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Adobe Download Manager AOM Stack Buffer Overflow
------------------------------------------------------------------------
SUMMARY
eEye Digital Security has discovered a stack buffer overflow in Adobe
Download Manager, a utility typically installed for the purpose of
downloading Adobe software such as Adobe (Acrobat) Reader. By opening a
malicious AOM file, a user's system may be compromised by arbitrary code
within the file, which executes with the privileges of that user.
DETAILS
Vulnerable Systems:
* Adobe Download Manager versions 2.1.x and earlier
A web-based attack conducted through Internet Explorer may succeed without
the use of ActiveX or scripting, and without any additional user
interaction other than viewing a web page, if the web server indicates a
Content-Type of "application/aom" when serving up the malicious AOM file.
In such a case, an ".aom" file extension is not required.
AdobeDownloadManager.exe is responsible for extracting download
instructions from AOM files, which are essentially XML with an appended
CRC32 in decimal, and committing the instructions to the file
"%APPDATA%\dm.ini" for later processing. For instance, opening the
following AOM file:
<?aom encoding="UTF-8"?>
<AdobeDownloadManager>
</AOM>
<DownloadRecord>
<url>WelcomeToMyHumbleAdobe</url>
</DownloadRecord>
</AOM>
</AdobeDownloadManager>3871966612
Will generate the following lines in "dm.ini":
[STARTUP]
Status=IncompleteDownload
[WelcomeToMyHumbleAdobe]
StoreID=0
TransactionID=0
When launched, whether or not it is supplied with an AOM file,
AdobeDownloadManager.exe reads the entries from "dm.ini" and handles each
described download according to its properties. It begins by reading a
list of section names into a 400h-byte buffer using
GetPrivateProfileStringA, then copies each section name into a 108h-byte
stack buffer using strncpy with a length limit equal to the length of the
section name string. The result is a relatively straightforward stack
buffer overflow, with the only complication being the character
restrictions.
It should be possible to uninstall Adobe Download Manager, or at least
unassociate the AOM file extension and "application/aom" Content-Type in
the registry, to defend against this vulnerability. Hopefully users who
have been forced to install Adobe Download Manager realized its
superfluousness and have already uninstalled it.
Vendor Status:
Adobe has released a patch for this vulnerability which is available at:
<http://www.adobe.com/products/acrobat/acrrmanager.html>
http://www.adobe.com/products/acrobat/acrrmanager.html.
The vendor bulletin is available at:
<http://www.adobe.com/support/security/bulletins/apsb06-19.html.>
http://www.adobe.com/support/security/bulletins/apsb06-19.html.
ADDITIONAL INFORMATION
The information has been provided by eEye.
The original article can be found at:
<http://research.eeye.com/html/advisories/published/AD20061205.html>
http://research.eeye.com/html/advisories/published/AD20061205.html
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