim's part. Exploitation is also possible when a web-based application uses ImageMagick to process user-uploaded image files.
IV. DETECTION
iDEFENSE has confirmed this vulnerability in ImageMagick 6.1.0 and ImageMagick 6.1.7. Earlier versions are also suspected vulnerable.
The following vendors may include vulnerable ImageMagick packages:
The Debian Project MandrakeSoft Red Hat, Inc.
V. WORKAROUND
Do not open files from untrusted sources. Do not allow untrusted sources
to process images using your web application.
VI. VENDOR RESPONSE
This vulnerability is addressed in ImageMagick 6.1.8-8, available for download at:
http://www.imagemagick.org/www/download.html
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the names CAN-2005-0005 to these issues. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.
VIII. DISCLOSURE TIMELINE
12/21/2004 Initial vendor notification 01/14/2004 Initial vendor response 01/17/2005 Public disclosure
IX. CREDIT
Andrei Nigmatulin is credited with this discovery.
Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp
X. LEGAL NOTICES
Copyright (c) 2004 iDEFENSE, Inc.
Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email [EMAIL PROTECTED] for permission.
Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
-- RadosÅaw Kintzi (radek/at/rakin.eu.org)
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